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B GA 23 1L 7
BDTIC
Impro vi ng I mmuni t y of B GA 23 1L7
agains t O ut - Of -B an d J a m me r s (LT E
Ban d -1 3, G S M85 0/9 00/18 00, U MT S,
WLA N)
Applic atio n N ote A N 273
Revision: Rev. 1.0
2011-09-08
RF and P r otecti on D evic es
www.BDTIC.com/infineon
BDTIC
Edition 2011-09-16
Published by
Infineon Technologies AG
81726 Munich, Germany
© 2011 Infineon Technologies AG
All Rights Reserved.
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THE INFORMATION GIVEN IN THIS APPLICATION NOTE IS GIVEN AS A HINT FOR THE
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PROPERTY RIGHTS OF ANY THIRD PARTY) WITH RESPECT TO ANY AND ALL INFORMATION GIVEN IN
THIS APPLICATION NOTE.
Information
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BGA231L7
LNA for Global Navigation Satellite Systems
Application Note AN273
Revision History: 2011-09-08
Previous Revision: None
Page
Subjects (major changes since last revision)
BDTIC
Trademarks of Infineon Technologies AG
AURIX™, C166™, CanPAK™, CIPOS™, CIPURSE™, EconoPACK™, CoolMOS™, CoolSET™,
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EiceDRIVER™, eupec™, FCOS™, HITFET™, HybridPACK™, I²RF™, ISOFACE™, IsoPACK™, MIPAQ™,
ModSTACK™, my-d™, NovalithIC™, OptiMOS™, ORIGA™, PRIMARION™, PrimePACK™, PrimeSTACK™,
PRO-SIL™, PROFET™, RASIC™, ReverSave™, SatRIC™, SIEGET™, SINDRION™, SIPMOS™,
SmartLEWIS™, SOLID FLASH™, TEMPFET™, thinQ!™, TRENCHSTOP™, TriCore™.
Other Trademarks
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PRIMECELL™, REALVIEW™, THUMB™, µVision™ of ARM Limited, UK. AUTOSAR™ is licensed by
AUTOSAR development partnership. Bluetooth™ of Bluetooth SIG Inc. CAT-iq™ of DECT Forum.
COLOSSUS™, FirstGPS™ of Trimble Navigation Ltd. EMV™ of EMVCo, LLC (Visa Holdings Inc.). EPCOS™
of Epcos AG. FLEXGO™ of Microsoft Corporation. FlexRay™ is licensed by FlexRay Consortium.
HYPERTERMINAL™ of Hilgraeve Incorporated. IEC™ of Commission Electrotechnique Internationale. IrDA™
of Infrared Data Association Corporation. ISO™ of INTERNATIONAL ORGANIZATION FOR
STANDARDIZATION. MATLAB™ of MathWorks, Inc. MAXIM™ of Maxim Integrated Products, Inc.
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., MICROWAVE
OFFICE™ (MWO) of Applied Wave Research Inc., OmniVision™ of OmniVision Technologies, Inc.
Openwave™ Openwave Systems Inc. RED HAT™ Red Hat, Inc. RFMD™ RF Micro Devices, Inc. SIRIUS™ of
Sirius Satellite Radio Inc. SOLARIS™ of Sun Microsystems, Inc. SPANSION™ of Spansion LLC Ltd.
Symbian™ of Symbian Software Limited. TAIYO YUDEN™ of Taiyo Yuden Co. TEAKLITE™ of CEVA, Inc.
