SP3T Diversity Antenna switch with GPIO Interface

SP3T Diversity Antenna switch with GPIO Interface
AN478
SP3T Diversity Antenna Switch with GPIO
Interface
BGS13GA14
About this document
Scope and purpose
This application note describes Infineon’s SP3T Diversity Antenna Switch with GPIO Interface: BGS13GA14 as
switch for Mobile phones in different RF FE applications such as diversity or band selection switch.
1. This application note documents the behavior of BGS13GA14 for different LTE bands (Band 1, 2, 5, 7
and Band 13).
2. The BGS13GA14 is used in this document.
3. General purpose wideband RF switch for diversity application or band selection switch.
4.
Key Parameters:
3 high-linearity TRx paths with power handling capability of up to 30 dBm
Low insertion loss
Low harmonic generation
High port-to-port-isolation
Suitable for Edge / CDMA2000 / LTE / WCDMA applications
BGS13GA14 is part of the family BGS1xGA14:
- BGS13GA14: Single Pole Three Throw
- BGS14GA14: Single Pole Four Throw
- BGS15GA14: Single Pole Five Throw
- BGS16GA14: Single Pole Six Throw
- BGS17GA14: Single Pole Seven Throw
- BGS18GA14: Single Pole Eight Throw
Application Note
www.infineon.com
Revision 1.2
2016-06-07
SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Table
of Contents
BGS13GA14
Table of Contents
About this document....................................................................................................................... 1
Table of Contents ........................................................................................................................... 2
List of Figures1................................................................................................................................ 3
List of Tables .................................................................................................................................. 4
1
Introduction.................................................................................................................. 5
2
2.1
2.2
2.3
BGS13GA14 Features ...................................................................................................... 8
Main Features .......................................................................................................................................... 8
Functional Diagram ................................................................................................................................. 8
Signal Description ................................................................................................................................... 9
3
3.1
3.2
3.3
3.4
3.5
Application Circuit and Performance Overview ................................................................ 11
Summary of Measurement Results....................................................................................................... 11
Insertion Loss ........................................................................................................................................ 12
Antenna Return Loss ............................................................................................................................. 13
Port Return Loss .................................................................................................................................... 14
Isolation Port to Port............................................................................................................................. 16
4
4.1
4.2
4.3
Switching time ............................................................................................................. 19
Measurement Specifications ................................................................................................................ 19
Measurement Setup .............................................................................................................................. 20
Measurement results............................................................................................................................. 20
5
5.1
5.2
5.3
Intermodulation ........................................................................................................... 22
Test conditions ...................................................................................................................................... 23
Measurement Setup .............................................................................................................................. 24
Measurement Results ............................................................................................................................ 25
6
6.1
6.2
6.2.1
6.2.2
6.2.3
6.2.4
6.2.5
Harmonic Generation .................................................................................................... 35
Measurement Setup .............................................................................................................................. 35
Measurement results............................................................................................................................. 36
Harmonics for Band 1 ...................................................................................................................... 36
Harmonics for Band 2 ...................................................................................................................... 37
Harmonics for Band 5 ...................................................................................................................... 38
Harmonics for Band 7 ...................................................................................................................... 39
Harmonics for Band 13 .................................................................................................................... 40
7
7.1
7.2
Evaluation Board and Layout Information ....................................................................... 41
Evaluation Board ................................................................................................................................... 41
Measurement description and deembedding ...................................................................................... 42
8
Authors........................................................................................................................ 43
Application Note
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SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
List
of Figures
BGS13GA14
List of Figures1
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Figure 12
Figure 13
Figure 14
Figure 15
Figure 16
Figure 17
Figure 18
Figure 19
Figure 20
Figure 21
Figure 22
Figure 23
Figure 24
Figure 25
Figure 26
Figure 27
Figure 28
Figure 29
Figure 30
Figure 31
Figure 32
Figure 33
Figure 34
Figure 35
Figure 36
Figure 37
Figure 38
Figure 39
Figure 40
Figure 41
Figure 42
Excample of TD-LTE band for diversity path ...................................................................................... 5
BGS13GA14 .......................................................................................................................................... 8
Equivalent Circuit Block diagram of BGS13GA14 ............................................................................... 8
Package and pin connections (top view) of BGS13GA14 ................................................................. 10
Insertion Loss in dB up to 6GHz ........................................................................................................ 12
RF matching @ Ant Port in dB........................................................................................................... 13
RF matching @ RFx Ports in dB......................................................................................................... 14
Isolation Antenna to Port in dB ........................................................................................................ 15
Isolation Port to Port with RF1 active in dB ..................................................................................... 16
Isolation Port to Port with RF2 active in dB ..................................................................................... 17
Isolation Port to Port with RF3 active in dB ..................................................................................... 18
Switching Time .................................................................................................................................. 19
Rise/Fall Time .................................................................................................................................... 19
Measurement setup .......................................................................................................................... 20
Screenshots of switching times ........................................................................................................ 21
Representation of IMD products ....................................................................................................... 22
Block diagram of RF Switch intermodulation .................................................................................. 23
Block diagram of RF Switch intermodulation .................................................................................. 24
IMD products of Band 1 LTE and Pin=21dBm................................................................................... 25
IMD products of Band 1 LTE and Pin=10dBm................................................................................... 26
IMD products of Band 2 LTE and Pin=21dBm................................................................................... 27
IMD products of Band 2 LTE and Pin=10dBm................................................................................... 28
IMD products of Band 5 LTE and Pin=21dBm................................................................................... 29
IMD products of Band 5 LTE and Pin=10dBm................................................................................... 30
