AN366 - BGS18MN14_diversity_Sp8T

B GS 18 MN 14
SP 8T Ant enna S wit c h
Di ve rsit y RF Fro nte nd Applic ations
Applic atio n N ote A N 366
Revision: Rev. 1.1
2014-05-23
RF and P r o tecti on D evic es
Edition 2014-06-06
Published by
Infineon Technologies AG
81726 Munich, Germany
© 2014 Infineon Technologies AG
All Rights Reserved.
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BGS18MN14
Diversity RF Frontend Applications
Application Note AN366
Revision History: 2014-05-23
Previous Revision: prev. Rev. 1.0
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Gereral update
Trademarks of Infineon Technologies AG
AURIX™, C166™, CanPAK™, CIPOS™, CIPURSE™, EconoPACK™, CoolMOS™, CoolSET™,
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ISOFACE™, IsoPACK™, MIPAQ™, ModSTACK™, my-d™, NovalithIC™, OptiMOS™, ORIGA™,
POWERCODE™, PRIMARION™, PrimePACK™, PrimeSTACK™, PRO-SIL™, PROFET™, RASIC™,
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Other Trademarks
Advance Design System™ (ADS) of Agilent Technologies, AMBA™, ARM™, MULTI-ICE™, KEIL™,
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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. 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 2011-11-11
Application Note AN366, Rev. 1.1
3 / 19
2014-05-23
BGS18MN14
Diversity RF Frontend Applications
List of Content, Figures and Tables
Table of Content
1
Introduction ................................................................................................................................... 6
2
2.1
2.2
2.3
2.4
BGS18MN14 Features ................................................................................................................... 6
Main Features ................................................................................................................................. 6
Functional Diagram ......................................................................................................................... 6
Pin Configuration ............................................................................................................................ 7
Pin Description ................................................................................................................................ 7
3
3.1
Application .................................................................................................................................... 8
Application Board ............................................................................................................................ 8
4
4.1
4.2
4.3
4.4
4.5
Small Signal Characteristics ........................................................................................................ 9
Insertion Loss from Antenna to the respective RF port with all other ports terminated with 50Ω ...... 10
Return Loss from Antenna to the respective RF port with all other ports terminated with 50Ω ........ 10
Forward Transmission ................................................................................................................... 11
Reflection ANT Port ...................................................................................................................... 11
Isolation Measurement .................................................................................................................. 12
5
5.1
5.2
5.3
Intermodulation ........................................................................................................................... 13
Introduction ................................................................................................................................... 13
IMD Test Set-up ............................................................................................................................ 13
IMD Test Results for Band 1 and 5 ................................................................................................ 14
6
Harmonic Generation .................................................................................................................. 14
7
7.1
Appendix: Switch Controller Unit ............................................................................................... 17
Operating Guide ............................................................................................................................ 17
8
Authors ........................................................................................................................................ 18
Application Note AN366, Rev. 1.1
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2014-05-23
BGS18MN14
Diversity RF Frontend Applications
List of Content, 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
Figure 12
Figure 13
Figure 14
Figure 15
Figure 16
Figure 17
Figure 18
BGS18MN14 Functional Diagram ................................................................................................... 6
BGS18MN14 Pin Configuration ....................................................................................................... 7
RF switch in mobile phone frontend ................................................................................................. 8
Layout of the application board ........................................................................................................ 9
Layout of de-embedding boards ...................................................................................................... 9
PCB layer information ..................................................................................................................... 9
Application circuit ............................................................................................................................ 9
Forward Transmission Curves for RF Ports ................................................................................... 11
Reflection Antenna Port ................................................................................................................ 11
Isolation to Neighbour Port (RX on) ............................................................................................... 12
Block diagram of RF Switch intermodulation .................................................................................. 13
Test set-up for IMD Measurements ............................................................................................... 13
Set-up for harmonics measurement ............................................................................................... 14
nd
2 Harmonic at fc=786,5 MHz ....................................................................................................... 15
rd
3 harmonic at fc=786,5 MHz ........................................................................................................ 15
nd
2 Harmonic at fc=1800 MHz ........................................................................................................ 16
rd
3 Harmonic at fc=1800 MHz......................................................................................................... 16
Switch Controller Unit Board.......................................................................................................... 17
List of Tables
Table 1
Table 2
Table 3
Table 4
Pin Description (top view) ................................................................................................................ 7
Insertion Loss ............................................................................................................................... 10
Return Loss .................................................................................................................................. 10
IMD Measurements ....................................................................................................................... 14
Application Note AN366, Rev. 1.1
5 / 19
2014-05-23
BGS18MN14
Diversity RF Frontend Applications
Introduction
Introduction
1
The BGS18MN14 is a Single Pole Eight Throw (SP8T) Diversity Switch optimized for wireless applications up to
2.7 GHz. It is a perfect solution for multi-mode handsets based on quadband GSM, WCDMA and LTE. The
switch configuration is shown in Fig. 1. The BGS18MN14 comes in a miniature TSNP package and comprises
of a high power CMOS SP8T switch with integrated MIPI RFFE interface.
No external DC blocking capacitors are required in typical applications as long as no DC is applied to any RF
port.
2
BGS18MN14 Features
2.1
Main Features