TEKTRONIX™ of Tektronix Inc. TOKO™ of TOKO KABUSHIKI KAISHA TA. 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 2011-02-24
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Application Note AN273, Rev. 1.0
3 / 22
2011-09-08
BGA231L7
LNA for Global Navigation Satellite Systems
Table of Content, List of Figures and Tables
Table of Content
1
BGA231L7 GPS Front-End LNA ........................................................................................................ 6
2
Introduction ........................................................................................................................................ 7
3
Application Circuit ............................................................................................................................. 9
4
Typical Measurement Results ......................................................................................................... 10
5
Measured Graphs for GPS and GLONASS bands ........................................................................ 12
6
Miscellaneous Measured Graphs ................................................................................................... 17
7
Evaluation Board .............................................................................................................................. 20
8
Authors .............................................................................................................................................. 21
BDTIC
www.BDTIC.com/infineon
Application Note AN273, Rev. 1.0
4 / 22
2011-09-08
BGA231L7
LNA for Global Navigation Satellite Systems
Table of Content, List of Figures and Tables
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
BGA231L7 in TSLP-7-1 Package (2 mm x 1.3 mm x 0.4 mm) ............................................................ 6
Block diagram of the BGA231L7 for GNSS band 1559-1615MHz applications .................................. 8
BGA231L7 application circuit for improved rejection of out-of-band jammers ..................................... 9
Power gain of BGA231L7 for GPS and GLONASS bands ................................................................ 12
Narrowband power gain of BGA231L7 for GPS and GLONASS bands ............................................ 12
Input matching of BGA231L7 for GPS and GLONASS bands ........................................................... 13
Output matching of BGA231L7 for GPS and GLONASS bands ........................................................ 13
Reverse isolation of BGA231L7 for GPS and GLONASS bands ....................................................... 14
Noise figure of BGA231L7 for GPS and GLONASS bands ............................................................... 14
Input 1 dB compression point of BGA231L7 at supply voltage of 1.8V for GPS and GLONASS
bands .................................................................................................................................................. 15
Input 1 dB compression point of BGA231L7 at supply voltage of 2.8V for GPS and GLONASS
bands .................................................................................................................................................. 15
Carrier and intermodulation products of BGA231L7 for GPS band at Vcc=1.8V .............................. 16
Carrier and intermodulation products of BGA231L7 for GPS band at Vcc=2.8V .............................. 16
Stability factor k of BGA231L7 upto 10GHz ....................................................................................... 17
Stability factor µ1 of BGA231L7 upto 10GHz..................................................................................... 17
Stability factor µ2 of BGA231L7 upto 10GHz..................................................................................... 18
Input and output matching for GPS and GLONASS bands with Vcc=1.8V ....................................... 18
Input and output matching for GPS and GLONASS bands with Vcc=2.8V ....................................... 19
Populated PCB picture of BGA231L7 ................................................................................................ 20
PCB layer stack .................................................................................................................................. 20
BDTIC
Figure 12
Figure 13
Figure 14
Figure 15
Figure 16
Figure 17
Figure 18
Figure 19
Figure 20
List of Tables
Table 1
Table 2
Table 3
Table 4
Table 5
Pin Definition ........................................................................................................................................ 8
Switching Mode .................................................................................................................................... 8
Bill-of-Materials..................................................................................................................................... 9
Electrical Characteristics (at room temperature), Vcc = Vpon = 1.8V ............................................... 10
Electrical Characteristics (at room temperature), Vcc = Vpon = 2.8V ............................................... 11
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Application Note AN273, Rev. 1.0
5 / 22
2011-09-08
BGA231L7
LNA for Global Navigation Satellite Systems
BGA231L7 GPS Front-End LNA
1
BGA231L7 GPS Front-End LNA
1.1
Features
• High gain: 16.0 dB
• High out-of-band input 3rd-order intercept point: +5 dBm
• High input 1dB compression point: -5 dBm
• Low noise figure: 0.75 dB
• Low current consumption: 4.4 mA
• Operating frequency: 1550-1615 MHz
• Supply voltage: 1.5 V to 3.6 V
• Digital on/off switch (1V logic high level)
• Tiny TSLP-7-1 leadless package
• B7HF Silicon Germanium technology
• RF output internally matched to 50 Ω
• Only three external SMD components necessary
• 2 kV HBM ESD protection (including AI-pin)
• Pb-free (RoHS compliant) package
BDTIC
Figure 1
BGA231L7 in TSLP-7-1 Package (2 mm x 1.3 mm x 0.4 mm)
1.2
Applications
- Global Positioning System (GPS)
- GLONASS (Russian GNSS)
- Galileo (European GNSS)
- COMPASS (Chinese Beidou Navigation System)
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Application Note AN273, Rev. 1.0
6 / 22
2011-09-08
BGA231L7
LNA for Global Navigation Satellite Systems
Introduction
2
Introduction
The BGA231L7 is a front-end Low Noise Amplifier (LNA) for Global Navigation Satellite
Systems (GNSS) application. It is based on Infineon Technologies’ B7HF Silicon-Germanium
technology, enabling a cost-effective solution in a small TSLP-7-1 package with low noise
figure, high gain, high linearity and low current consumption over a wide range of supply
voltages from 3.6 V down to 1.5 V. All these features make BGA231L7 an excellent choice
for GNSS LNA as it improves sensitivity, provide greater immunity against out-of-band
BDTIC
jammer signals, reduces filtering requirement and hence the overall cost of the GNSS
receiver.