IMD products of Band 7 LTE and Pin=21dBm................................................................................... 31
IMD products of Band 7 LTE and Pin=10dBm................................................................................... 32
IMD products of Band 13 LTE and Pin=21dBm................................................................................. 33
IMD products of Band 13 LTE and Pin=10dBm................................................................................. 34
Setup for harmonics measurement.................................................................................................. 35
2nd harmonics at fc=1950MHz ........................................................................................................... 36
3rd harmonics at fc=1950MHz ............................................................................................................ 36
2nd harmonics at fc=1880MHz ........................................................................................................... 37
3rd harmonics at fc=1880MHz ............................................................................................................ 37
2nd harmonics at fc=836,5MHz .......................................................................................................... 38
3rd harmonics at fc=836,5MHz ........................................................................................................... 38
2nd harmonics at fc=2535MHz ........................................................................................................... 39
3rd harmonics at fc=2535MHz ............................................................................................................ 39
2nd harmonics at fc=782MHz ............................................................................................................. 40
3rd harmonics at fc=782MHz .............................................................................................................. 40
BGS13GA14 Application Board and deembedding kit ..................................................................... 41
PCB cross-section of the evaluation board for BGS13GA14 ............................................................ 41
SMA connector for deembeding procedure ..................................................................................... 42
Application Note
3
Revision 1.2
2016-06-07
SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
List
of Tables
BGS13GA14
List of Tables
Table 1
Table 2
Table 3
Table 4
Table 5
Table 6
Table 7
Table 8
Table 9
Table 10
Table 11
Table 12
Table 13
Table 14
Table 15
Table 16
Table 17
Table 18
Table 19
Table 20
Table 21
Table 22
Overview LTE Bands ............................................................................................................................ 6
Pin Configuration of BGS13GA14 ....................................................................................................... 9
Modes of Operation: Truth Table of BGS13GA14 ............................................................................... 9
Forward Transmission in dB ............................................................................................................. 12
Antenna Return Loss in dB ................................................................................................................ 13
Port Return Loss in dB....................................................................................................................... 14
Isolation Antenna to Port in dB ........................................................................................................ 15
Isolation Port to Port with RF1 active in dB ..................................................................................... 16
Isolation Port to Port with RF2 active in dB ..................................................................................... 17
Isolation Port to Port with RF3 active in dB ..................................................................................... 18
IMD Mathematical definitions ........................................................................................................... 22
IMD Mathematical definitions extended .......................................................................................... 23
IMD products of Band 1 LTE .............................................................................................................. 25
IMD products of Band 1 LTE .............................................................................................................. 26
IMD products of Band 2 LTE .............................................................................................................. 27
IMD products of Band 2 LTE .............................................................................................................. 28
IMD products of Band 5 LTE .............................................................................................................. 29
IMD products of Band 5 LTE .............................................................................................................. 30
IMD products of Band 7 LTE .............................................................................................................. 31
IMD products of Band 7 LTE .............................................................................................................. 32
IMD products of Band 13 LTE ............................................................................................................ 33
IMD products of Band 13 LTE ............................................................................................................ 34
1) The graphs are generated with the simulation program AWR Microwave Office®.
Application Note
4
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SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Introduction
BGS13GA14
1
Introduction
Infineon’s RF CMOS switches are the first on the market to be based purely on standard industrial CMOS
processes that offer low insertion loss, high isolation and low harmonics generation for high-volume
production. They are widely used for band selection/switching or diversity switching at the antenna or different
RF paths within the RF Front-End (FE).
The BGS13GA14 RF MOS switch is specifically designed for cell phone and mobile applications. Any of the 3
ports can be used as termination of the diversity antenna handling up to 30 dBm.
This SP3T offers low insertion loss and high robustness against interferer signals at the antenna port and low
harmonic generation in termination mode. The on-chip controller integrates CMOS logic and level shifters,
driven by control inputs from 1.35 V to VDD. The BGS13GA14 RF Switch is manufactured in Infineon’s patented
MOS technology, offering the performance of GaAs with the economy and integration of conventional CMOS
including the inherent higher ESD robustness. The device has a very small size of only 2x2 mm² and a maximum
height of 0.6 mm.
The recent trend of smartphone and tablet users to download more and more data anytime and anywhere
increases the demand for more bandwidth and for an additional receiver channel called the diversity path. To
select the right receive band, a diversity switch with low insertion loss and excellent RF performance is one
method of choice. Nowadays, diversity switches covering up to 7 or more different UMTS/LTE bands are
becoming more and more popular in smartphones and tablets (Overview LTE Bands).
LTE LNA
B38 SAW
PCB Trace
Diversity
Switch
B39 SAW
Diversity
Antenna
Application Note
B39 SAW
RF IC
Diplexer
Figure 1
B38 SAW
B40 SAW
B40 SAW
Excample of TD-LTE band for diversity path
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SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Introduction
BGS13GA14
Table 1
Overview LTE Bands
Band No.
Band
Definition
Uplink Frequency
Range
Downlink Frequency
Range
FDD/TDD
System
1
Mid-Band
1920-1980 MHz
2110-2170 MHz
FDD
2
Mid-Band
1850-1910 MHz
1930-1990 MHz
FDD
3
Mid-Band
1710-1785 MHz
1805-1880 MHz
FDD
4
Mid-Band
1710-1755 MHz
2110-2155 MHz
FDD
5
Low-Band
824-849 MHz
869-894 MHz
FDD
6
Low-Band
830-840 MHz
875-885 MHz
FDD
7
High-Band
2500-2570 MHz
2620-2690 MHz
FDD
8
Low-Band
880-915 MHz
925-960 MHz
FDD
9
Mid-Band
1749.9-1784.9 MHz
1844.9-1879.9 MHz
FDD
10
Mid-Band
1710-1770 MHz
2110-2170 MHz
FDD
11
Mid-Band
1427.9-1452.9 MHz
1475.9-1500.9 MHz
FDD
12
Low-Band
698-716 MHz
728-746 MHz
FDD
13
Low-Band
777-787 MHz
746-756 MHz
FDD
14
Low-Band
788-798 MHz
758-768 MHz
FDD
15
reserved
reserved
FDD
16
reserved
Reserved
FDD
17
Low-Band
704-716 MHz
734-746 MHz
FDD
18
Low-Band
815-830 MHz
860-875 MHz
FDD
19
Low-Band
830-845 MHz
875-890 MHz
FDD
20
Low-Band
832-862 MHz
791-821 MHz
FDD
21
Mid-Band
1447.9-1462.9 MHz
1495.9-1510.9 MHz
FDD
22
High-Band
3410-3500 MHz
3510-3600 MHz
FDD
23
Mid-Band
2000-2020 MHz
2180-2200 MHz
FDD
24
Mid-Band
1626.5-1660.5 MHz
1525-1559 MHz
FDD
25
Mid-Band
1850-1915 MHz
1930-1995 MHz
FDD
26
Low-Band
814-849 MHz
859-894 MHz
FDD
27
Low-Band
807-824 MHz
852-869 MHz
FDD
28
Low-Band
703-748 MHz
758-803 MHz
FDD
29
Low-Band
N/A
716-728 MHz
FDD
30
High-Band
2305-2315 MHz
2350-2360 MHz
FDD
31
Low-Band
452.5-457.5 MHz
462.5-467.5MHz
FDD
32
Mid-Band
N/A
1452-1496 MHz
FDD
33
Mid-Band
1900-1920 MHz
TDD
34
Mid-Band
2010-2025 MHz
TDD
35
Mid-Band
1850-1910 MHz
TDD
36
Mid-Band
1930-1990 MHz
TDD
37
Mid-Band
1910-1930 MHz
TDD
Application Note
6
Comment
Revision 1.2
2016-06-07
SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Introduction
BGS13GA14
Table 1
Overview LTE Bands
38
High-Band
2570-2620 MHz
TDD
39
Mid-Band
1880-1920 MHz
TDD
40
High-Band
2300-2400 MHz
TDD
41
High-Band
2496-2690 MHz
TDD
42
High-Band
3400-3600 MHz
TDD
43
High-Band
3600-3800 MHz
TDD
44
Low-Band
TDD
46
High-Band
703-803 MHz
5150-5925 MHz
TDD
Note: FDD: Frequency Division Duplexing; TDD: Time Division Duplexing
Application Note
7
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SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
BGS13GA14
BGS13GA14Features
2
BGS13GA14 Features
2.1
Main Features

