AN033 - Dual-Band Transmit-Receive Switch

A pp li c a t i o n N o t e , R e v . 2 . 0 , O c t . 2 00 6
A p p li c a t i o n N o t e N o . 0 3 3
D u a l - B a n d T r an s m i t - R ec e i v e S w i t c h
R F & P r o t e c ti o n D e v i c e s
Edition 2006-10-11
Published by Infineon Technologies AG,
81726 München, Germany
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Application Note No. 033
Dual-Band Transmit-Receive Switch
Revision History: 2006-10-11, Rev. 2.0
Previous Version: 2000-07-28
Page
Subjects (major changes since last revision)
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Document layout change
Application Note
3
Rev. 2.0, 2006-10-11
Application Note No. 033
Dual-Band Transmit-Receive Switch
1
Dual-Band Transmit-Receive Switch
This application note covers transmit-receive switch solutions for dual-band / mode systems and applies
specifically to systems where an octave separates the two bands. A GMS and PCN mobile telephone handset
example is discussed.
1.1
Function
The 5-port circuit shown in Figure 1 alternately connects two transmitters (TX) and two receivers (RX) to one
antenna port. The two transmission lines shown are designed to be quarter-wave at the higher of the two
frequency bands (in this example PCN). Switches S1 to S5 are implemented using PIN diodes. Please see
Table 1 for an explanation of the operating modes of the circuit.
An te n n a
RX-PCN
S4
S1
50Ω
TX-GS M
50Ω
λ /4
TX-PCN
λ/4
S2
S3
RX-GS M
S5
AN033_Functional_Schem atic.vsd
Figure 1
GMS/PCN Dual band TX/RX switch - Functional Schematic
A test circuit was built using 1 mm FR4 for the PCB, on which the lenght of the λ/4 transmission lines was
calculated to be 20 mm (Antenna - RX-PCN) and 13.7 mm (RX-PCN - RX-GSM). Its performance can be further
improved by filters to improve isolation and suppress harmonic emissions. A full parts list and component
placement will be included in the next issue.
Table 1
Operating modes
Mode
S1
S2
S3
S4
S5
Comment
Transmit GSM
ON
OFF
OFF
OFF
ON
Both λ/4 lines for PCN from one λ/4 line for GSM
(half the frequency!). The shortcircuit at S5 is
thereby transformed into an open-circuit at the
antenna port.
Transmit PCN
OFF
ON
ON
OFF
OFF
The λ/4 line between S3 and the antenna port
transforms the short circuit at S3 into an open
circuit at the antenna port.
Receive GSM
OFF
OFF
OFF
OFF
OFF
The receiver for GSM is connected to the
antenna port by both λ/4 lines.
Receive PCN
OFF
OFF
OFF
ON
ON
The shortcircuit at S5 is transformed into an
open circuit at S4. The receiver for PCN is
connected to the antenna port.
Application Note
4
Rev. 2.0, 2006-10-11
Application Note No. 033
Dual-Band Transmit-Receive Switch
1.2
Schematic
An te n n a
C1
C3
RX-PCN
470pF
470 p F
C4
27nH
15pF
15pF
4 70 pF
15p F
10 0 n H
B AR64-03W
39nH
5 0Ω
TX-GS M
100p F
50Ω
100p F
λ /4
TX-PCN
B AR6 4 -0 5
λ/4
B AR80
39nH
27 n H
RX-GS M
