AN208 - Infineon

BF P650
Dri v er Amplifier fo r 900 MHz I S M
Applic atio ns
Application Note AN208
Revision: Rev. 1.0
2010-08-06
RF and Protecti on Devi c es
Edition 2010-08-06
Published by
Infineon Technologies AG
81726 Munich, Germany
© 2010 Infineon Technologies AG
All Rights Reserved.
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BFP650
Driver Amplifier for 900MHz ISM Applications
Application Note AN208
Revision History: 2010-08-06
Previous Revision: no previous revision
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Subjects (major changes since last revision)
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MICROTEC™, NUCLEUS™ of Mentor Graphics Corporation. Mifare™ of NXP. MIPI™ of MIPI Alliance, Inc.
MIPS™ of MIPS Technologies, Inc., USA. muRata™ of MURATA MANUFACTURING CO. OmniVision™ of
OmniVision Technologies, Inc. Openwave™ Openwave Systems Inc. RED HAT™ Red Hat, Inc. RFMD™ RF
Micro Devices, Inc. SIRIUS™ of Sirius Sattelite Radio Inc. SOLARIS™ of Sun Microsystems, Inc. SPANSION™
of Spansion LLC Ltd. Symbian™ of Symbian Software Limited. TAIYO YUDEN™ of Taiyo Yuden Co.
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UNIX™ of X/Open Company Limited. VERILOG™, PALLADIUM™ of Cadence Design Systems, Inc. VLYNQ™
of Texas Instruments Incorporated. VXWORKS™, WIND RIVER™ of WIND RIVER SYSTEMS, INC. ZETEX™
of Diodes Zetex Limited.
Last Trademarks Update 2009-10-19
Application Note AN208, Rev. 1.0
3 / 16
2010-08-06
BFP650
Driver Amplifier for 900MHz ISM Applications
List of Content, Figures and Tables
Table of Content
1
Introduction ........................................................................................................................................5
2
Application Information .....................................................................................................................8
3
Typical Measurement Results...........................................................................................................9
4
Measured Graphs .............................................................................................................................10
5
Evaluation Board and layout Information......................................................................................14
Authors..............................................................................................................................................15
List of Figures
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
BFP650 in SOT343 Package ...............................................................................................................5
Application Diagram of a RX-TX base station......................................................................................6
Power transmission using BFP650 for 900MHz application ................................................................7
Schematics of the application circuit ....................................................................................................8
Insertion power gain of the BFP650 driver for 900MHz application...................................................10
Input 1dB Compression point of the BFP650 driver for 900MHz application ....................................10
Input matching of the BFP650 driver for 900MHz application ...........................................................11
Output matching of the BFP650 driver for 900MHz application.........................................................11
Reverse isolation of the BFP650 driver for 900MHz application .......................................................12
Stability K-factor of the BFP650 driver for 900MHz application.........................................................12
rd
3 order intercept point of the BFP650 driver for 900MHz application ..............................................13
Input and output Z-Parameters of the BFP650 driver for 900MHz application ..................................13
Photo Picture of Evaluation Board .....................................................................................................14
PCB Layer Information .......................................................................................................................14
List of Tables
Table 1
Table 2
Table 3
Pin definition.........................................................................................................................................5
Bill-of-Materials.....................................................................................................................................8
Summary of Measurement results (at room temperature) ...................................................................9
Application Note AN208, Rev. 1.0
4 / 16
2010-08-06
BFP650
Driver Amplifier for 900MHz ISM Applications
Introduction
1
Introduction
1.1
Features
•
•
•
For High output power drivers
Ideal for low phase noise oscillators
70GHz ft Silicon Germanium Technology
Figure 1
Table 1
Pin
BFP650 in SOT343 Package
Pin definition
Pin name
comments
1
B
Base of the BFP650 transistor
2
E
Emitter of the BFP650 transistor
3
C
Collector of the BFP650 transistor
4
E
Emitter of the BFP650 transistor
Application Note AN208, Rev. 1.0
5 / 16
2010-08-06
BFP650
Driver Amplifier for 900MHz ISM Applications
Introduction
1.2
Applications
BFP650 from Infineon Technologies is an SiGe:C Heterojunction bipolar transistor dedicated
for high power driver amplifier applications. Thus, this component fits to many applications
related to signal transmission like GSM/UMTS/Edge/LTE/WCDMA Base stations. On those
conditions of use, the transmission module needs a strong signal and moreover, a good
linearity in order to achieve the GSM/UMTS/Edge/LTE/WCDMA standards requirements.