3 high-linearity, interchangeable RX ports

Low insertion loss

Low harmonic generation

High port-to-port-isolation

Suitable for Edge / C2K / LTE / WCDMA Applications

0.1 to 6 GHz coverage

No decoupling capacitors required if no DC applied on RF
lines

On chip control logic including ESD protection

General Purpose Input-Output (GPIO) Interface

Small form factor 2.0mm x 2.0mm

No power supply blocking required

High EMI robustness

RoHS and WEEE compliant package
2.2
Functional Diagram
Figure 3
Equivalent Circuit Block diagram of BGS13GA14
Application Note
8
Figure 2
BGS13GA14
Revision 1.2
2016-06-07
SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
BGS13GA14
BGS13GA14Features
2.3
Signal Description
Pin Configuration of BGS13GA14
Table 2
Pin No.
Name
Pin Type
Function
0
GND
GND
RF Ground; die pad
1
NC
2
RX3
I/O
RX port 3
3
RX1
I/O
RX port 1
4
VDD
PWR
VDD supply
5
V3
I
GPIO control pin
6
V2
I
GPIO control pin
7
V1
I
GPIO control pin
8
NC
9
RX2
10
NC
Not connected
11
NC
Not connected
12
NC
Not connected
13
ANT
14
NC
Not connected
Not connected
I/O
RX port 2
I/O
Antenna Port
Not connected
Modes of Operation: Truth Table of BGS13GA14
Table 3
Control Inputs
State
Mode
V1
V2
V3
1
RX1-ANT
0
0
0
2
RX2-ANT
0
0
1
3
RX3-ANT
0
1
0
4
Isolation
0
1
1
5
Isolation
1
0
0
6
50Ω
1
0
1
7
Isolation
1
1
0
8
Shutdown
1
1
1
Application Note
9
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SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
BGS13GA14
BGS13GA14Features
Figure 4
Package and pin connections (top view) of BGS13GA14
Application Note
10
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SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Application
BGS13GA14Circuit and Performance Overview
3
Application Circuit and Performance Overview
In this chapter the performance of the application circuit, the schematic and bill-on-materials are presented.
Device:
BGS13GA14
Application:
SP3T Diversity Antenna Switch with GPIO Interface
PCB Marking:
BGS1xGA14
3.1
Summary of Measurement Results
All measurement results of this application note are measured with a typical device of the BGS13GA14 on an
application board. The measurement procedure is shown in chapters Intermodulation, Harmonic Generation
and Evaluation Board and Layout Information including the needed de-embedding for s-Parameter
measurements.
The small signal characteristics are measured at 25 °C, -5 dBm Pin, 2.8V Vdd, 1.8V Vcrlt up to 6GHz with a Network
Analyzer connected to an automatic multiport switch box in single ended mode.
In the following tables and graphs the most important RF parameter of the BGS13GA14 are shown. The markers
are set to the most important frequencies of the WCDMA and LTE systems.
Application Note
11
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SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Application
BGS13GA14Circuit and Performance Overview
3.2
Insertion Loss
Insertion Loss
0
Insertion Loss (dB)
-2
0.698 GHz
-0.2983 dB
1.428 GHz
-0.3636 dB
-4
0.96 GHz
-0.3289 dB
-6
2.17 GHz
-0.3991 dB
1.99 GHz
-0.387 dB
3.4 GHz
-0.5065 dB
3.8 GHz
-0.5255 dB
3.6 GHz
-0.5146 dB
2.69 GHz
-0.4467 dB
RF1
-8
RF2
RF3
-10
0
1
Figure 5
Insertion Loss in dB up to 6GHz
Table 4
Forward Transmission in dB
Frequency
(MHz)
RF1
RF2
RF3
Application Note
2
Frequency (GHz)
3
4
698
960
1428
1990
2170
2690
3400
3600
3800
0.30
0.29
0.30
0.33
0.31
0.32
0.36
0.34
0.37
0.41
0.39
0.41
0.42
0.40
0.43
0.47
0.45
0.48
0.54
0.51
0.55
0.55
0.51
0.56
0.57
0.53
0.57
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SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Application
BGS13GA14Circuit and Performance Overview
3.3
Antenna Return Loss
Antenna Return Loss
0
Antenna Return Loss (dB)
1.99 GHz
-20.38 dB
-10
0.96 GHz
-23.47 dB
2.17 GHz
-20.27 dB
2.69 GHz
-17.99 dB
1.428 GHz
-22.06 dB
0.698 GHz
-25.53 dB
-20
3.4 GHz
-15.89 dB
-30
3.6 GHz
-15.78 dB
3.8 GHz
-15.89 dB
RF1
-40
RF2
RF3
-50
0
1
Figure 6
RF matching @ Ant Port in dB
Table 5
Antenna Return Loss in dB
Frequency
(MHz)
RF1
RF2
RF3
Application Note
2
Frequency (GHz)
3
4
698
960
1428
1990
2170
2690
3400
3600
3800
26.09
25.46
25.53