This application note addresses the issue of out-of-band jammers and improving the
immunity of BGA231L7 against these jammers. The out-of-band signals considered
are LTE Band-13, GSM850/900/1800, UMTS and WLAN as their intermodulation
products fall into GPS band.
The ever growing demand to integrate more and more functionality into one device leads to
many challenges when transmitter/receiver has to work simultaneously without degrading the
performance of each other. In today’s smart-phones a GNSS receiver simultaneously
coexists with transceivers in the GSM/EDGE/UMTS/LTE bands. These 3G/4G transceivers
transmit high power in the range of +24 dBm which due to insufficient isolation couple to the
GNSS receiver. The cellular signals can mix to produce Intermodulation products exactly in
the GNSS receiver frequency band. For example, GSM 1712.7 MHz mixes with UMTS 1850
MHz to produce third-order-product exactly at GPS, LTE Band-13 2nd harmonic falls into GPS
band, GSM 827/897 MHz mixes with WLAN 2402/2472 MHz to produce second-orderproduct at GPS.
The jamming resistance of BGA231L7 against these jammers is improved by increasing the
attenuation of the circuit at these specific out-of-band frequencies (787MHz, 827MHz,
897MHz, 1712MHz, 1850MHz, 2402MHz, 2472MHz). This is achieved by using external
SMDs and a SAW filter before BGA231L7. In some applications where more rejection is
required at special frequencies and SAW filter alone cannot provide sufficient attenuation,
www.BDTIC.com/infineon
Application Note AN273, Rev. 1.0
7 / 22
2011-09-08
BGA231L7
LNA for Global Navigation Satellite Systems
Introduction
some external notches can be designed for those frequencies. Figure 3 shows such an
application circuit where notches have been designed to attenuate 787MHz, 827MHz,
897MHz, 2402 MHz and 2472MHz. The notches L2-C1/L4-C4 and L5-C5 are designed for
750-950MHz range and 2.45GHz respectively. The component values are fine tuned so as to
have optimal noise figure, jammer rejection, gain and input matching.
The Internal circuit diagram of the BGA231L7 is presented in Figure 2. Table 1 shows the pin
assignment of BGA231L7. Table 2 shows the truth table to turn on/off BGA231L7 by applying
BDTIC
different voltage to the PON pin.
Figure 2
Table 1
Pin
Block diagram of the BGA231L7 for GNSS band 1559-1615MHz applications
Pin Definition
Symbol
Comment
1
PON
Power on control
2
AI
LNA input
3
BIAS
DC Bias
4
n.c.