This documentation presents the BFP650 performance in a driver configuration for 900MHz
application. This structure can also be used for 868 MHz ISM band applications and Zigbee.
The following schematic presents a GSM/UMTS/Edge/LTE/WCDMA RX-TX base station
structure. The amplifier structure using BFP650 is in driver configuration. That means that the
amplifier is placed in front of a power amplifier.
In this manner, the amplifier uses a higher current to provide high linearity characteristics.
Such structure is essential in order to send a strong power signal to the receiver part.
On figure 2, the diagram presents a wide range of Infineon components able to fit to a base
station application.
Figure 2
Application Diagram of a RX-TX base station
Application Note AN208, Rev. 1.0
6 / 16
2010-08-06
BFP650
Driver Amplifier for 900MHz ISM Applications
Introduction
1.3
Linearity Consideration
Infineon’s BFP650 shows a high linearity behaviour and presents an input 1dB compression
point of 5.9 dBm in the application circuit.. This power linearity has to be high enough in order
to amplify the signal linearly. A too small input 1dB compression point would limit the gain of
the first stage and thus, create a power loss on the transmission chain (Please see the figure
3). It is also the same case for the output of the driver if this one has too high 1dB
compression Point. In such configuration, the Power amplifier would limit the power of the
signal.
Therefore, the output 1dB compression point power of a stage has to be lower than the input
1dB compression point power of the next stage.
Figure 3
Power transmission using BFP650 for 900MHz application
This application note provides the actual results of the BFP650 as driver from Infineon
Technologies for 900MHz applications.
This driver brings a gain of about 24.3 dB with a noise figure of about 2.4 dB (SMA
connectors and PCB losses of 0.10 dB included) at the frequency of 900MHz.
Furthermore, this device provides an unconditional stability from 0 up to 10 GHz. The
circuit is matched at Input to 50Ω with an input return loss better than13 dB and an
output return loss of 10.0 dB (please refer to table 1). The output -1dB compression
point is measured as high as 17.3 dBm.
Using two tones separated of 1MHz at 900MHz, the input 3rd order intercept point (IIP3)
reaches +6.35 dBm.
Application Note AN208, Rev. 1.0
7 / 16
2010-08-06
BFP650
Driver Amplifier for 900MHz ISM Applications
Application Information
2
Application Information
2.1
Schematics
Figure 4
Schematics of the application circuit
Table 2
Bill-of-Materials
Symbol
Value
Unit
Size
Manufacturer
Comment
C1
47
pF
0402
Various
DC Block/input matching
C2
6.2
pF
0402
Various
DC Block/input matching
C3
22
nF
0402
Various
RF to ground
C4
22
nF
0402
Various
RF to ground
C5
47
pF
0402
Various
DC Block/ output matching
L1
4.7
nH
0402
Murata LQG series
Input matching
L2
33
nH
0402
Murata LQG series
DC feed/input matching
L3
7.5
nH
0402
Murata LQG series
DC feed/output matching
R1
3.9
kΩ
0402
Various
Base collector settings
R2
0
Ω
0402
Various
Jumper
R3
2.7
Ω
0402
Various
DC feed to collector / stability
Q1
Application Note AN208, Rev. 1.0
SOT343
Infineon Technologies SiGe C: bipolar transistor
8 / 16
2010-08-06
BFP650
Driver Amplifier for 900MHz ISM Applications
Typical Measurement Results
3
Typical Measurement Results
Table 3
Summary of Measurement results (at room temperature)
Vcc=2.8V, Ic=76mA, freq=900MHz
Parameter
Symbol
Value
Unit
Frequency Range
Freq
900
MHz
DC Voltage
Vcc
2.8
V
DC Current
Icc
76
mA
Gain
G
24.3
dB
Input P1dB
IP1dB
-5.9
dBm
Output P1dB
OP1dB
17.3
dBm
Input Return Loss
RLin
13.2
dB
Output Return Loss
RLout
10.0
dB
Reverse Isolation
IRev
28.7
dB
Input IP3
IIP3
6.35
dBm
Output IP3
OIP3
30.65
dBm
Noise Figure
NF
2.4
dB
Stability
k
>1
--
Comment/Test Condition
Input Power sweep from Pin=-30…0dBm
Input Power Pin=-30dBm
Pin=-30dBm, f1=900MHz, f2=901MHz
Unconditionnally stable from 0 to 10GHz
Note: the measurements showed in Table 3 are including the PCB and SMA losses of 0.1dB.