23.89
24.09
23.47
22.41
23.11
22.06
21.13
21.22
20.38
21.06
20.96
20.27
18.64
18.38
17.99
16.40
16.96
15.89
16.12
17.12
15.78
15.85
17.33
15.89
13
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SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Application
BGS13GA14Circuit and Performance Overview
3.4
Port Return Loss
Port Return Loss
-10
1.99 GHz
-26.26 dB
2.69 GHz
-22.66 dB
2.17 GHz
-26.17 dB
Port Return Loss (dB)
-20
-30
1.428 GHz
-26.17 dB
0.698 GHz
-28.09 dB
-40
3.4 GHz
-20.64 dB
3.6 GHz
-19.02 dB
0.96 GHz
-26.75 dB
3.8 GHz
-19.3 dB
RF1
-50
RF2
RF3
-60
0
Figure 7
1
2
Frequency (GHz)
3
4
RF matching @ RFx Ports in dB
Table 6
Frequency
(MHz)
RF1
RF2
RF3
Application Note
Port Return Loss in dB
698
960
1428
1990
2170
2690
3400
3600
3800
29.58
27.24
28.09
28.18
26.75
26.82
27.33
27.51
26.17
27.98
27.82
26.26
28.11
27.33
26.17
23.71
22.75
22.66
19.95
20.64
19.17
19.31
21.13
19.02
18.93
21.90
19.30
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SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Application
BGS13GA14Circuit and Performance Overview
Isolation Antenna to Port
Isolation Antenna to Port (dB)
0
1.99 GHz
-29.05 dB
1.428 GHz
-31.93 dB
-20
2.17 GHz
-28.37 dB
2.69 GHz
-26.77 dB
-40
-60
3.4 GHz
-25.06 dB
0.96 GHz
-35.41 dB
0.698 GHz
-38.01 dB
-80
3.6 GHz
-24.54 dB
3.8 GHz
-24.02 dB
RF1_act: RFin_RF2
RF2_act: RFin_RF3
RF1_act: RFin_RF3
RF3_act: RFin_RF1
RF2_act: RFin_RF1
RF3_act: RFin_RF2
-100
0
Figure 8
Table 7
1
2
Frequency (GHz)
3
4
Isolation Antenna to Port in dB
Isolation Antenna to Port in dB
Frequency
(MHz)
RF1_act:
RFin_RF2
RF1_act:
RFin_RF3
RF2_act:
RFin_RF1
RF2_act:
RFin_RF3
RF3_act:
RFin_RF1
RF3_act:
RFin_RF2
Application Note
698
960
1428
1990
2170
2690
3400
3600
3800
55.54
51.74
48.04
44.92
44.08
41.78
37.80
37.75
37.27
39.47
36.86
33.37
30.28
29.51
27.67
25.53
24.94
24.31
54.07
50.95
47.42
44.45
43.51
41.33
37.66
37.44
36.81
49.14
46.14
42.55
39.57
38.75
36.65
33.67
33.16
32.48
38.01
35.41
31.94
29.05
28.37
26.77
25.06
24.54
24.02
54.36
51.21
47.41
44.27
43.38
41.15
37.95
37.63
37.08
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SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Application
BGS13GA14Circuit and Performance Overview
3.5
Isolation Port to Port
Isolation RF1 Active
0
0.96 GHz
-34.44 dB
Isolation RF1 Active (dB)
1.99 GHz
-27.77 dB
1.428 GHz
-30.76 dB
2.17 GHz
-27.04 dB
2.69 GHz
-25.2 dB
-20
0.698 GHz
-37.11 dB
-40
-60
3.4 GHz
-23.22 dB
3.6 GHz
-22.73 dB
3.8 GHz
-22.23 dB
RF2_RF1
-80
RF3_RF1
RF3_RFin
RF2_RFin
-100
0
Figure 9
1
2
Frequency (GHz)
3
4
Isolation Port to Port with RF1 active in dB
Table 8
Frequency
(MHz)
RF2_RF1
RF3_RF1
RF3_RFin
RF2_RFin
Application Note
Isolation Port to Port with RF1 active in dB
698
960
1428
1990
2170
2690
3400
3600
3800
70.25
37.11
39.47
55.54
77.51
34.45
36.86
51.74
61.10
30.76
33.37
48.04
54.79
27.77
30.28
44.92
53.28
27.04
29.51
44.08
50.00
25.20
27.67
41.78
52.95
23.22
25.53
37.80
47.79
22.73
24.94
37.75
46.61
22.23
24.31
37.27
16
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SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Application
BGS13GA14Circuit and Performance Overview
Isolation RF2 Active
-20
1.428 GHz
-42.554 dB
Isolation RF2 Active (dB)
0.96 GHz
-46.14 dB
1.99 GHz
-39.573 dB
2.69 GHz
-36.646 dB
2.17 GHz
-38.748 dB
0.698 GHz
-49.139 dB
-40
3.4 GHz
-33.674 dB
-60
3.6 GHz
-33.159 dB
-80
3.8 GHz
-32.481 dB
RF1_RF2
RF3_RFin
RF3_RF2
RF1_RFin
-100
0
Figure 10
1
2
Frequency (GHz)
3
4
Isolation Port to Port with RF2 active in dB
Table 9
Frequency
(MHz)
RF1_RF2
RF3_RFin
RF3_RF2
RF1_RFin
Application Note
Isolation Port to Port with RF2 active in dB
698
960
1428
1990
2170
2690
3400
3600
3800
68.97
49.14
56.70
54.06
65.54
46.14
53.49
50.94
57.70
42.55
49.19
47.40
51.93
39.57
45.55
44.40
50.17
38.75
44.59
43.52
46.95
36.65
42.28
41.34
46.21
33.67
39.65
37.66
44.48
33.16
38.47
37.46
43.64
32.48
37.51
36.83
17
Revision 1.2
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SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Application
BGS13GA14Circuit and Performance Overview
Isolation RF3 Active
0
-20
Isolation RF3 Active (dB)
1.99 GHz
-26.6 dB