Not connected
5
AO
LNA output
6
VCC
DC Supply
7
GND
RF and DC ground
Table 2
Mode
Switching Mode
Symbol
ON/OFF Control Voltage
Min
Max
On
PON, on
1.0V
VCC
Off
PON, off
0
0.4
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Application Note AN273, Rev. 1.0
8 / 22
2011-09-08
BGA231L7
LNA for Global Navigation Satellite Systems
Application Circuit
3
Application Circuit
3.1
Schematic Diagram
BGA231L7
N1
Pon
L2
N2
SAW
PON, 1
RFout
L3
RFin
L4
C1
Vcc
VCC, 6
L5
L1
AI, 2
AO, 5
BIAS, 3
n.c., 4
C2
GND, 7
BDTIC
C4
Figure 3
C5
BGA231L7 application circuit for improved rejection of out-of-band jammers
Table 3
Symbol
Bill-of-Materials
Value
Unit
Package
Manufacturer
Comment
C2 (optional)
10.0
nF
0201
Various
RF bypass
L1
39.0
nH
0201
Murata LQP series Biasing inductor
L3
7.5
nH
0201
Murata LQP series Matching between SAW and LNA
L2
4.3
nH
0201
Murata LQP series 750-950 MHz Notch
C1
9.0
pF
0201
Various
L4
4.7
nH
0201
Murata LQP series 750-950 MHz Notch
C4
7.0
pF
0201
Various
L5
3.3
nH
0201
Murata LQP series 2.45 GHz Notch
C5
1.0
pF
0201
Various
2.45 GHz Notch
N1
BGA231L7
TSLP-7-1
Infineon
SiGe LNA
N2
SAW
TSNP-7-10
PCB
substrate
FR4
750-950 MHz Notch
750-950 MHz Notch
SAW filter of BGM1033N7
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Application Note AN273, Rev. 1.0
9 / 22
2011-09-08
BGA231L7
LNA for Global Navigation Satellite Systems
Typical Measurement Results
4
Typical Measurement Results
Table 4 and Table 5 show typical measurement results of the application circuit shown in
Figure 3. The values given in this table include losses of the board and the SMA connectors if
not otherwise stated.
Table 4
Electrical Characteristics (at room temperature), Vcc = Vpon = 1.8V
Parameter
Symbol
Value
Unit
DC Voltage
Vcc
1.8
V
DC Current
Icc
4.5
mA
Comment/Test Condition
BDTIC
Frequency
System
Sys
GPS
GLONASS
Frequency
Range
Freq
1575
1602-1615
MHz
Gain
G
15.1
14.7
dB
Noise Figure
NF
2.23
2.62
dB
Input Return
Loss
RLin
14.8
14.9
dB
Output Return
Loss
RLout
21.4
31.8
dB
Reverse
Isolation
IRev
23.6
23.8
dB
Input P1dB
IP1dB
-6.4
-6.0
dBm
Output P1dB
OP1dB
7.7
7.7
dBm
LTE band-13
nd
2 Harmonic
H2
-97.1
dBm
IM2
-104.4
dBm
IM2
-97.5
dBm
IIP3
0.8
dBm
OIP3
15.9
f1 = 1575.5 MHz
dBm f2 = 1576.5 MHz
Input power= -30dBm
IIP3OOB
66.9
dBm
k
>1
--
Output IM2
Out-of-band
Output IM2
Out-of-band
Input IP3
In-band
Output IP3
In-band
Input IP3
Out-of-band
Stability
PCB and SMA connector losses of
0.06 dB substracted
fgps = 1575 MHz
f GLONASS = 1605 MHz
fIN = 787.76 MHz
PIN = +15 dBm
f1 = 827 MHz, P1IN = +12 dBm;
f2 = 2402 MHz, P2IN = +8 dBm
f1 = 897 MHz, P1IN = +12 dBm;
f2 = 2472 MHz, P2IN = +8 dBm
f1 = 1712.7 MHz, P1IN = +10 dBm;
f2 = 1850 MHz, P2IN = +10 dBm
Unconditionnally Stable from 0 to
10GHz