Suitable for multi-mode EDGE / C2K / WCDMA / LTE applications

Ultra-low insertion loss and harmonics generation

8 high-linearity, interchangeable WCDMA RX ports

0.1 to 2.7 GHz coverage

High port-to-port-isolation

Direct to battery supply enabled by large supply voltage range
from 2.5 V to 5.5 V

Integrated MIPI RFFE interface supporting 1.2 and 1.8 V bus voltage

Software programmable MIPI RFFE USID

No decoupling capacitors required if no DC applied on RF lines

Small form factor 2.0 mm x 2.0 mm

1 kV HBM ESD protection

RoHS and WEEE compliant package
2.2
Functional Diagram
ANT
RX01
RX02
RX03
RX04
RX05
RX06
RX08
RX07
SP8T
Figure 1
GND
VDD
VIO
SCLK
SDATA
MIPI RFFE
Controller
BGS18MN14 Functional Diagram
Application Note AN366, Rev. 1.1
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2014-05-23
BGS18MN14
Diversity RF Frontend Applications
BGS18MN14 Features
13
RX04
14
RX07
RX08
NC
9
8
0
1
2
3
4
VDD
ANT
10
RX01
12
11
RX02
RX05
RX06
Pin Configuration
RX03
2.3
Figure 2
BGS18MN14 Pin Configuration
2.4
Pin Description
Table 1
7
SCLK
6
SDATA
5
VIO
Pin Description (top view)
Pin NO
Name
Pin Type
0
1
GND
RX03
GND
I/O
RF ground; die pad
RX port 3
2
RX02
I/O
RX port 2
3
RX01
I/O
RX port 1
4
VDD
PWR
VDDSupply Voltage
5
VIO
PWR
MIPI RFFE Supply
6
SDATA
I/O
MIPI RFFE data
7
SCLK
I
MIPI RFFE clock
8
9
NC
RX08
I/O
Not connected
RX port 8
10
RX07
I/O
RX port 7
11
RX06
I/O
RX port 6
12
RX05
I/O
RX port 5
13
ANT
RX04
I/O
I/O
Antenna port
RX port 4
14
Application Note AN366, Rev. 1.1
7 / 19
Function
2014-05-23
BGS18MN14
Diversity RF Frontend Applications
Application
Application
3
A typical application of the BGS18MN14 RF switch in a mobile phone application is shown in Figure 3. In the
diversity path of the RF frontend the BGS18MN14 switches the different receive bands to the inputs of the
transceiver. Infineon offers also a broad portfolio of Low Noise Amplifiers and Antenna Switch Modules.
Infineon ASMs
BGSF18G
BGSF110GN26
Infineon RF Switch
BGS18MN14
ASM
Infineon LNAs
BGAxx
Transceiver
Figure 3
RF switch in mobile phone frontend
3.1
Application Board
Below is a picture of the evaluation board used for the measurements (Figure 4). The board is designed so that
3all connecting 50 Ohm lines have the same length.
In order to get accurate values for the insertion loss of the BGS18MN14 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 (Figure 5).
The calibration of the network analyser (NWA) is done in severall steps:
- Perform full calibration 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 5 left board) between port1 and port2, store this as a
s-parameter (.s2p) file.
- Turn all port extentions off.
- Load the stored s-parameter file as de-embedding file for all used NWA ports
- Switch all port extentions on
- Check insertion loss with the de-embedding through board (Figure 5 right board)
Application Note AN366, Rev. 1.1
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2014-05-23
BGS18MN14
Diversity RF Frontend Applications
Small Signal Characteristics
Figure 4
Layout of the application board
Figure 5
Layout of de-embedding boards
The construction of the PCB is shown in Figure 6.
Vias
Rodgers , 0.2mm
Copper
35µm
FR4, 0.7mm
Figure 6
PCB layer information
4
Small Signal Characteristics
The small signal characteristics are measured at 25 °C with a Network analyzer in an application circuit shown
in figure 7.
ANT
BGS18MN14
SP8T
Figure 7
27nH
Application circuit
Application Note AN366, Rev. 1.1
