Not For New Design
RF3865
WIDE BANDWIDTH, HIGH LINEARITY
LOW NOISE AMPLIFIER/LINEAR DRIVER
Package Style: QFN, 20-Pin, 5 mm x 5 mm
Features
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Low Noise and High Intercept
Point
Adjustable Bias Current for
enhanced IP3
Single 2.5 V to 6.0 V Power
Supply
400 MHz to 3800 MHz Operation
QFN20, 5 mm x 5 mm Package
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Functional Block Diagram
Product Description
The RF3865 is a low noise amplifier with a high output IP3. The amplifier
is self-biased from a single voltage supply with 50 : input and output
ports. The useful frequency range is from 400 MHz to 3800 MHz. A 1 dB
noise figure and 36 dBm OIP3 performance is achieved with a 5 V VDD,
180 mA. Current can be increased to raise OIP3 while having minimal
effect on noise figure. The IC is featured in a standard QFN, 20-pin,
5 mm x 5 mm package.
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„
WiMAX LNA or Linear Driver
GSM 900, CDMA, PCS, UMTS
LNA
WLAN LNA
High Gain Linear Amplification
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Applications
Ordering Information
RF3865
RF3865PCK-410
Wide Bandwidth, High Linearity Low Noise Amplifier/Linear
Driver
Fully Assembled Evaluation Board with 5 Sample Parts
1.8 GHz to 3.8 GHz
700 MHz to 1100 MHz
Optimum Technology Matching® Applied
GaAs HBT
GaAs MESFET
InGaP HBT
SiGe BiCMOS
Si BiCMOS
SiGe HBT
9GaAs pHEMT
Si CMOS
Si BJT
GaN HEMT
RF MEMS
LDMOS
RF MICRO DEVICES®, RFMD®, Optimum Technology Matching®, Enabling Wireless Connectivity™, PowerStar®, POLARIS™ TOTAL RADIO™ and UltimateBlue™ are trademarks of RFMD, LLC. BLUETOOTH is a trademark owned by Bluetooth SIG, Inc., U.S.A. and licensed for use by RFMD. All other trade names, trademarks and registered trademarks are the property of their respective owners. ©2006, RF Micro Devices, Inc.
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RF3865
Rating
Supply Voltage
Input RF Level (See Note 1)
Current Drain, IDD
Unit
6
V
+10
dBm
150 per stage
mA
Operating Ambient Temperature
-40 to +85
°C
Storage Temperature
-40 to +150
°C
Note 1. Max continuous RF IN is +10 dBm. The max transient RF IN is
+20 dBm.
Parameter
Min.
Specification
Typ.
Max.
Caution! ESD sensitive device.
Exceeding any one or a combination of the Absolute Maximum Rating conditions may
cause permanent damage to the device. Extended application of Absolute Maximum
Rating conditions to the device may reduce device reliability. Specified typical performance or functional operation of the device under Absolute Maximum Rating conditions is not implied.
RoHS status based on EU Directive 2002/95/EC (at time of this document revision).
The information in this publication is believed to be accurate and reliable. However, no
responsibility is assumed by RF Micro Devices, Inc. ("RFMD") for its use, nor for any
infringement of patents, or other rights of third parties, resulting from its use. No
license is granted by implication or otherwise under any patent or patent rights of
RFMD. RFMD reserves the right to change component circuitry, recommended application circuitry and specifications at any time without prior notice.
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Absolute Maximum Ratings
Parameter
Unit
3800
MHz
220
mA
VDD = 5 V
20
dB
+25°C, VDD = 5 V, IDD = 180 mA, 3500 MHz
unless specified
Noise Figure
1.1
Output IP3
37
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High Band
Frequency
3300
Condition
Output P1dB
22
dBm
S11
-17
S22
-17
S12
-33
Current
180
Gain
Frequency
1800
Current
27.5
Noise Figure
Output IP3
Output P1dB
S22
S12
dB
dB
dB
2700
MHz
220
mA
VDD = 5 V
28.5
31.0
dB
+25°C, VDD = 5 V, IDD = 180 mA, 2000 MHz
unless specified
1.0
1.2
dB
34
36
dBm
21.0
22.5
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f1 = 3500 MHz, f2 = 3501 MHz
180
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Mid Band
dB
dBm
25.0
f1 = 2000 MHz, f2 = 2001 MHz
dBm
-10
dB
-20
dB
-40
dB
Low Band
Frequency
Current
700
180
1100
MHz
220
mA
VDD = 5 V
dB
+25°C, VDD = 5 V, IDD = 180 mA, 850 MHz
unless specified
Gain
33
Noise Figure
1.2
dB
OIP3
36
dBm
OP1dB
22
dBm
S11
-15
dB
S22
-18
dB
S12
-40
dB
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f1 = 851 MHz, f2 = 851 MHz
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or [email protected]
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RF3865
Parameter
Min.