1.428 GHz
-29.57 dB
2.69 GHz
-24.13 dB
2.17 GHz
-25.91 dB
-40
-60
3.6 GHz
-21.74 dB
3.4 GHz
-22.21 dB
3.8 GHz
-21.31 dB
0.96 GHz
-33.18 dB
-80
RF3_RF1
0.698 GHz
-35.91 dB
-100
RF2_RFin
RF3_RF2
RF1_RFin
-120
0
Figure 11
1
2
Frequency (GHz)
3
4
Isolation Port to Port with RF3 active in dB
Table 10
Frequency
(MHz)
RF3_RF1
RF2_RFin
RF3_RF2
RF1_RFin
Application Note
Isolation Port to Port with RF3 active in dB
698
960
1428
1990
2170
2690
3400
3600
3800
35.91
54.39
76.56
38.01
33.18
51.18
72.06
35.41
29.57
47.42
61.49
31.94
26.60
44.26
55.33
29.05
25.91
43.35
53.71
28.37
24.13
41.13
50.53
26.77
22.21
37.94
48.54
25.06
21.74
37.62
46.16
24.54
21.31
37.09
44.84
24.02
18
Revision 1.2
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SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Switching
time
BGS13GA14
4
Switching time
4.1
Measurement Specifications
Switching On Time:
50% Trigger signal to 90 % RF Signal
Switching Off Time:
50% Trigger signal to 10% RF Signal
VCTRL
2
VCTRL
tON
90% RF signal
RF signal
tOFF
Figure 12
10% RF signal
Switching Time
Rise time: 10% to 90% RF Signal
Fall time: 90% to 10% RF Signal
90% RF signal
RF signal
10% RF signal
tOFF
tON
Figure 13
Rise/Fall Time
Application Note
19
Revision 1.2
2016-06-07
SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Switching
time
BGS13GA14
4.2
Measurement Setup
The setup on below is representing switching time measurement setup. In the Measurement setup the setup is
configured for a SPDT switch, where the trigger signal is a one kHz signal with the amplitude of device
Vdd/Vctrl. The setup properties (RFin and trigger signal pulse) could be changed for measuring other devices
like amplifier.
Oscilloscope
DUT
Vdd
Vctrl
Power Supply
Vdd=2,8V
50 Ohm
Signal Generator
f=1GHz
P=+10dBm
Figure 14
4.3
Measurement setup
Measurement results
The switching Time measurement setup consist of one pulse generator which generates a sqare wave with 50%
duty cycle and an amplitude of 1.8 Volts, an oscilloscope which can detect the 1 GHz signal and the 1 kHz signal
and one Signal generator which is set to an output signal of 1GHz with a power level 10 dBm.
If the oscilloscope can not detect the 1 GHz signal of the RF path, due to small bandwith, it is possible tu use a
cristal oscillator in front of the oscilloscope (such a device detects any RF signal present at input and
commutate that one) that the RF signal can be detected.
VDD=
Vctrl=
RFIn=
Spec
RF1
RF2
RF3
2.7V
0/1.8V
Pulsed with 600Hz 50%duty cicle
300MHz @ 0dBm
Application Note
20
Vctrl to RF
2 - 4 µs
2.695 µs
2.655 µs
2.683 µs
RF rise Time
2 µs
303.3 ns
313.3 ns
333.3 ns
Revision 1.2
2016-06-07
SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Switching
time
BGS13GA14
RF1
RF1
RF2
RF2
RF3
RF3
Switching On Time: 50% Trigger signal to 90 % RF
Signal
Figure 15
Rise time: 10% to 90% RF Signal
Screenshots of switching times
Application Note
21
Revision 1.2
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SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Intermodulation
BGS13GA14
5
Intermodulation
Intermodulation distortion is characterized by the appearance in the output of frequencies equal to the sums
and differences of integral multiples of the two or more component frequencies present in the input waveform.
Defined by the following expressions:
Table 11
IMD Mathematical definitions
Second Order IMD
𝑓𝐼𝑀𝐷2𝑙𝑜𝑤 = 𝑓𝑅𝑥 − 𝑓𝑇𝑥
Third Order IMD
𝑓𝐼𝑀𝐷3𝑙 = 2𝑓𝑇𝑥 − 𝑓𝑅𝑥
Figure 16
𝑓𝐼𝑀𝐷2ℎ𝑖𝑔ℎ = 𝑓𝑅𝑥 + 𝑓𝑇𝑥
𝑓𝐼𝑀𝐷3𝑚 = 2𝑓𝑅𝑥 + 𝑓𝑇𝑥
𝑓𝐼𝑀𝐷3ℎ = 𝑓𝑅𝑥 + 2𝑓𝑇𝑥
Representation of IMD products
Application Note
22
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SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Intermodulation
BGS13GA14
5.1
Test conditions
Developing the same mathematical expressions we can see that external signals matching IMDs frequencies
can interfere over 𝑓𝑅𝑥
Table 12
IMD Mathematical definitions extended
Second Order IMD
𝑓𝐼𝑀𝐷2𝑙𝑜𝑤 = 𝑓𝑅𝑥 − 𝑓𝑇𝑥 
𝑓𝑅𝑥 = 𝑓𝐼𝑀𝐷2𝑙𝑜𝑤 + 𝑓𝑇𝑥
Third Order IMD
𝑓𝐼𝑀𝐷3𝑙 = 2𝑓𝑇𝑥 − 𝑓𝑅𝑥 
𝑓𝑅𝑥 = 2𝑓𝑇𝑥 − 𝑓𝐼𝑀𝐷3𝑙
𝑓𝐼𝑀𝐷2ℎ𝑖𝑔ℎ = 𝑓𝑅𝑥 + 𝑓𝑇𝑥 
𝑓𝑅𝑥 = 𝑓𝐼𝑀𝐷2ℎ𝑖𝑔ℎ − 𝑓𝑇𝑥
𝑓𝐼𝑀𝐷3𝑚 = 2𝑓𝑅𝑥 + 𝑓𝑇𝑥  𝑓𝐼𝑀𝐷3ℎ = 𝑓𝑅𝑥 + 2𝑓𝑇𝑥
𝑓𝑅𝑥 = (𝑓𝑇𝑥 − 𝑓𝐼𝑀𝐷3𝑚 )/2 𝑓𝑅𝑥 = 𝑓𝐼𝑀𝐷3ℎ − 2𝑓𝑇𝑥