Application Note AN208, Rev. 1.0
9 / 16
2010-08-06
BFP650
Driver Amplifier for 900MHz ISM Applications
Measured Graphs
4
Measured Graphs
Insertion Power Gain InBand
30
900 MHz
24.33 dB
25
20
15
10
5
0
0
Figure 5
1000
2000
3000
4000
Frequency (MHz)
5000
6000
Insertion power gain of the BFP650 driver for 900MHz application
Compression point at 1dB
30
-30 dBm
24.22 dB
-5.867 dBm
23.22 dB
Gain(dB)
25
20
15
10
-30
Figure 6
-25
-20
-15
Pin (dBm)
-10
-5
0
Input 1dB Compression point of the BFP650 driver for 900MHz application
Application Note AN208, Rev. 1.0
10 / 16
2010-08-06
BFP650
Driver Amplifier for 900MHz ISM Applications
Measured Graphs
Input Matching
0
-5
-10
900 MHz
-13.24 dB
-15
-20
-25
0
Figure 7
500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000
Frequency (MHz)
Input matching of the BFP650 driver for 900MHz application
Output Matching
0
-5
-10
900 MHz
-9.999 dB
-15
-20
-25
-30
0
Figure 8
500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000
Frequency (MHz)
Output matching of the BFP650 driver for 900MHz application
Application Note AN208, Rev. 1.0
11 / 16
2010-08-06
BFP650
Driver Amplifier for 900MHz ISM Applications
Measured Graphs
Reverse Isolation
50
40
30
900 MHz
28.72 dB
20
10
0
0
Figure 9
500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000
Frequency (MHz)
Reverse isolation of the BFP650 driver for 900MHz application
Stability K Factor
5
4
3
696.81 MHz
1.025
2
1
0
0
Figure 10
2000
4000
6000
Frequency (MHz)
8000
10000
Stability K-factor of the BFP650 driver for 900MHz application
Application Note AN208, Rev. 1.0
12 / 16
2010-08-06
BFP650
Driver Amplifier for 900MHz ISM Applications
Measured Graphs
Figure 11
rd
3 order intercept point of the BFP650 driver for 900MHz application
Z Parameters Input output matching
0.8
1.0
Swp Max
910MHz
2.
0
6
0.
Z11
0.
4
Z22
3.
0
0
4.
10.0
10.0
5.0
4.0
3.0
2.0
1.0
0.8
0.6
0.4
0
0.2
0.2
900 MHz
r 0.882519
x -0.392331
5.0
900 MHz
r 1.74593
x -0.468807
-10.0
2
-4
.0
-5.
0
.0
4
Figure 12
-2
-1.0
-0.8
-0
.6
.0
.
-0
-3
-0.
Swp Min
890MHz
Input and output Z-Parameters of the BFP650 driver for 900MHz application
Application Note AN208, Rev. 1.0
13 / 16
2010-08-06
BFP650
Driver Amplifier for 900MHz ISM Applications
Evaluation Board and layout Information
5
Evaluation Board and layout Information
Figure 13
Photo Picture of Evaluation Board
Figure 14
PCB Layer Information
Application Note AN208, Rev. 1.0
14 / 16
2010-08-06
BFP650
Driver Amplifier for 900MHz ISM Applications
Authors
Authors
Anthony Thomas, RF Engineer of Business Unit “RF and Protection Devices”
Dr.Chih-I Lin, Senior Staff engineer of Business Unit “RF and Protection Devices”
Application Note AN208, Rev. 1.0
15 / 16
2010-08-06
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AN208