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2014-05-23
BGS18MN14
Diversity RF Frontend Applications
Small Signal Characteristics
4.1
Insertion Loss from Antenna to the respective RF port with all other ports
terminated with 50Ω
Table 2
Insertion Loss
Frequency
(MHz)
740
751
881
942
1842
1960
2017
2140
2350
2593
3500
RX1
0.45
0.44
0.39
0.37
0.42
0.44
0.45
0.47
0.51
0.57
0.81
RX2
0.43
0.43
0.38
0.36
0.42
0.45
0.46
0.49
0.53
0.59
0.83
RX3
0.44
0.44
0.39
0.37
0.44
0.47
0.48
0.52
0.57
0.66
1.01
RX4
0.38
0.37
0.32
0.31
0.44
0.48
0.50
0.54
0.61
0.68
1.03
RX5
0.38
0.38
0.32
0.31
0.44
0.48
0.50
0.55
0.63
0.72
1.02
RX6
0.41
0.40
0.35
0.33
0.40
0.43
0.45
0.49
0.54
0.61
0.84
RX7
0.42
0.42
0.37
0.35
0.42
0.45
0.46
0.49
0.54
0.59
0.78
RX8
0.45
0.45
0.40
0.38
0.42
0.45
0.46
0.49
0.53
0.59
0.79
4.2
Return Loss from Antenna to the respective RF port with all other ports
terminated with 50Ω
Table 3
Return Loss
Frequency
(MHz)
740
751
881
942
1842
1960
2017
2140
2350
2593
3500
RX1
16
16
19
20
24
23
23
22
21
20
15
RX2
17
17
19
20
22
21
21
20
19
18
15
RX3
16
17
19
21
21
20
19
18
18
17
13
RX4
18
18
21
23
16
15
15
14
14
13
11
RX5
18
18
21
23
16
15
15
14
13
12
11
RX6
17
17
19
21
19
18
17
17
16
15
14
RX7
16
17
19
21
20
19
19
18
17
17
16
RX8
16
16
18
19
23
22
21
20
19
18
16
Application Note AN366, Rev. 1.1
10 / 19
2014-05-23
BGS18MN14
Diversity RF Frontend Applications
Small Signal Characteristics
4.3
Forward Transmission
BGS18MN14 Forward Transmission
0
Forward Transmission (dB)
0.75 GHz
-0.37 dB
0.94 GHz
-0.31 dB
2.14 GHz
-0.48 dB
2.35 GHz
-0.53 dB
-0.5
0.88 GHz
-0.32 dB
1.84 GHz
-0.40 dB
3.50 GHz
-0.78 dB
1.96 GHz
-0.44 dB
0.74 GHz
-0.38 dB
-1
2.59 GHz
-0.57 dB
ANT_Rx1
ANT_Rx4
ANT_Rx7
ANT_Rx2
ANT_Rx5
ANT_Rx8
ANT_Rx3
ANT_Rx6
-1.5
0.5
1.5
2.5
3.5
Frequency (GHz)
Figure 8
Forward Transmission Curves for RF Ports
4.4
Reflection ANT Port
BGS18MN14 Reflection Antenna
0
2.69 GHz
-12.3 dB
Reflections (dB)
-10
-20
-30
-40
Rx1
RX3
Rx5
Rx7
Rx2
Rx4
Rx6
Rx8
-50
0.5
1.5
2.5
3.5
Frequency (GHz)
Figure 9
Reflection Antenna Port
Application Note AN366, Rev. 1.1
11 / 19
2014-05-23
BGS18MN14
Diversity RF Frontend Applications
Small Signal Characteristics
4.5
Isolation Measurement
Isolation measured RX on port to neighbor port.
Port Isolaton of Neighbour Ports
0
2.69 GHz
-22 dB
Isolation (dB)
-20
-40
-60
Rx2on_Rx1-Rx3
Rx4on_Rx3-Rx4
Rx6on_Rx6-Rx5
Rx2on_Rx1-Rx2
Rx4on_Rx4-Rx5
RX6on_Rx6-Rx7
Rx8on_Rx8-Rx7
-80
0.05
Figure 10
1.05
2.05
Frequency (GHz)
3.05
3.5
Isolation to Neighbour Port (RX on)
Application Note AN366, Rev. 1.1
12 / 19
2014-05-23
BGS18MN14
Diversity RF Frontend Applications
Intermodulation
5
Intermodulation
5.1
Introduction
Another very important parameter of a RF switch is the large signal capability. One of the possible
intermodulation scenarios is shown in Figure 11. 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 11
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.
5.2
IMD Test Set-up
The test setup for the IMD measurements has to provide a very high isolation between RX and TX signals.
( Figure 12).For the RX / TX separation a professional duplexer with 80 dB isolation is used.
Please find the results for high and low band in table 5 below. 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.
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 12
Power reference plane
PTx = +20 dBm
PBl = -15 dBm
-3 dB
Tunable
Bandpass
Filter
Test set-up for IMD Measurements
Application Note AN366, Rev. 1.1
13 / 19
2014-05-23
BGS18MN14
Diversity RF Frontend Applications