One of the possible intermodulation scenarios is shown in Figure 17. The transmission (Tx) signal from the
main antenna is coupled into the diversity antenna with high power. This signal (21 dBm or 10 dBm depending
the case) and a received Jammer signal (-15 dBm) are entering the switch. Thanks to the specified application
for the BGS13GA14 in between the filters and the Transceiver, the Tx signal from the main antenna loose until
arriving at the switch input mostly 5 to 10 or more dB, depending of the filter and PCB structure of the RF
frontend. The IMD products are measured with a Tx of 21dBm or 10dBm, which is corresponding to the IMD
spec of a main antenna diversity switch like Infineon BGS13GA14. Therefore, the measured IMD products will be
extremely better in the specified application circuit within the filters and transceiver as showed in the
measurement results below.
Figure 17
Block diagram of RF Switch intermodulation
Application Note
23
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SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Intermodulation
BGS13GA14
Special combinations of TX and Jammer signal are producing intermodulation products 2nd and 3rd order,
which fall in the RX band and disturb the wanted RX signal.
5.2
Measurement Setup
The test setup for the IMD measurements has to provide a very high isolation between RX and TX signals. As an
example the test set-up and the results for the high band are shown (Figure 18 and Table 11).
For the RX / TX separation a professional duplexer with 80 dB isolation is used.
For each distortion scenario there is a min and a max value given. This variation is caused by a phase shifter
connected between switch and duplexer. In the test set-up the phase shifter represents a no ideal matching of
the switch to 50 Ohm.
Figure 18
Block diagram of RF Switch intermodulation
Application Note
24
Revision 1.2
2016-06-07
SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Intermodulation
BGS13GA14
5.3
Measurement Results
Figure 19
IMD products of Band 1 LTE and Pin=21dBm
Table 13
IMD products of Band 1 LTE
IMD Band 1
PTx=21dBm
IMD2Low (fblocker=190MHz)
IMD2High (fblocker=4090MHz)
IMD3 (fblocker=1760MHz)
Application Note
RF1
Min
Max
-103.71
-121.43
-115.89
-103.16
-118.44
-111.76
25
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SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Intermodulation
BGS13GA14
Figure 20
Table 14
IMD products of Band 1 LTE and Pin=10dBm
IMD products of Band 1 LTE
IMD Band 1
PTx=10dBm
IMD2Low (fblocker=190MHz)
IMD2High (fblocker=4090MHz)
IMD3 (fblocker=1760MHz)
Application Note
RF1
Min
Max
-114.97
-130.55
-133.77
-113.70
-125.86
-128.81
26
Revision 1.2
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SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Intermodulation
BGS13GA14
Figure 21
Table 15
IMD products of Band 2 LTE and Pin=21dBm
IMD products of Band 2 LTE
IMD Band 2
PTx=21dBm
IMD2Low (fblocker=80MHz)
IMD2High (fblocker=3840MHz)
IMD3 (fblocker=1800MHz)
Application Note
RF1
Min
Max
-106.14
-121.82
-112.62
-105.51
-119.27
-109.34
27
Revision 1.2
2016-06-07
SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Intermodulation
BGS13GA14
Figure 22
Table 16
IMD products of Band 2 LTE and Pin=10dBm
IMD products of Band 2 LTE
IMD Band 2
PTx=10dBm
IMD2Low (fblocker=80MHz)
IMD2High (fblocker=3840MHz)
IMD3 (fblocker=1800MHz)
Application Note
RF1
Min
Max
-117.90
-130.69
-132.44
-116.34
-128.62
-129.11
28
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SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Intermodulation
BGS13GA14
Figure 23
Table 17
IMD products of Band 5 LTE and Pin=21dBm
IMD products of Band 5 LTE
IMD Band 5
PTx=21dBm
IMD2Low (fblocker=45MHz)
IMD2High (fblocker=1718MHz)
IMD3 (fblocker=791,5MHz)
Application Note
RF1
Min
Max
-102.88
-115.48
-112.65
-102.51
-112.43
-107.78
29
Revision 1.2
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SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Intermodulation
BGS13GA14
Figure 24
Table 18
IMD products of Band 5 LTE and Pin=10dBm
IMD products of Band 5 LTE
IMD Band 5
PTx=10dBm
IMD2Low (fblocker=45MHz)
IMD2High (fblocker=1718MHz)
IMD3 (fblocker=791,5MHz)
Application Note
RF1
Min
Max
-115.05
-126.82
-131.16
-114.32
-124.25
-126.66
30
Revision 1.2
2016-06-07
SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Intermodulation
BGS13GA14
Figure 25
Table 19
IMD products of Band 7 LTE and Pin=21dBm
IMD products of Band 7 LTE
IMD Band 7
PTx=21dBm
IMD2Low (fblocker=120MHz)
IMD2High (fblocker=5190MHz)
IMD3 (fblocker=2415MHz)
Application Note
RF1
Min
Max
-110.59
-121.60
-104.82
-108.03
-119.08
-102.64
31
Revision 1.2
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SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Intermodulation
BGS13GA14
Figure 26
Table 20
IMD products of Band 7 LTE and Pin=10dBm
IMD products of Band 7 LTE
IMD Band 7
PTx=10dBm
IMD2Low (fblocker=120MHz)
IMD2High (fblocker=5190MHz)