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Application Note AN273, Rev. 1.0
10 / 22
2011-09-08
BGA231L7
LNA for Global Navigation Satellite Systems
Table 5
Electrical Characteristics (at room temperature), Vcc = Vpon = 2.8V
Parameter
Symbol
Value
Unit
DC Voltage
Vcc
2.8
V
DC Current
Icc
4.7
mA
Frequency
System
Sys
Frequency
Range
Freq
1575
1602-1615
MHz
Gain
G
15.2
14.8
dB
GPS
Comment/Test Condition
GLONASS
PCB and SMA connector losses of
0.06 dB substracted
BDTIC
Noise Figure
NF
2.25
2.64
dB
Input Return
Loss
RLin
15.9
15.6
dB
Output Return
Loss
RLout
18.6
27.5
dB
Reverse
Isolation
IRev
24.1
24.3
dB
Input P1dB
IP1dB
-3.6
-3.3
dBm
Output P1dB
OP1dB
10.6
10.5
dBm
LTE band-13
nd
2 Harmonic
H2
-97.5
dBm
IM2
-104.5
dBm
IM2
-97.7
dBm
IIP3
1.0
dBm
OIP3
16.2
f1 = 1575.5 MHz
dBm f2 = 1576.5 MHz
Input power= -30dBm
IIP3OOB
66.9
dBm
k
>1
--
Output IM2
Out-of-band
Output IM2
Out-of-band
Input IP3
In-band
Output IP3
In-band
Input IP3
Out-of-band
Stability
fgps = 1575 MHz
f GLONASS = 1605 MHz
fIN = 787.76 MHz
PIN = +15 dBm
f1 = 827 MHz, P1IN = +12 dBm;
f2 = 2402 MHz, P2IN = +8 dBm
f1 = 897 MHz, P1IN = +12 dBm;
f2 = 2472 MHz, P2IN = +8 dBm
f1 = 1712.7 MHz, P1IN = +10 dBm;
f2 = 1850 MHz, P2IN = +10 dBm
Unconditionnally Stable from 0 to
10GHz
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Application Note AN273, Rev. 1.0
11 / 22
2011-09-08
BGA231L7
LNA for Global Navigation Satellite Systems
Measured Graphs for GPS and GLONASS bands
5
Measured Graphs for GPS and GLONASS bands
BDTIC
Figure 4
Power gain of BGA231L7 for GPS and GLONASS bands
Narrowband gain
16
Gain at Vcc=1.8V
Gain at Vcc=2.8V
15.5
1575 MHz
15.189 dB
S21 (dB)
15
1605 MHz
14.784 dB
1575 MHz
15.095 dB
1605 MHz
14.671 dB
14.5
14
13.5
13
1500
Figure 5
1525
1550
1575
1600
1625
Frequency (MHz)
1650
1675
1700
Narrowband power gain of BGA231L7 for GPS and GLONASS bands
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Application Note AN273, Rev. 1.0
12 / 22
2011-09-08
BGA231L7
LNA for Global Navigation Satellite Systems
Measured Graphs for GPS and GLONASS bands
Input matching
0
S11 at Vcc=1.8V
S11 at Vcc=2.8V
S11 (dB)
-5
-10
1575 MHz
-14.8 dB
-15
1605 MHz
-14.96 dB
BDTIC
1575 MHz
-15.9 dB
1605 MHz
-15.63 dB
-20
-25
1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000
Frequency (MHz)
Figure 6
Input matching of BGA231L7 for GPS and GLONASS bands
Output matching
0
-5
S22 at Vcc=1.8V
S22 (dB)
-10
S22 at Vcc=2.8V
-15
1575 MHz
-18.64 dB
-20
1575 MHz
-21.42 dB
-25
1605 MHz
-27.47 dB
-30
1605 MHz
-31.84 dB
-35
1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000
Frequency (MHz)
Figure 7
Output matching of BGA231L7 for GPS and GLONASS bands
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Application Note AN273, Rev. 1.0