Harmonic Generation
5.3
IMD Test Results for Band 1 and 5
Table 4
IMD Measurements
Band 1
TX
Intermodulation Products UMTS
Band 1
Interferer
Testcase
FIN (MHz)
PIN (dBm)
FIN (MHz)
PIN (dBm)
FIMD (MHz)
PIMD (dBm)
IIPx (dBm)
IMD3
IMD2 low
IMD2 high
1950
1950
1950
20
20
20
1760
190
4090
-15
-15
-15
2140
2140
2140
-106
-102
-115
65.5
107
120
TX
Band 5
Intermodulation Products UMTS
Band 5
Interferer
Testcase
FIN (MHz)
PIN (dBm)
FIN (MHz)
PIN (dBm)
FIMD (MHz)
PIMD (dBm)
IIPx (dBm)
IMD3
IMD2 low
IMD2 high
835
835
835
20
20
20
790
45
1715
-15
-15
-15
880
880
880
-109
-95
-107
67
100
112
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 27 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
Application Note AN366, Rev. 1.1
14 / 19
2014-05-23
BGS18MN14
Diversity RF Frontend Applications
Harmonic Generation
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.
BGS18MN14 RX at fin=786.5MHz
-50
RX1
-55
RX2
-60
RX3
H2 (dBm)
-65
RX4
-70
RX5
-75
RX6
-80
RX7
-85
RX8
-90
20
21
22
23
24
25
26
27
Pin (dBm)
Figure 14
nd
2
Harmonic at fc=786,5 MHz
BGS18MN14 RX at fin=786.5MHz
-30
RX1
-35
-40
RX2
-45
RX3
H3 (dBm)
-50
-55
RX4
-60
RX5
-65
RX6
-70
-75
RX7
-80
RX8
-85
-90
20
21
22
23
24
25
26
27
Pin (dBm)
Figure 15
rd
3 harmonic at fc=786,5 MHz
Application Note AN366, Rev. 1.1
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2014-05-23
BGS18MN14
Diversity RF Frontend Applications
Harmonic Generation
BGS18MN14 RX at fin=1800MHz
-30
RX1
-35
-40
RX2
-45
RX3
H2 (dBm)
-50
-55
RX4
-60
RX5
-65
RX6
-70
-75
RX7
-80
RX8
-85
-90
20
21
22
23
24
25
26
27
Pin (dBm)
Figure 16
nd
2
Harmonic at fc=1800 MHz
BGS18MN14 RX at fin=1800MHz
-30
RX1
-35
-40
RX2
-45
RX3
H3 (dBm)
-50
-55
RX4
-60
RX5
-65
RX6
-70
-75
RX7
-80
RX8
-85
-90
20
21
22
23
24
25
26
27
Pin (dBm)
Figure 17
rd
3 Harmonic at fc=1800 MHz
Application Note AN366, Rev. 1.1
16 / 19
2014-05-23
BGS18MN14
Diversity RF Frontend Applications
Appendix: Switch Controller Unit
Appendix: Switch Controller Unit
7
The BGS18MN14 is controlled via MIPI interface and Infineon offers a MIPIcontroller unit to ease the evaluation
of its BGS18MN14 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 18. The controller unit requires a
DC supply of 5.5V with a current capability of 50mA.
G VG
N CN
D CD
to BGSF18D
P3
P2
GND
GND
Vcc
LVdd
FRM
GND
GND
NC
SPI
CLK
Figure 18
P1
Switch Controller Unit Board
Please observe the following steps to use the controller unit:
7.1
Operating Guide
1.
2.
3.
4.
Connect evalboard and control unit via controller cable
Connect control unit to power supply
Version number “S.0” is displayed
Press P1 and P3 simultaneously until desired switch type is displayed
- “0D” for BGS110MN20
- “8D” for BGS18MN14
- “6D” for BGS16MN14
*
5. Press P1 or P3 to enable active mode “PU” is displayed
6. Press P1 or P3 to alter switch state
- IS … Isolation Mode (all channels off)
- PD … Power Down Mode (low current consumption)
- PU ... Power Up Mode (active mode)
- R1 – R0 ... RX1 – RX10 enabled
Application Note AN366, Rev. 1.1
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2014-05-23
BGS18MN14
Diversity RF Frontend Applications
Authors
8
Authors
Ralph Kuhn, Senior Staff Application Engineer of the Business Unit “RF and Protection Devices”
Andre Dewai, Senior Application Engineer of the Business Unit “RF and Protection Devices”
Application Note AN366, Rev. 1.1
18 / 19
2014-05-23
w w w . i n f i n e o n . c o m
Published by Infineon Technologies AG
AN366
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