IMD3 (fblocker=2415MHz)
Application Note
RF1
Min
Max
-121.09
-130.34
-125.42
-118.42
-125.60
-122.52
32
Revision 1.2
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SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Intermodulation
BGS13GA14
Figure 27
Table 21
IMD products of Band 13 LTE and Pin=21dBm
IMD products of Band 13 LTE
IMD Band 13
PTx=21dBm
IMD2Low (fblocker=31MHz)
IMD2High (fblocker=1533MHz)
IMD3 (fblocker=813MHz)
Application Note
RF1
Min
Max
-128.19
-124.38
-111.54
-124.64
-119.73
-108.32
33
Revision 1.2
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SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Intermodulation
BGS13GA14
Figure 28
Table 22
IMD products of Band 13 LTE and Pin=10dBm
IMD products of Band 13 LTE
IMD Band 13
PTx=10dBm
IMD2Low (fblocker=31MHz)
IMD2High (fblocker=1533MHz)
IMD3 (fblocker=813MHz)
Application Note
RF1
Min
Max
-135.38
-132.11
-132.42
-132.51
-127.44
-128.14
34
Revision 1.2
2016-06-07
SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Harmonic
Generation
BGS13GA14
6
Harmonic Generation
Harmonic generation is another important parameter for the characterization of a RF switch. RF switches have
in such a Differential Band select Switching application to deal with high RF levels, up to 24 dBm. With this high
RF power at the input of the switch harmonics are generated. This harmonics (2nd and 3rd) can disturb the
other reception bands or cause distortion in other RF applications (GPS, WLan) within the mobile phone.
6.1
Measurement Setup
Figure 29
Setup for harmonics measurement
The results for the 2nd and 3rd order harmonic generation at different Bands are shown from for all RF ports on
the following points.
The x-axis show the input power and the y-axis show the generated harmonics in dBm.
Application Note
35
Revision 1.2
2016-06-07
SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Harmonic
Generation
BGS13GA14
6.2
Measurement results
6.2.1
Harmonics for Band 1
Figure 30
2nd harmonics at fc=1950MHz
Figure 31
3rd harmonics at fc=1950MHz
H2
RF1 (dBm)
-83.83
-79.88
-75.93
-71.85
-67.77
-63.85
fc=1950MHz
RFin
(dBm)
Application Note
20
22
24
26
28
30
36
H3
RF1 (dBm)
-71.9
-65.76
-59.56
-53.31
-46.85
-40.32
Revision 1.2
2016-06-07
SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Harmonic
Generation
BGS13GA14
6.2.2
Harmonics for Band 2
Figure 32
2nd harmonics at fc=1880MHz
Figure 33
3rd harmonics at fc=1880MHz
H2
RF1 (dBm)
-84.88
-80.89
-76.82
-72.65
-68.28
-64.96
fc=1880MHz
RFin
(dBm)
Application Note
20
22
24
26
28
30
37
H3
RF1 (dBm)
-81.91
-75.81
-69.55
-63.33
-56.76
-50.13
Revision 1.2
2016-06-07
SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Harmonic
Generation
BGS13GA14
6.2.3
Harmonics for Band 5
Figure 34
2nd harmonics at fc=836,5MHz
Figure 35
3rd harmonics at fc=836,5MHz
H2
RF1 (dBm)
-92.58
-88.53
-84.54
-80.43
-76.45
-70.66
fc=836,5MHz
RFin
(dBm)
Application Note
20
22
24
26
28
30
38
H3
RF1 (dBm)
-96.03
-89.91
-83.68
-77.04
-70.63
-62.91
Revision 1.2
2016-06-07
SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Harmonic
Generation
BGS13GA14
6.2.4
Harmonics for Band 7
Figure 36
2nd harmonics at fc=2535MHz
Figure 37
3rd harmonics at fc=2535MHz
H2
RF1 (dBm)
-85.87
-81.89
-78.07
-73.85
-69.34
-65.15
fc=2535MHz
RFin
(dBm)
Application Note
20
22
24
26
28
30
39
H3
RF1 (dBm)
-76.32
-69.97
-63.59
-57.19
-50.76
-44.23
Revision 1.2
2016-06-07
SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Harmonic
Generation
BGS13GA14
6.2.5
Harmonics for Band 13
Figure 38
2nd harmonics at fc=782MHz
Figure 39
3rd harmonics at fc=782MHz
H2
RF1 (dBm)
-94.49
-90.47
-86.47
-82.32
-78.47
-74.02
fc=782MHz
RFin
(dBm)
Application Note
20
22
24
26
28
30
40
H3
RF1 (dBm)
-95.17
-89.06
-82.93
-76.48
-70.23
-64.26
Revision 1.2
2016-06-07
SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Evaluation
Board and Layout Information
BGS13GA14
7
Evaluation Board and Layout Information
7.1
Evaluation Board
In this application note, the following PCB is used:
PCB Marking: BGS1xGA14
PCB material: Rogers
r of PCB material: 3.55
BGS13GA14 Application Board and deembedding kit
Figure 40
Vias
Rogers 04002, Core,
0.2 mm
Copper
35µm
Figure 41
FR4, 0.8mm
PCB cross-section of the evaluation board for BGS13GA14
Application Note
41
Revision 1.2
2016-06-07
SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Evaluation
Board and Layout Information
BGS13GA14
7.2
Measurement description and deembedding
Below is a picture of the evaluation board used for the measurements (Figure 40). The board is designed in the
way that all connecting 50 Ohm lines have the same length.
To get correct called “device level” measurement values for the insertion loss of the BGS13GA14 all influences
and losses of the evaluation board, lines and connectors have to be eliminated. Therefore a separate deembedding board, representing the line length is necessary.
After full port calibration of the network analyzer (NWA) a deembedding has to be done in several steps:

