AN230 - - Infineon

B GS 15A N 16
Per for man ce of S P5 T A nten na S witc h
WC D MA Di ve rs it y Applic atio ns
Applic atio n N ote A N 230
Revision: Rev. 1.0
2011-02-15
RF and P r otecti on D evic es
Edition 2011-06-09
Published by
Infineon Technologies AG
81726 Munich, Germany
© 2011 Infineon Technologies AG
All Rights Reserved.
LEGAL DISCLAIMER
THE INFORMATION GIVEN IN THIS APPLICATION NOTE IS GIVEN AS A HINT FOR THE
IMPLEMENTATION OF THE INFINEON TECHNOLOGIES COMPONENT ONLY AND SHALL NOT BE
REGARDED AS ANY DESCRIPTION OR WARRANTY OF A CERTAIN FUNCTIONALITY, CONDITION OR
QUALITY OF THE INFINEON TECHNOLOGIES COMPONENT. THE RECIPIENT OF THIS APPLICATION
NOTE MUST VERIFY ANY FUNCTION DESCRIBED 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.
Information
For further information on technology, delivery terms and conditions and prices, please contact the nearest
Infineon Technologies Office (www.infineon.com).
Warnings
Due to technical requirements, components may contain dangerous substances. For information on the types in
question, please contact the nearest Infineon Technologies Office.
Infineon Technologies components may be used in life-support devices or systems only with the express written
approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the
failure of that life-support device or system or to affect the safety or effectiveness of that device or system. Life
support devices or systems are intended to be implanted in the human body or to support and/or maintain and
sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other
persons may be endangered.
BGS15AN16
WCDMA Diversity Applications
Application Note AN230
Revision History: 2011-02-15
Previous Revision: prev. Rev. x.x
Page
Subjects (major changes since last revision)
Trademarks of Infineon Technologies AG
A GOLD™, BlueMoon™, COMNEON™, CONVERGATE™, COSIC™, C166™, CROSSAVE™, CanPAK™,
CIPOS™, CoolMOS™, CoolSET™, CONVERPATH™, CORECONTROL™, DAVE™, DUALFALC™,
DUSLIC™, EasyPIM™, EconoBRIDGE™, EconoDUAL™, EconoPACK™, EconoPIM™, E GOLD™,
EiceDRIVER™, EUPEC™, ELIC™, EPIC™, FALC™, FCOS™, FLEXISLIC™, GEMINAX™, GOLDMOS™,
HITFET™, HybridPACK™, INCA™, ISAC™, ISOFACE™, IsoPACK™, IWORX™, M GOLD™, MIPAQ™,
ModSTACK™, MUSLIC™, my d™, NovalithIC™, OCTALFALC™, OCTAT™, OmniTune™, OmniVia™,
OptiMOS™, OPTIVERSE™, ORIGA™, PROFET™, PRO SIL™, PrimePACK™, QUADFALC™, RASIC™,
ReverSave™, SatRIC™, SCEPTRE™, SCOUT™, S GOLD™, SensoNor™, SEROCCO™, SICOFI™,
SIEGET™, SINDRION™, SLIC™, SMARTi™, SmartLEWIS™, SMINT™, SOCRATES™, TEMPFET™,
thinQ!™, TrueNTRY™, TriCore™, TRENCHSTOP™, VINAX™, VINETIC™, VIONTIC™, WildPass™, X
GOLD™, XMM™, X PMU™, XPOSYS™, XWAY™.
Other Trademarks
AMBA™, ARM™, MULTI ICE™, PRIMECELL™, REALVIEW™, THUMB™ 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. 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.