13 / 22
2011-09-08
BGA231L7
LNA for Global Navigation Satellite Systems
Measured Graphs for GPS and GLONASS bands
Isolation
-20
-25
1575 MHz
-23.63 dB
1605 MHz
-23.78 dB
1575 MHz
-24.14 dB
1605 MHz
-24.26 dB
S12 at Vcc=1.8V
S12 at Vcc=2.8V
S12 (dB)
-30
-35
BDTIC
-40
-45
-50
0
Figure 8
500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000
Frequency (MHz)
Reverse isolation of BGA231L7 for GPS and GLONASS bands
Noise figure
3.5
NF at Vcc=1.8V
3.3
NF at Vcc=2.8V
3.1
1605 MHz
2.64
NF (dB)
2.9
2.7
1575 MHz
2.25
2.5
1605 MHz
2.62
2.3
2.1
1575 MHz
2.23
1.9
1.7
1.5
1559
Figure 9
1567
1575
1583
1591
Frequency (MHz)
1599
1607
1615
Noise figure of BGA231L7 for GPS and GLONASS bands
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Application Note AN273, Rev. 1.0
14 / 22
2011-09-08
BGA231L7
LNA for Global Navigation Satellite Systems
Measured Graphs for GPS and GLONASS bands
Compression point at 1dB with Vcc=1.8V
20
P1dB at Vcc=1.8V GPS (1575MHz)
P1dB at Vcc=1.8V GLONASS (1605MHz)
Gain (dB)
18
-25 dBm
14.97 dB
16
-6.353 dBm
13.97 dB
-25 dBm
14.6 dB
14
BDTIC
-5.973 dBm
13.6 dB
12
10
-25
Figure 10
-20
-15
-10
Power (dBm)
-5
0
Input 1 dB compression point of BGA231L7 at supply voltage of 1.8V for GPS and
GLONASS bands
Compression point at 1dB with Vcc=2.8V
20
P1dB at Vcc=2.8V GPS (1575MHz)
P1dB at Vcc=2.8V GLONASS (1605MHz)
Gain (dB)
18
16
-25 dBm
15.04 dB
14
-25 dBm
14.72 dB
-3.594 dBm
14.04 dB
-3.272 dBm
13.72 dB
12
10
-25
Figure 11
-20
-15
-10
Power (dBm)
-5
0
Input 1 dB compression point of BGA231L7 at supply voltage of 2.8V for GPS and
GLONASS bands
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Application Note AN273, Rev. 1.0
15 / 22
2011-09-08
BGA231L7
LNA for Global Navigation Satellite Systems
Measured Graphs for GPS and GLONASS bands
Intermodulation for GPS band
0
-10
1575.5 MHz
-15.19
1576.5 MHz
-15.2
-20
Power (dBm)
-30
-40
-50
-60
BDTIC
1577.5 MHz
-77.5
-70
-80
-90
-100
1573.5
Figure 12
1574.5
1575.5
1576.5
Frequency (MHz)
1577.5
1578.5
Carrier and intermodulation products of BGA231L7 for GPS band at Vcc=1.8V
Intermodulation for GPS band
0
-10
1575.5 MHz
-15.09
1576.5 MHz
-15.11
-20
Power (dBm)
-30
-40
-50
-60
1577.5 MHz
-77.78
-70
-80
-90
-100
1573.5
Figure 13
1574.5
1575.5
1576.5
Frequency (MHz)
1577.5
1578.5
Carrier and intermodulation products of BGA231L7 for GPS band at Vcc=2.8V
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Application Note AN273, Rev. 1.0
16 / 22
2011-09-08
BGA231L7
LNA for Global Navigation Satellite Systems
Miscellaneous Measured Graphs
6
Miscellaneous Measured Graphs
Stability K factor
3
Stability K factor at Vcc=1.8V
Stability K factor at Vcc=2.8V
2
BDTIC
1575 MHz
1.467
1575 MHz
1.519
1
0
0
Figure 14
1000
2000
3000
4000 5000 6000
