AN133
A pp li c at io n N o t e, R e v . 1. 2 , N ov e m be r 2 00 7
A p p li c a t i o n N o t e N o . 1 3 3
Low Noise Amplifier for Satellite Digital
M u l t i m e d i a B r o ad c a s t i n g ( D M B ) A p p l i c a t i on s
u s i n g th e S i G e B F P 64 0 T r a n s i s t or
R F & P r o t e c ti o n D e v i c e s
Edition 2007-12-12
Published by
Infineon Technologies AG
81726 München, Germany
© Infineon Technologies AG 2009.
All Rights Reserved.
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Application Note No. 133
Application Note No. 133
Revision History: 2007-12-12, Rev. 1.2
Previous Version: 2003-04-09, Rev. 1.1
Page
Subjects (major changes since last revision)
All
Small changes in figure descriptions
Application Note
3
Rev. 1.2, 2007-12-12
Application Note No. 133
Low Noise Amplifier for Satellite Digital Multimedia Broadcasting (DMB)
1
Low Noise Amplifier for Satellite Digital Multimedia Broadcasting
(DMB) Applications using the SiGe BFP640 Transistor
Overview
•
•
•
•
•
•
BFP640 is investigated for use as an LNA for a 2630 - 2655 MHz Digital Multimedia Broadcasting ("DMB")
application.
Design Goals: Gain = 15 dB, Noise Figure < 1.2 dB, Input / Output Return Loss 10 dB or better,
current < 10 mA from a 3.3 V power supply, Output P1dB > -5 dBm.
Printed Circuit Board used is Infineon Part Number 640-061603 Rev A. Standard FR4 material is used in a
three-layer PCB. Please refer to cross-sectional diagram.
Low-cost, standard "0402" case-size SMT passive components are used throughout. Please refer to
schematic and Bill Of Material. The LNA is unconditionally stable from 5 MHz to 6 GHz.
Total PCB area used for the single LNA stage is approximately 35 mm². Total Parts count, including the
BFP640 transistor, is 12.
Achieved 15 dB gain, 1.0 dB Noise Figure from 2400 - 2700 MHz from a 3.3 V supply, drawing 5.8 mA. Note
noise figure result does NOT "back out" FR4 PCB losses - if the PCB loss at LNA input were extracted, Noise
Figure result would be approximately 0.2 dB lower. Amplifier is unconditionally stable from 5 MHz to 6 GHz.
PCB Cross - Section Diagram
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Figure 1
PCB - Cross Sectional Diagram
Application Note
4
Rev. 1.2, 2007-12-12
Application Note No. 133
Low Noise Amplifier for Satellite Digital Multimedia Broadcasting (DMB)
Summary of LNA Data
T = 25 °C, Network analyzer source power = -35 dBm
Table 1
Summary of Results
Parameter
Result
Frequency Range
2630 - 2655 MHz (can go wider)
DC Current
5.8 mA
DC Voltage, VCC
3.3 V
Collector-Emitter Voltage, VCE
3.1 V
BFP640: VCEmax = 4.0 V
Gain
14.8 dB @ 2630 MHz
14.8 dB @ 2642.5 MHz
14.7 dB @ 2655 MHz
Gain target: 15 dB
Noise Figure
1.0 dB @ 2630 MHz
1.0 dB @ 2642.5 MHz
1.0 dB @ 2655 MHz
See noise figure plots and tabular
data, Figure 3
(These values do not extract PCB
losses, etc. resulting from FR4
board an passives used on PCB these results are at input SMA
connector)
Input P1dB
-11.6 dBm @ 2642.5 MHz
See input power sweep vs. gain plot,
Figure 7
Output P1dB
+2.2 dBm @ 2642.5 MHz
rd
Comments
Input 3 Order Intercept
+8.7 dB @ 2642.5 MHz
Input Return Loss
11.4 dB @ 2630 MHz
11.6 dB @ 2642.5 MHz
11.8 dB @ 2655 MHz
Output Return Loss
11.5 dB @ 2630 MHz
11.4 dB @ 2642.5 MHz
11.2 dB @ 2655 MHz
Reverse Isolation
21.3 dB @ 2630 MHz
21.2 dB @ 2642.5 MHz
21.2 dB @ 2655 MHz
Application Note
5
For Test: Two-Tone Test, see
Figure 15
Rev. 1.2, 2007-12-12
Application Note No. 133
Low Noise Amplifier for Satellite Digital Multimedia Broadcasting (DMB)
Bill of Material
Table 2
Bill of Material, Broadband BFP640 UHF Feedback LNA
Reference
Designator
Value
Manufacturer
Case Size
Function
C1
8.2 pF
Various
0402
DC blocking, input
C2
1.5 pF
Various
0402
DC block, output. Also influences output
and input impedance match.