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 2009 10 19
Application Note AN230, Rev. 1.0
3 / 22
2011-02-15
BGS15AN16
WCDMA Diversity Applications
List of Content, Figures and Tables
Table of Content
1
Introduction ........................................................................................................................................ 5
2
2.1
2.2
2.3
2.4
BGS15AN16 Features ........................................................................................................................ 6
Main Features ...................................................................................................................................... 6
Functional Diagram .............................................................................................................................. 6
Pin Configuration .................................................................................................................................. 7
Pin Description ..................................................................................................................................... 7
3
3.1
3.2
Application .......................................................................................................................................... 8
Application Example ............................................................................................................................. 8
Application Board ................................................................................................................................. 8
4
4.1
Small Signal Characteristics ........................................................................................................... 10
Measurement Results ........................................................................................................................ 10
5
Intermodulation ................................................................................................................................ 14
6
Harmonic Generation ....................................................................................................................... 16
7
Power Compression Measurements on All RF Paths .................................................................. 18
Appendix: Switch Controller Unit ...................................................................................................................... 19
Author
............................................................................................................................................................ 21
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
Figure 15
Figure 16
BGS15AN16 Functional Diagram ........................................................................................................ 6
Pin configuration................................................................................................................................... 7
Application multiband transceiver with antenna diversity switch ......................................................... 8
Circuit diagram of BGS15AN16 application board ............................................................................... 9
Layout of the application board ............................................................................................................ 9
PCB layer information ........................................................................................................................ 10
Forward transmission curves for all RF parts .................................................................................... 11
Return loss for all RF path ................................................................................................................. 11
Block diagram of RF Switch intermodulation ..................................................................................... 14
Test set-up for IMD Measurements.................................................................................................... 15
IMD2 and IMD3 results for Band I ...................................................................................................... 15
Set-up for harmonics measurement ................................................................................................... 16
nd
2 harmonic at fc=830 MHz ............................................................................................................... 17
rd
3 harmonic at fc=830 MHz ................................................................................................................ 17
Power Compression Measurement Results at fc=830 MHz ............................................................... 18
Switch Controller Unit Board .............................................................................................................. 19
List of Tables
Table 1
Table 2
Table 3
Table 4
Table 5
Pin Description (top view) .................................................................................................................... 7
BGS15 Antenna to Port Isolation (in dB) ........................................................................................... 12
BGS15 Port to Port Isolation (in dB) .................................................................................................. 13
Test Conditions and specifications of IMD Measurements ................................................................ 14
Seeting Display of Active RF Path ..................................................................................................... 20
Application Note AN230, Rev. 1.0
4 / 22
2011-02-15
BGS15AN16
WCDMA Diversity Applications
Introduction
1
Introduction
The BGS15AN16 is a generic SP5T RF CMOS switch for applications in the frequency range from 0.1 to 3GHz
with standard GPIO control. It typically is used in mobile cellular devices for WCDMA and GSM/ EDGE receivediversity as described in this application note. Any of the 5 ports
can be used as termination of the diversity antenna handling up to 30 dBm.
This SP5T offers low insertion loss and high robustness against interferer signals at the antenna port and low
harmonic generation in termination mode.
An integrated LDO allows to connect Vdd directly to battery, hence no regulated supply voltage is required. A
power down mode is implemented to avoid current drain when the device is not in use.
The on-chip GPIO controller integrates CMOS logic and level shifters, driven by control inputs from 1.5 V to
Vdd. Unlike GaAs technology, external DC blocking capacitors at the RF Ports are only required if DC voltage is
applied externally.
The BGS15AN16 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 2.3 x 2.3 mm² and a maximum height of 0.77 mm.
Application Note AN230, Rev. 1.0
5 / 22
2011-02-15
BGS15AN16
WCDMA Diversity Applications
BGS15AN16 Features
2
BGS15AN16 Features
2.1
Main Features
• 5 high-linearity Rx ports with power handling capability of up to 30 dBm
• All ports fully symmetrical
• No external decoupling components required
• High ESD robustness up to 8kV according IEC-61000-4-2 with external coil.
• Low harmonic generation
• Low insertion loss
• High port-to-port-isolation
• 0.1 to 3.0 GHz coverage
• Direct connect to battery
• Power down mode
• On-chip control logic supporting logic levels from 1.5 V to Vdd
• Lead and halogen free package (RoHS and WEEE compliant)
• Small leadless package TSNP16 with the size of 2.3 x 2.3 mm² and a maximum height of 0.77 mm
2.2
Functional Diagram
Ant
RF1
RF2
RF3
RF4
RF5
Decoder
+ESD
GND
Vdd Ctrl A Ctrl B Ctrl C
BGS15A_Functional_Diagramm.vsd
Figure 1
BGS15AN16 Functional Diagram
Application Note AN230, Rev. 1.0
6 / 22
2011-02-15
BGS15AN16
WCDMA Diversity Applications
BGS15AN16 Features
2.3
Pin Configuration
V2
ANT
13
DGND
V3
VDD
In Figure 2 the pin configuration in top view is given.