Frequency (MHz)
7000
8000
9000 10000
Stability factor k of BGA231L7 upto 10GHz
Stability Mu1 factor
3
Stability Mu1 factor at Vcc=1.8V
Stability Mu1 factor at Vcc=2.8V
1575 MHz
1.974
2
1575 MHz
1.959
1
0
0
Figure 15
1000
2000
3000
4000 5000 6000
Frequency (MHz)
7000
8000
9000 10000
Stability factor µ1 of BGA231L7 upto 10GHz
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Application Note AN273, Rev. 1.0
17 / 22
2011-09-08
BGA231L7
LNA for Global Navigation Satellite Systems
Miscellaneous Measured Graphs
Stability Mu2 factor
3
1575 MHz
1.858
2
1575 MHz
1.764
BDTIC
1
Stability Mu2 factor at Vcc=1.8V
Stability Mu2 factor at Vcc=2.8V
0
0
Figure 16
1000
2000
3000
4000 5000 6000
Frequency (MHz)
7000
8000
9000 10000
Stability factor µ2 of BGA231L7 upto 10GHz
0.8
1.0
Input and Output matching with Vcc=1.8V
Swp Max
1615MHz
Output
2.
0
6
0.
Input
0.
4
0
3.
0
4.
5.0
10.0
-3
.0
.0
-2
-1.0
-0.8
-0
.6
.4
-0
Figure 17
5.0
4.0
3.0
2.0
1.0
0.6
0.4
0.2
0.8
1605 MHz
r 0.869902
x -0.312283
1575 MHz
r 0.851994
x -0.307975
2
-0.
10.0
-4
.0
-5.
0
0
1605 MHz
r 1.0497
x 0.00633637
-10.0
0.2
1575 MHz
r 0.898272
x 0.127276
Swp Min
1559MHz
Input and output matching for GPS and GLONASS bands with Vcc=1.8V
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Application Note AN273, Rev. 1.0
18 / 22
2011-09-08
BGA231L7
LNA for Global Navigation Satellite Systems
Miscellaneous Measured Graphs
Swp Max
1615MHz
Output
2.
0
6
0.
0.8
1.0
Input and Output matching with Vcc=2.8V
Input
0.
4
0
3.
0
4.
5.0
10.0
5.0
10.0
4.0
2.0
1.0
0.8
0.6
0.4
0.2
0
1605 MHz
r 1.0269
x 0.0769972
3.0
0.2
1575 MHz
r 0.865286
x 0.17356
BDTIC
1605 MHz
r 0.864862
x -0.280248
-4
.0
-5.
0
-3
.0
2
-0.
-10.0
1575 MHz
r 0.876905
x -0.2781
Figure 18
.0
-2
-1.0
-0.8
-0
.6
.4
-0
Swp Min
1559MHz
Input and output matching for GPS and GLONASS bands with Vcc=2.8V
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Application Note AN273, Rev. 1.0
19 / 22
2011-09-08
BGA231L7
LNA for Global Navigation Satellite Systems
Evaluation Board
7
Evaluation Board
BDTIC
Figure 19
Populated PCB picture of BGA231L7
Vias
FR4, 0.2mm
Copper
35µm
Figure 20
FR4, 0.8mm
PCB layer stack
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Application Note AN273, Rev. 1.0
20 / 22
2011-09-08
BGA231L7
LNA for Global Navigation Satellite Systems
Authors
8
Authors
Jagjit Singh Bal, Application Engineer of Business Unit “RF and Protection Devices”.
Dr. Chih-I Lin, Senior Staff Engineer of Business Unit “RF and Protection Devices”.
BDTIC
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Application Note AN273, Rev. 1.0
21 / 22
2011-09-08
BDTIC
w w w . i n f i n e o n . c o m
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Published by Infineon Technologies AG
AN273