C3
0.1 µF
Various
0402
Decoupling, low frequency. Also improves
Third-Order Intercept.
C4
8.2 pF
Various
0402
Decoupling (RF short)
C5
5.6 pF
Various
0402
Decoupling (RF short). Also has some
influence on stability (using less than 8.2 pF
causes output of amplifier to “see” more
loss from R1 at lower frequencies →
stability improvement).
C6
0.1 µF
Various
0402
Decoupling, low frequency
L1
10 nH
Murata LQG15H series
low-cost inductor
0402
RF choke at input
L2
2.7 nH
Murata LQG15H series
low-cost inductor
0402
RF choke + impedance match at output
R1
10 Ω
Various
0402
Stability improvement
R2
68 kΩ
Various
0402
Bring bias current / voltage into base of
transistor
R3
30 Ω
Various
0402
Provides some negative feedback for DC
bias / DC operating point to compensate for
variations in transistor DC current gain,
temperature variations, etc.
Q1
-
Infineon Technologies
SOT343
BFP640 B7HF Transistor
J1, J2
-
Johnson 142-0701-841
-
RF input / output connectors
J3
-
AMP 5 pin header MTA100 series 640456-5
(standard pin plating) or
641215-5 (gold plated
pins)
-
DC connector
Application Note
Pins 1, 5 = ground
Pin 3 = VCC
Pins 2, 4 = no connection
6
Rev. 1.2, 2007-12-12
Application Note No. 133
Low Noise Amplifier for Satellite Digital Multimedia Broadcasting (DMB)
Schematic Diagram for UHF LNA
(Note low parts count and simple design)
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Figure 2
Schematic Diagram
Application Note
7
Rev. 1.2, 2007-12-12
Application Note No. 133
Low Noise Amplifier for Satellite Digital Multimedia Broadcasting (DMB)
Noise Figure, Plot, Center of Plot (x-axis) is 2642.5 MHz.
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Figure 3
Noise Figure
Application Note
8
Rev. 1.2, 2007-12-12
Application Note No. 133
Low Noise Amplifier for Satellite Digital Multimedia Broadcasting (DMB)
Noise Figure, Tabular Data
From Rohde & Schwarz FSEK3 + FSEB30
System Preamplifier = MITEQ SMC-02
Table 3
Noise Figure
Frequency
Noise Figure
2392.5 MHz
1.02 dB
2405 MHz
1.01 dB
2417.5 MHz
1.02 dB
2430 MHz
1.01 dB
2442.5 MHz
1.00 dB
2455 MHz
0.99 dB
2467.5 MHz
0.98 dB
2480 MHz
1.01 dB
2492.5 MHz
1.01 dB
2505 MHz
0.99 dB
2517.5 MHz
1.02 dB
2530 MHz
1.01 dB
2542.5 MHz
1.00 dB
2555 MHz
1.02 dB
2567.5 MHz
0.98 dB
2580 MHz
1.02 dB
2592.5 MHz
1.00 dB
2605 MHz
1.00 dB
2617.5 MHz
1.01 dB
2630 MHz
0.97 dB
2642.5 MHz
1.02 dB
2655 MHz
1.00 dB
2667.5 MHz
1.02 dB
2680 MHz
1.02 dB
2692.5 MHz
1.04 dB
2705 MHz
1.03 dB
2717.5 MHz
1.03 dB
2730 MHz
1.01 dB
2742.5 MHz
1.05 dB
2755 MHz
1.06 dB
2767.5 MHz
1.07 dB
2780 MHz
1.04 dB
2792.5 MHz
1.03 dB
2805 MHz
1.03 dB
2817.5 MHz
1.04 dB
2830 MHz
1.03 dB
2842.5 MHz
1.04 dB
Application Note
9
Rev. 1.2, 2007-12-12
Application Note No. 133
Low Noise Amplifier for Satellite Digital Multimedia Broadcasting (DMB)
Table 3
Noise Figure (cont’d)
Frequency
Noise Figure
2855 MHz
1.01 dB
2867.5 MHz
1.07 dB
2880 MHz
1.05 dB
2892.5 MHz
1.07 dB
Application Note
10
Rev. 1.2, 2007-12-12
Application Note No. 133
Low Noise Amplifier for Satellite Digital Multimedia Broadcasting (DMB)
Scanned Image of PC Board
Figure 4
Image of PC Board
Application Note
11
Rev. 1.2, 2007-12-12
Application Note No. 133
Low Noise Amplifier for Satellite Digital Multimedia Broadcasting (DMB)
Scanned Image of PC Board, Close-In Shot.