12
11
10
8
RX1
V1
15
7
GND
GND
16
6
RX2
RX5
1
5
GND
2
3
4
RX3
14
GND
GND
RX4
9
BGS15A_Pinout.vsd
Figure 2
Pin configuration
2.4
Pin Description
Table 1
Pin Description (top view)
Pin NO
Name
Pin Type
1
RX5
RX5
Rx RF port 5
2
RX4
I/O
RX RF port 4
3
GND
GND
4
RX3
I/O
5
GND
GND
6
RX2
I/O
7
GND
GND
8
RX1
I/O
9
GND
GND
10
ANT
I/O
11
DGND
GND
Ground
12
VDD
PWR
Vdd supply
13
V3
I
Control pin3
14
V2
I
Control pin2
Control pin1
15
V1
I
16
GND
GND
Application Note AN230, Rev. 1.0
7 / 22
Function
Ground
Rx RF port 3
Ground
Rx RF port 2
Ground
Rx RF port 1
Ground
Antenna port
Ground
2011-02-15
BGS15AN16
WCDMA Diversity Applications
Application
3
Application
3.1
Application Example
In Figure 3 one possible application for the BGS15AN16 is shown. The BGS15AN16 is used as a diversity
switch in combination with a multiband UMTS transceiver.
diversity
antenna
UMTS I Rx
UMTS II Rx
UMTS IV Rx
BGS15A
UMTS VIII Rx
47
Multimode
RF-Transceiver
1st Rx-path
1st
antenna
Tx-path
4-band UMTS transceiver with antenna diversity switch
Figure 3
Application multiband transceiver with antenna diversity switch
3.2
Application Board
In figure 4 the circuit diagram of the BGS15AN16 is shown. Only one inductor at the antenna input is required.
For ESD protection, and matching a 27nH SMD inductor is placed at the antenna port.
Application Note AN230, Rev. 1.0
8 / 22
2011-02-15
BGS15AN16
WCDMA Diversity Applications
V2
V1
GND
10
9
8
14
BGS15AN16
(top view)
15
7
6
16
1
2
RX4
RX5
11
3
4
5
GND
27nH
RX1
GND
RX2
GND
RX3
To SPI
controller
12
13
GND
V3
ANT
VDD
VDD
DGND
Application
BGS15A_Applic.vsd
Figure 4
Circuit diagram of BGS15AN16 application board
Below is a picture of the evaluation board used for the measurements (Figure 5). The board is designed in the
way that all connecting 50 Ohm lines have the same length.
To get correct values for the insertion loss of the BGS15AN16 all influences and losses of the evaluation board,
lines and connectors have to be eliminated. Therefore a separate de-embedding board, representing the line
length is necessary.
The calibration of the network analyser (NWA) is done in severall steps:
- Perform full calibration the on all NWA ports.
- Attach empty SMA connector at port 2 and perform “open” port extension. Turn port extensions on.
- Connect the “half” de-embedding board (figure 6 left board) between port1 and port2, store this as a
s-parameter (sp2) file.
- Turn all port extention off.
- Load the stored s-parameter file as de-embedding on all used NWA ports
- Switch port extention on
- Check insertion loss with the de-embedding through board (figure 6 right board)
Figure 5
Layout of the application board
Application Note AN230, Rev. 1.0
9 / 22
2011-02-15
BGS15AN16
WCDMA Diversity Applications
Small Signal Characteristics
Figure 6
Layout of de-embedding boards
The construction of the PCB is shown in Figure 7.
Vias
Rodgers , 0.2mm
Copper
35µm
FR4, 0.8mm
Figure 7
PCB layer information
4
Small Signal Characteristics
The small signal characteristics are measured at 25 °C with a Network analyzer connected to an automatic
multiport switch box.