B AR80
100nH
15p F
15pF
4 70 p F
470pF
C5
C2
AN033_full_circuit_diagram .vsd
Figure 2
Full circuit diagram
Application Note
5
Rev. 2.0, 2006-10-11
Application Note No. 033
Dual-Band Transmit-Receive Switch
1.3
Layout
AN033_Layout.vsd
Figure 3
Layout
1.4
Results
Table 2
Results for 28 dBm CW Power
Mode
C1
C2
C3
C4
C5
Result
Transmit GSM
10 mA
-15 V
-15 V
-15 V
10 mA
0.5 dB insertion loss
71 dBc harmonic suppression
50 dBm output IP3
Transmit PCN
-15 V
10 mA
10 mA
-15 V
-15 V
0.5 dB insertion loss
71 dBc harmonic suppression
Receive GSM
-15 V
-15 V
-15 V
-15 V
-15 V
0.5 dB insertion loss
No current consumption
Receive PCN
-15 V
-15 V
-15 V
2 mA
Open
0.67 dB insertion loss
Low current consumption
Application Note
6
Rev. 2.0, 2006-10-11
Application Note No. 033
Dual-Band Transmit-Receive Switch
1.5
Numerical computation with Microwave Harmonica
Numerical computation with Microwave Harmonica:
****************************************************************************
*
*
* Dual-Band Mode Transmit-Receive Switch for GSM / PCN Mobile Telephones *
*
*
* Date: 12/1986
*
* Author: J. P. Schaffer; WS SD CE, Infineon Technologies AG
*
*
*
****************************************************************************
LPCN: 20.0MM ;
LGSM: 13.70MM;
WAP: 1.75MM
;
W50: 1.75MM
;
BLK
Length of PCM quarter lamda
Length of additional line for GSM quarter lambda
Width of quarter lambda line
Width of 50 ohm line
;Mode TX_GSM
ONE
100 120
B63ON
; BAR63-03W ON STATE
ONE
200 220
B63OF
; BAR63-03W OFF STATE
CROS 120 580 560 220 W1=W50 W2=W50 W3=W50 W4=W50 SUB
TRL
580 500
W=W50
P=10MM
SUB
TRL
560 420
W=WAP
P=LPCN
SUB
ONE
480 400
B63OF
; BAR63-03W OFF STATE
RES
400
0
R=50
CAP
420 440
C=100PF
TWO
440 460
0 B80OF
; BAR80 OFF STATE
CAP
460 480
C=100PF
TRL
480 320
W=W50
P=LGSM
SUB
TWO
320 300
0 B80ON
; BAR80 ON STATE
TXGSM: 4POR
100 200 300 500 ; 100=TX_GSM 200=TX_PCN 300=RX_GSM 400=RX_PCN 50
END
BLK
;Mode TX_PCN
ONE
100 120
B63OF
; BAR63-03W OFF STATE
ONE
200 220
B63ON
; BAR63-03W ON STATE
CROS 120 580 560 220 W1=W50 W2=W50 W3=W50 W4=W50 SUB
TRL
580 500
W=W50
P=10MM
SUB
TRL
560 420
W=WAP
P=LPCN
SUB
ONE
480 400
B63OF
; BAR63-03W OFF STATE
CAP
420 440
C=100PF
TWO
440 460
0 B80ON
; BAR80 ON STATE
CAP
460 480
C=100PF
TRL
480 320
W=W50
P=LGSM
SUB
TWO
320 300
0 B80OF
; BAR80 OFF STATE
RES
300
0
R=50
RES
300
0
R=50
TXPCN: 4POR
100 200 400 500 ; 100=TX_GSM 200=TX_PCN 300=RX_GSM 400=RX_PCN 50
END
BLK
;Mode RX_GSM
ONE
100 120
B63OF
; BAR63-03W OFF STATE
ONE
200 220
B63OF
; BAR63-03W OFF STATE
RES
200
0
R=50
CROS 120 580 560 220 W1=W50 W2=W50 W3=W50 W4=W50 SUB
TRL
580 500
W=W50
P=10MM
SUB
TRL
560 420
W=WAP
P=LPCN
SUB
ONE
480 400
B63OF
; BAR63-03W OFF STATE
CAP
420 440
C=100PF
TWO
440 460
0 B80OF
; BAR80 OFF STATE
CAP
460 480
C=100PF
TRL
480 320
W=W50
P=LGSM
SUB
TWO
320 300
0 B80OF
; BAR80 OFF STATE
RXGSM: 4POR
100 300 400 500 ; 100=TX_GSM 200=TX_PCN 300=RX_GSM 400=RX_PCN 50