Specification
Typ.
Max.
Unit
Condition
Thermal
ThetaJC
30
°C/W
Dissipated power = VDD*(IDD1 + IDD2)
Power Supply
2.5
5.0
6.0
V
Operating Current
130
180
220
mA
VDD = 5 V, R3 = open
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Device Operating Voltage
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support, contact RFMD at (+1) 336-678-5570 or [email protected]
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RF3865
Not connected.
RF input pin. 50 : matched. This pin is DC-blocked.
Not connected.
AC ground. Shunt cap may be added for tuning.
Not connected.
Interstage RF output.
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Not connected.
Interstage RF input.
Not connected.
AC ground. Shunt resistor may be added to increase IDD and OIP3.
Not connected.
RF output pin. 50 : matched. This pin is DC-blocked
Not connected.
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10
11
12
13
14
15
16
17
18
19
20
Pkg
Base
Description
Not connected.
Not connected.
Not connected.
Bias voltage. 2.5 V to 6.0 V applied through bias inductor.
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8
9
Function
NC
NC
RF IN
NC
AC GND1
NC
INTERSTAGE
OUT
NC
INTERSTAGE
IN
NC
AC GND2
NC
RF OUT
NC
NC
NC
VD2
NC
VD1
NC
GND
Not connected.
Bias voltage. 2.5 V to 6.0 V applied through bias inductor.
Not connected.
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Pin
1
2
3
4
5
6
7
Ground connection and heat sink.
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Package Drawing
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support, contact RFMD at (+1) 336-678-5570 or [email protected]
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RF3865
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Evaluation Board Schematic
R3 is DNP for standard 180 mA current draw. If R3 is added, the IDD will increase. A 20 : R3 will raise the current to achieve
higher linearity.
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support, contact RFMD at (+1) 336-678-5570 or [email protected]
5 of 10
RF3865
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Application Schematic
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support, contact RFMD at (+1) 336-678-5570 or [email protected]
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RF3865
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support, contact RFMD at (+1) 336-678-5570 or [email protected]
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RF3865
RF3865 matched from 550 - 3000 MHz (Refer to Application Schematic)
Vcc = 5 V, Icc = 170 mA
5
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40
4.5
35
4
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3
20
2.5
2
15
Noise Figure (d
dB)
3.5
25
1.5
gain
10
OIP3
OP1dB
NF
5
0
0
500
1000
Fo
Gain, OIP3, OP1dB (dB,, dBm, dBm)
30
1500
2000
2500
1
0.5
0
3000
3500
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Gain, OIP3, OP1dB
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RF3865
Theory of Operation
Low noise figure and high gain/IP3 make the RF3865 ideal for use as both receive LNA and transmit driver for cellular/DCS/PCS/UMTS and WiMax platforms, in addition to many other general purpose applications. Standard evaluation boards
cover 700 MHz to 1100 MHz and 800 MHz to 3800 MHz. Viewing the data sheet evaluation board schematic, refer below for
the purpose/function of external components.
• R2/L4/C6 (0 :/unpopulated/unpopulated on standard evaluation boards); These unused components were placed for
convenience and flexibility when needed to optimize matching for an out of band application.
• L3/C5/C7: Placed to optimize input match and enhance out of band low frequency stability.
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• R3: Optionally placed to increase bias current and IP3. 20 : value is found to be the best case. Refer to RF3861, RF3863,
and RF3866 data sheets for graphical demonstration of 20 : optimal value. RF3865 has been confirmed to follow the
same trend.
• L1/C3/R5/C8: Interstage tuning.
• L2/C4: Influence output return loss.
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RF3865 has internal DC-blocking capacitors at RFin and RFout. In addition, it has been shown impedance seen looking out at
pins 7/9/17/19 influence response. As a result, two port s-parameters become non-applicable. If matching is desired for frequency bands outside of those provided with standard evaluation boards, an application schematic within this data sheet for
550 MHz to 3000 MHz serves as an example. In the 550 MHz to 3000 MHz application, design goals were as follows:
• Input and output return loss equal to or better than 10 dB over the entire 2450 MHz bandwidth.
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• IP3 and compression point in line with standard evaluation board performance.
These goals were attained, with additional specifications shown in the graph section of the data sheet:
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• Noise figure < = 1.2 dB from 1000 MHz to 2500 MHz
• Gain > 30 dB from 550 MHz to 2000 MHz
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The above matching discussion should be helpful when considering use in frequency bands outside of those covered by standard evaluation boards. It can be noted here that application schematics and standard boards collectively cover 87% of the
usable bandwidth from 400 MHz to 3800 MHz. As such, choosing from these available schematics should accommodate the
majority of applications that come about.
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7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or [email protected]
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RF3865
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7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or [email protected]
DS130515
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