4.1
Measurement Results
In the following tables and graphs the most important RF parameter of the BGS15AN16 are shown. The
markers are set to the most important frequencies of the WDCDMA system.
Application Note AN230, Rev. 1.0
10 / 22
2011-02-15
BGS15AN16
WCDMA Diversity Applications
Small Signal Characteristics
RX1
RX2
RX3
RX4
RX5
Forward Transmission Rx Ports_2
0
1710 MHz
-0.4521 dB
-5
[dB]
824 MHz
915 MHz
-0.4043 dB -0.3923 dB
2170 MHz
-0.5589 dB
1910 MHz
-0.4854 dB
-10
-15
-20
300
Figure 8
1300
2300
3300
4300
5300
Frequency (MHz)
6300
7300 8000
Forward transmission curves for all RF parts
RX1
RX2
RX3
RX4
RX5
Reflection ANT- RX Port
0
-10
[dB]
-20
824 MHz
-23.16 dB
2170 MHz
-14.98 dB
-30
-40
-50
300
Figure 9
3300
Frequency (MHz)
6300
8500
Return loss for all RF path
Application Note AN230, Rev. 1.0
11 / 22
2011-02-15
BGS15AN16
WCDMA Diversity Applications
Small Signal Characteristics
In Table 2 the isolation values antenna to the different RF ports are given.
Table 2
BGS15 antenna to port isolation (in dB)
Freq
(MHz)
Rx1
Rx2
Rx3
Rx4
TM5
Ant > RX1
An t> Rx2
Ant > Rx3
Ant > Rx4 Ant > TM5
824
41.4
42.2
43.5
43.6
915
40.4
41
42.5
42.5
1710
34.2
32.7
35.3
35.2
1970
32.9
31
33.7
33.7
2170
31.5
29
31.9
32
824
40.3
36.3
42.6
44.1
915
39.8
35.2
41.5
43
1710
32
28
34.5
35.6
1970
30.3
26.6
33
34.1
2170
28.7
25.3
31.5
32.6
824
42.3
49.8
40.3
46
915
41.2
48.5
39.2
44.8
1710
33
38.5
32.3
36.7
1970
31.2
36.4
30.8
35.1
2170
29.6
34
29.4
33.3
824
43.1
50
45.7
42.8
915
42
48.9
44.1
41.7
1710
33.8
41.8
33.7
33.1
1970
31.9
40
31.7
31.2
2170
30.1
37.8
29.5
29.3
824
43.3
49.1
44.9
41.6
915
42.2
48
43.4
40.6
1710
33.6
41
33.8
32.1
1970
31.7
39.2
31.8
30.1
2170
30
37.1
29.7
28.1
Application Note AN230, Rev. 1.0
12 / 22
2011-02-15
BGS15AN16
WCDMA Diversity Applications
Small Signal Characteristics
The values for the port to port isolation are given in Table 3
Table 3
BGS15 port to port isolation (in dB)
Freq
(MHz)
Rx1
Rx2
Rx3
Rx4
TM5
Ant > RX1
Ant > Rx2
Ant > Rx3
Ant > Rx4 Ant > TM5
824
50.2
44.4
44.9
44.3
915
49.1
43
43.7
43.2
1710
44.3
34.9
36.9
36.3
1970
42.7
32.9
35.1
34.5
2170
40.5
30.3
32.9
32.2
824
33.5
49
46.2
43.8
915
32.3
47.6
45
42.6
1710
26.1
37.6
38.3
35.8
1970
24.7
35.2
36.5
34.1
2170
23.2
32.5
34.2
32
824
34.3
36.7
50.3
42
915
33.1
35.5
49.1
40.8
1710
26.8
29.3
41.6
34.2
1970
25.4
27.9
39.3
32.5
2170
23.8
26.2
36.6
30.6
824
41.2
39.6
34.6
33.6
915
40
38.4
33.4
32.4
1710
34
30.6
27.1
26.1
1970
32.6
29
25.7
24.6
2170
30.9
27
24.1
23.1
824
41.7
41.1
33.3
34.7
915
40.5
39.8
32.1
33.5
1710
34.4
32.2
25.7
27.1
1970
33
30.4
24.3
25.7
2170
31.3
28.2
22.5
24.1
Application Note AN230, Rev. 1.0
13 / 22
2011-02-15
BGS15AN16
WCDMA Diversity Applications
Intermodulation
5
Intermodulation
Another very important parameter of a RF switch is the large signal capability. One of the possible
intermodulation scenarios is shown in Figure 10Figure 9. The transmission (Tx) signal from the main antenna is
coupled into the diversity antenna with with high power.This signal (20 dBm) and a received Jammer signal (-15
dBm) are entering the switch.