END
AN033_Num erical_com putation1.vsd
Figure 4
Numerical computation 1
Application Note
7
Rev. 2.0, 2006-10-11
Application Note No. 033
Dual-Band Transmit-Receive Switch
BLK
;Mode RX_PCN
ONE
100 120
B63OF
; BAR63-03W OFF STATE
RES
100
0
R=50
ONE
200 220
B63OF
; BAR63-03W OFF STATE
CROS 120 580 560 220 W1=W50 W2=W50 W3=W50 W4=W50 SUB
TRL
580 500
W=W50
P=10MM
SUB
TRL
560 420
W=WAP
P=LPCN
SUB
ONE
480 400
B63ON
; BAR63-03W ON STATE
CAP
420 440
C=100PF
TWO
440 460
0 B80OF
; BAR80 OFF STATE
CAP
460 480
C=100PF
TRL
480 320
W=W50
P=LGSM
SUB
TWO
320 300
0 B80ON
; BAR80 ON STATE
RXPCN: 4POR
200 300 400 500 ; 100=TX_GSM 200=TX_PCN 300=RX_GSM 400=RX_PCN 5
END
FREQ
STEP
END
100MHZ
3GHZ
100MHZ
DATA
SUB: MS H=1MM ER=4.8 TAND=0.01 MET1=CU 35UM
B80OF:DUMMY
FILE=MWV00u00.S2P
B80ON:DUMMY
FILE=MWV0010M.S2P
B63OF:DUMMY
FILE=acv00U00.S1P
B63ON:DUMMY
FILE=acV0010M.S1P
END
*************************************************************************************
AN033_Num erical_com putation2.vsd
Figure 5
Numerical computation 2
Application Note
8
Rev. 2.0, 2006-10-11
Application Note No. 033
Dual-Band Transmit-Receive Switch
1.6
Computed Frequency Response
23-JAN-97
COMPACT SOFTWARE - MICROWAVE HARMONICA PC V6.6
File: d:\schaffer\proj96\gsm_pcn\gsm_pcn.ckt
MS21 [dB] RXGSM
MS23 [dB] RXGSM
0.00
14:43:36
MS24 [dB] RXGSM
-10.00
-20.00
-30.00
-40.00
-50.00
-60.00
0
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6 1.8
2
2.2 2.4 2.6 2.8
3
Freq [GHz]
AN033_RX_GM S.vsd
Figure 6
RX-GSM
Application Note
9
Rev. 2.0, 2006-10-11
Application Note No. 033
Dual-Band Transmit-Receive Switch
23-JAN-97
COMPACT SOFTWARE - MICROWAVE HARMONICA PC V6.6
File: d:\schaffer\proj96\gsm_pcn\gsm_pcn.ckt
MS31 [dB] RXPCN
MS32 [dB] RXPCN
0.00
14:43:54
MS34 [dB] RXPCN
-10.00
-20.00
-30.00
-40.00
-50.00
-60.00
0
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6 1.8
2
2.2 2.4 2.6 2.8
3
Freq [GHz]
AN033_RX_PCN.vsd
Figure 7
RX-PCN
Application Note
10
Rev. 2.0, 2006-10-11
Application Note No. 033
Dual-Band Transmit-Receive Switch
23-JAN-97
COMPACT SOFTWARE - MICROWAVE HARMONICA PC V6.6
File: d:\schaffer\proj96\gsm_pcn\gsm_pcn.ckt
MS21 [dB] TXPCN
MS23 [dB] TXPCN
0.00
14:44:10
MS24 [dB] TXPCN
-10.00
-20.00
-30.00
-40.00
-50.00
-60.00
0
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6 1.8
2
2.2 2.4 2.6 2.8
3
Freq [GHz]
AN033_TX_PCN.vsd
Figure 8
TX-PCN
Application Note
11
Rev. 2.0, 2006-10-11
Application Note No. 033
Dual-Band Transmit-Receive Switch
23-JAN-97
COMPACT SOFTWARE - MICROWAVE HARMONICA PC V6.6
File: d:\schaffer\proj96\gsm_pcn\gsm_pcn.ckt
MS14 [dB] TXGSM
MS12 [dB] TXGSM
0.00
14:44:24
MS13 [dB] TXGSM
-10.00
-20.00
-30.00
-40.00
-50.00
-60.00
0
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6 1.8
2
2.2 2.4 2.6 2.8
3
Freq [GHz]
AN033_TX_GSM .vsd
Figure 9
TX-GSM
Application Note
12
Rev. 2.0, 2006-10-11
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