Figure 5
Image of PC Board, Close-In Shot
Application Note
12
Rev. 1.2, 2007-12-12
Application Note No. 133
Low Noise Amplifier for Satellite Digital Multimedia Broadcasting (DMB)
Stability Factor “K” and Stability Measure “B1”
Note that if K > 1 and B1 > 0, the amplifier is unconditionally stable. Measured LNA s-parameters were taken on
a Network Analyzer and then imported into GENESYS simulation package, which calculates and plots K and B1.
Figure 6
Plot of K(f) and B1(f)
Application Note
13
Rev. 1.2, 2007-12-12
Application Note No. 133
Low Noise Amplifier for Satellite Digital Multimedia Broadcasting (DMB)
Power Sweep at 2642.5 MHz (CW)
Source Power (Input) Swept from -25 to -5 dBm
Input P1dB ≅ -11.6 dBm
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Figure 7
Plot of Power Sweep at 2642.5 MHz
Application Note
14
Rev. 1.2, 2007-12-12
Application Note No. 133
Low Noise Amplifier for Satellite Digital Multimedia Broadcasting (DMB)
Input Return Loss, Log Mag, Wide Sweep
5 MHz - 6 GHz
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Figure 8
Plot of Input Return Loss
Application Note
15
Rev. 1.2, 2007-12-12
Application Note No. 133
Low Noise Amplifier for Satellite Digital Multimedia Broadcasting (DMB)
Input Return Loss, Smith Chart, Wide Sweep
Reference Plane = PCB Input SMA Connector
5 MHz - 6 GHz
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Figure 9
Smith Chart of Input Return Loss
Application Note
16
Rev. 1.2, 2007-12-12
Application Note No. 133
Low Noise Amplifier for Satellite Digital Multimedia Broadcasting (DMB)
Forward Gain, Wide Sweep
5 MHz - 6 GHz
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Figure 10
Plot of Forward Gain
Application Note
17
Rev. 1.2, 2007-12-12
Application Note No. 133
Low Noise Amplifier for Satellite Digital Multimedia Broadcasting (DMB)
Reverse Isolation, Wide Sweep
5 MHz - 6 GHz
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Figure 11
Plot of Reverse Isolation
Application Note
18
Rev. 1.2, 2007-12-12
Application Note No. 133
Low Noise Amplifier for Satellite Digital Multimedia Broadcasting (DMB)
Output Return Loss, Log Mag, Wide Sweep
5 MHz - 6 GHz
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Figure 12
Plot of Output Return Loss
Application Note
19
Rev. 1.2, 2007-12-12
Application Note No. 133
Low Noise Amplifier for Satellite Digital Multimedia Broadcasting (DMB)
Output Return Loss, Smith Chart, Wide Sweep
Reference Plane = PCB Output SMA Connector
5 MHz - 6 GHz
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Figure 13
Smith Chart of Output Return Loss
Application Note
20
Rev. 1.2, 2007-12-12
Application Note No. 133
Low Noise Amplifier for Satellite Digital Multimedia Broadcasting (DMB)
Two-Tone Test, 2642.5 MHz
Input Stimulus for Amplifier Two-Tone Test.
f1 = 2642 MHz, f2 = 2643 MHz, -18 dBm each tone.
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Figure 14
Tow-Tone Test, LNA Response @ 2642.5 MHz
Application Note
21
Rev. 1.2, 2007-12-12
Application Note No. 133
Low Noise Amplifier for Satellite Digital Multimedia Broadcasting (DMB)
Two-Tone Test, 2642.5 MHz
LNA Response to Two-Tone Test.
Input IP3 = -18 + (53.4 / 2) = +8.7 dBm
Output IP3 = +8.7 dBm + 14.8 dB gain = +23.5 dBm
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Figure 15
Tow-Tone Test, LNA Response @ 2642.5 MHz
Application Note
22
Rev. 1.2, 2007-12-12
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