Coupled Tx
Signal from
main antenna
Jammer
(CW)
Receiver
Diversity
Antenna
RF Switch
IMD
Figure 10
Block diagram of RF Switch intermodulation
Special combinations of TX and Jammer signal are producing intermodulation products 2
nd
and 3rd order, which
fall in the RX band and disturb the wanted RX signal.
In Table 4 frequencies for 3 bands and the linearity specifications for an undisturbed communication are given.
Table 4
Test conditions and specifications of IMD measurements
Test Conditions
(Tx = +20dBm, Bl = -15dBm,freq.in MHz,@25°C)
Band
Tx Freq.
Rx Freq.
IMD2 Low
Jammer 1
850
836.5
881.5
45
791.5
1900
1880
1960
80
2100
1950
2140
190
Linearity Specification
IMD3
IMD2 High
Jammer 2 Jammer 3
IM2
(dBm)
IIP2
(dBm)
IM3
(dBm)
IIP3
(dBm)
1718
-105
110
-105
65
1800
3840
-105
110
-105
65
1760
4090
-105
110
-105
65
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 11 and Figure 12).
For the RX / TX separation a professional duplexer with 80 dB isolation is used.
In Figure 12 the results for High band are given. 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.
Application Note AN230, Rev. 1.0
14 / 22
2011-02-15
BGS15AN16
WCDMA Diversity Applications
Intermodulation
Load
-20dB
-3dB
Tx
K&L
Mini Circuits
(ZHL-30W-252 -S+)
Signal
Generator
Power
Amplifier
Duplexer
Tunable
Bandpass
Filter
Circulator
DUT
ANT
Phase Shifter /
Delay Line
TRx
-20dB
ANT
K&L
Tunable
Bandpass Filter
Signal
Generator
Rx
K& L
Signal
Analyzer
Figure 11
Power reference plane
PTx = +20 dBm
PBl = -15 dBm
-3 dB
Tunable
Bandpass
Filter
Test set-up for IMD Measurements
IMD Band 1
-100
-105
Rx1
Rx2
Rx3
Rx4
Rx5
-110
190 MHz IMD2 low min
IMD [dBm]
-115
190 MHz IMD2 low max
-120
1760 MHz IMD3 min
-125
1760 MHz IMD3 max
4090 MHz IMD2 high min
-130
4090 MHz IMD2 high max
-135
-140
-145
Figure 12
IMD2 and IMD3 results for Band I
Application Note AN230, Rev. 1.0
15 / 22
2011-02-15
BGS15AN16
WCDMA Diversity Applications
Harmonic Generation
6
Harmonic Generation
Harmonic generation is another important parameter for the characterization of a RF switch. RF switches have
to deal with high RF levels, up to 33 dBm. With this high RF power at the input of the switch harmonics are
generated. This harmonics (2
nd
rd
and 3 ) can disturb the other reception bands or cause distortion in other RF
applications (GPS, WLan) within the mobile phone.
Load
-20dB
Directional
Coupler
-20dB
Signal
Generator
Power
Amplifier
Circulator
Tunable
Bandpass
Filter
A
Power meter
Agilent
E4419B
-3dB
B
DUT
ANT
K&L
Signal
Analyzer
Figure 13
-20dB
Tunable
Bandstop
Filter
Tx
Directional
Coupler
Set-up for harmonics measurement
nd
rd
The results for the harmonic generation at 830 MHZ are shown in Figure 14 (2 harmonic) and Figure 15 (3
harmonic) for all RF ports.
At the x-axis the input power is plotted and at the y- axis the generated harmonics in dBm.