Use an SMA connector whose inner conductor has been removed to tune out one of the SMA to PCB
transitions using the port extension on one port (Figure 42). Turn port extensions on.

Measure S21 of the half-thru structure (Figure 40, smallest board) with port extension enabled. The
result is the de-embedding of S21 including only one SMA connector and the transmission line to the
chip. Store this as S-parameter (s2p) file.

Turn all port extension off.

Load the stored s-parameter file as de-embedding on all used NWA ports

Check insertion loss with the de-embedding through board (Figure 40 right upper board)
Figure 42
SMA connector for deembeding procedure
If the check of the deembedding shows an insertion loss of the through about +- 0.04 dB (depending on the
measurement setup accuracy, e.g. NWA) then the Device itself can be measured.
Application Note
42
Revision 1.2
2016-06-07
SP3T Diversity Antenna Switch with GPIO Interface
BGS13GA14
Authors
BGS13GA14
8
Authors
Renat Rius, Application Engineer of Business Unit “RF and Protection Devices”
André Dewai, Senior Application Engineer of the Business Unit “RF and Protection Devices”
Application Note
43
Revision 1.2
2016-06-07
Trademarks of Infineon Technologies AG
µHVIC™, µIPM™, µPFC™, AU-ConvertIR™, AURIX™, C166™, CanPAK™, CIPOS™, CIPURSE™, CoolDP™, CoolGaN™, COOLiR™, CoolMOS™, CoolSET™, CoolSiC™,
DAVE™, DI-POL™, DirectFET™, DrBlade™, EasyPIM™, EconoBRIDGE™, EconoDUAL™, EconoPACK™, EconoPIM™, EiceDRIVER™, eupec™, FCOS™, GaNpowIR™,
HEXFET™, HITFET™, HybridPACK™, iMOTION™, IRAM™, ISOFACE™, IsoPACK™, LEDrivIR™, LITIX™, MIPAQ™, ModSTACK™, my-d™, NovalithIC™, OPTIGA™,
OptiMOS™, ORIGA™, PowIRaudio™, PowIRStage™, PrimePACK™, PrimeSTACK™, PROFET™, PRO-SIL™, RASIC™, REAL3™, SmartLEWIS™, SOLID FLASH™,
SPOC™, StrongIRFET™, SupIRBuck™, TEMPFET™, TRENCHSTOP™, TriCore™, UHVIC™, XHP™, XMC™
Trademarks updated November 2015
Other Trademarks
All referenced product or service names and trademarks are the property of their respective owners.
Edition 2016-06-07
Published by
Infineon Technologies AG
81726 Munich, Germany
ifx1owners.
©
2016 Infineon Technologies AG.
All Rights Reserved.
Do you have a question about this
document?
Email: erratum@infineon.com
Document reference
<AN_2016_06_PL32_001>
IMPORTANT NOTICE
The information contained in this application note
is given as a hint for the implementation of the
product only and shall in no event be regarded as a
description or warranty of a certain functionality,
condition or quality of the product. Before
implementation of the product, the recipient of this
application note must verify any function and other
technical information given herein in the real
application.
Infineon
Technologies
hereby
disclaims any and all warranties and liabilities of
any kind (including without limitation warranties of
non-infringement of intellectual property rights of
any third party) with respect to any and all
information given in this application note.
The data contained in this document is exclusively
intended for technically trained staff. It is the
responsibility of customer’s technical departments
to evaluate the suitability of the product for the
intended application and the completeness of the
product information given in this document with
respect to such application.
For further information on the product, technology,
delivery terms and conditions and prices please
contact your nearest Infineon Technologies office
(www.infineon.com).
WARNINGS
Due to technical requirements products may
contain dangerous substances. For information on
the types in question please contact your nearest
Infineon Technologies office.
Except as otherwise explicitly approved by Infineon
Technologies in a written document signed by
authorized
representatives
of
Infineon
Technologies, Infineon Technologies’ products may
not be used in any applications where a failure of
the product or any consequences of the use thereof
can reasonably be expected to result in personal
injury.
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