Application Note AN230, Rev. 1.0
16 / 22
2011-02-15
BGS15AN16
WCDMA Diversity Applications
Harmonic Generation
PlotCol(1,5)
Harmonics RF1
PlotCol(1,5)
Harmonics RF2
PlotCol(1,5)
Harmonics RF3
PlotCol(1,5)
Harmonics RF4
PlotCol(1,5)
Harmonics RF5
2nd Harmonics
-45
-50
-55
-60
[dBm]
-65
-70
-75
-80
-85
-90
20
nd
Figure 14
2
21
22
23
24
25
26
Pin [dBm]
27
28
29
30
harmonic at fc=830 MHz
PlotCol(1,6)
Harmonics RF1
PlotCol(1,6)
Harmonics RF2
PlotCol(1,6)
Harmonics RF3
PlotCol(1,6)
Harmonics RF4
PlotCol(1,6)
Harmonics RF5
3rd Harmonics
-45
-50
[dBm]
-55
-60
-65
-70
-75
-80
22
Figure 15
23
24
25
26
Pin [dBm]
27
28
29
30
rd
3 harmonic at fc=830 MHz
Application Note AN230, Rev. 1.0
17 / 22
2011-02-15
BGS15AN16
WCDMA Diversity Applications
Power Compression Measurements on all RF Paths
7
Power Compression Measurements on all RF Paths
To judge the large signal capability the power compression is a usual measurement tool. The input power is
increase and at the output the power is measured. At a certain point the output power could not follow the input
and the switch compresses the RF signal. In the diagram below (Figure 16) the IL is plotted versus the injected
input power. The input power can be increased to 30 dBm and there is no compression visible on none of the
RF ports.
RF1
RF2
RF3
RF4
RF5
Compression Measurement
1
0.9
Insertion Loss [dBm]
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
20
Figure 16
21
22
23
24
25
26
Pin [dBm]
27
28
29
30
Power Compression Measurement Results at fc=830 MHz
The measurements are done on Large Signal measurement setup which is not calibrated for Insertion Loss with
high precision. So the values here may differ with the actual IL values earlier in this report.
Application Note AN230, Rev. 1.0
18 / 22
2011-02-15
BGS15AN16
WCDMA Diversity Applications
Appendix: Switch Controller Unit
Appendix: Switch Controller Unit
The BGS15AN16 is controlled via GPIO interface and Infineon offers a GPIO controller unit to ease the
evaluation of its BGS15AN16 on application board. The unit is very simple to use with a few buttons to select
the right device and different states.
This section helps as a short user guide for the controller unit shown in Figure 17. The controller unit requires a
DC supply of 5.5V with a current capability of 50mA.
G VG
N CN
D CD
to BGS15AN16
P3
P2
GND
GND
Vcc
LVdd
V1
Figure 17
GND
GND
NC
V3
V2
P1
Switch Controller Unit Board
Please observe the following steps to use the controller unit:
1. Step1: Attach the power supply and “OK” appears on the display.
2. Step2: Set the control mode:
a. Press and hold “P1” and “P3” simultaneously until “15” appears on the display
b. “P2” can be used to set the Vdd to the switch between 1.8V, 3.5V (default) and 4.0V
c. To use 4V, please connect to 6V power supply instead of 5.5V
d. “15” addresses BGS15AN16 device
3. Step3: Connect the control unit to the switch with an appropriate cable according to the connector pin
out shown in Figure 17.
4. Step4: Set the switch state to measure using “P1” and “P3”. The active paths corresponding to the state
displayed are tabulated in Table 5.
Application Note AN230, Rev. 1.0
19 / 22
2011-02-15
BGS15AN16
WCDMA Diversity Applications
Table 5
Display of Active RF Path
Display
Active RF Path
R1
ANT – Rx1
R2
ANT – Rx2
R3
ANT – Rx3
R4
ANT – Rx4
TM
ANT – Rx5
DS
Switch Stand-by (Power Down)
Application Note AN230, Rev. 1.0
20 / 22
2011-02-15
BGS15AN16
WCDMA Diversity Applications
Author
Author
Ralph Kuhn, Senior Staff Application Engineer of the Business Unit “RF and Protection Devices”
Application Note AN230, Rev. 1.0
21 / 22
2011-02-15