Appl icat ion Note No. 033Dual-Band Transmit-Receive Switch

Appl icat ion Note, Rev. 2.0, Oct. 2006

RF & Protect ion Devices

Edition 2006-10-11Published by Infineon Technologies AG,81726 München, Germany© Infineon Technologies AG 2009.All Rights Reserved.

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Application Note No. 033

Application Note 3 Rev. 2.0, 2006-10-11

Dual-Band Transmit-Receive Switch

Revision History: 2006-10-11, Rev. 2.0Previous Version: 2000-07-28Page Subjects (major changes since last revision)All Document layout change

Application Note 4 Rev. 2.0, 2006-10-11

Application Note No. 033

Dual-Band Transmit-Receive Switch

1 Dual-Band Transmit-Receive SwitchThis application note covers transmit-receive switch solutions for dual-band / mode systems and appliesspecifically to systems where an octave separates the two bands. A GMS and PCN mobile telephone handsetexample is discussed.

1.1 FunctionThe 5-port circuit shown in Figure 1 alternately connects two transmitters (TX) and two receivers (RX) to oneantenna port. The two transmission lines shown are designed to be quarter-wave at the higher of the twofrequency bands (in this example PCN). Switches S1 to S5 are implemented using PIN diodes. Please seeTable 1 for an explanation of the operating modes of the circuit.

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 wascalculated to be 20 mm (Antenna - RX-PCN) and 13.7 mm (RX-PCN - RX-GSM). Its performance can be furtherimproved by filters to improve isolation and suppress harmonic emissions. A full parts list and componentplacement will be included in the next issue.

Table 1 Operating modesMode S1 S2 S3 S4 S5 CommentTransmit 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.

AN033_Functional_Schematic.vsd

A n t e n n a

5 0 Ω

/ 4 λT X - P C N

R X - G S M 50Ω

/ 4 λ T X - G S M

R X - P C N

S 1

S 2 S 3 S 5

S 4

Application Note No. 033

Dual-Band Transmit-Receive Switch

Application Note 5 Rev. 2.0, 2006-10-11

1.2 Schematic

Figure 2 Full circuit diagram

AN033_full_circuit_diagram.vsd

B AR80

A n t e n n a

5 0 Ω

1 5 p F

4 7 0 p F

2 7 n H

/ 4 λ

B A R 80

T X - P C N R X - G S M

50Ω

15pF

470pF

100nH

/ 4 λ

3 9 n H

1 0 0 n H

1 5 p F

4 7 0 p F

39nH

15pF

470pF

1 5 p F 4 7 0 p F27nH

100pF 100pF

B A R 6 4 - 0 5

B AR64-03W

T X - G S M

R X - P C N C 1

C 2

C 3

C 5

C 4

Application Note 6 Rev. 2.0, 2006-10-11

Application Note No. 033

Dual-Band Transmit-Receive Switch

1.3 Layout

Figure 3 Layout

1.4 Results

Table 2 Results for 28 dBm CW PowerMode C1 C2 C3 C4 C5 ResultTransmit GSM 10 mA -15 V -15 V -15 V 10 mA 0.5 dB insertion loss

71 dBc harmonic suppression50 dBm output IP3

Transmit PCN -15 V 10 mA 10 mA -15 V -15 V 0.5 dB insertion loss71 dBc harmonic suppression

Receive GSM -15 V -15 V -15 V -15 V -15 V 0.5 dB insertion lossNo current consumption

Receive PCN -15 V -15 V -15 V 2 mA Open 0.67 dB insertion lossLow current consumption

AN033_Layout.vsd

Application Note No. 033

Dual-Band Transmit-Receive Switch

Application Note 7 Rev. 2.0, 2006-10-11

1.5 Numerical computation with Microwave Harmonica

Figure 4 Numerical computation 1

AN033_Numerical_computation1.vsd

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 ; Length of PCM quarter lamdaLGSM: 13.70MM; Length of additional line for GSM quarter lambdaWAP: 1.75MM ; Width of quarter lambda lineW50: 1.75MM ; Width of 50 ohm line

BLK ;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 50END

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 50END

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 50END

Application Note 8 Rev. 2.0, 2006-10-11

Application Note No. 033

Dual-Band Transmit-Receive Switch

Figure 5 Numerical computation 2

AN033_Numerical_computation2.vsd

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 5END

FREQ STEP 100MHZ 3GHZ 100MHZEND

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.S1PEND*************************************************************************************

Application Note No. 033

Dual-Band Transmit-Receive Switch

Application Note 9 Rev. 2.0, 2006-10-11

1.6 Computed Frequency Response

Figure 6 RX-GSM

AN033_RX_GMS.vsd

MS24 [dB] RXGSMMS21 [dB] RXGSM

MS23 [dB] RXGSM

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]

-60.00

-50.00

-40.00

-30.00

-20.00

-10.00

0.00

23-JAN-97 14:43:36COMPACT SOFTWARE - MICROWAVE HARMONICA PC V6.6

File: d:\schaffer\proj96\gsm_pcn\gsm_pcn.ckt

Application Note 10 Rev. 2.0, 2006-10-11

Application Note No. 033

Dual-Band Transmit-Receive Switch

Figure 7 RX-PCN

AN033_RX_PCN.vsd

MS34 [dB] RXPCNMS31 [dB] RXPCN

MS32 [dB] RXPCN

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]

-60.00

-50.00

-40.00

-30.00

-20.00

-10.00

0.00

23-JAN-97 14:43:54COMPACT SOFTWARE - MICROWAVE HARMONICA PC V6.6

File: d:\schaffer\proj96\gsm_pcn\gsm_pcn.ckt

Application Note No. 033

Dual-Band Transmit-Receive Switch

Application Note 11 Rev. 2.0, 2006-10-11

Figure 8 TX-PCN

AN033_TX_PCN.vsd

MS24 [dB] TXPCNMS21 [dB] TXPCN

MS23 [dB] TXPCN

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]

-60.00

-50.00

-40.00

-30.00

-20.00

-10.00

0.00

23-JAN-97 14:44:10COMPACT SOFTWARE - MICROWAVE HARMONICA PC V6.6

File: d:\schaffer\proj96\gsm_pcn\gsm_pcn.ckt

Application Note 12 Rev. 2.0, 2006-10-11

Application Note No. 033

Dual-Band Transmit-Receive Switch

Figure 9 TX-GSM

AN033_TX_GSM.vsd

MS13 [dB] TXGSMMS14 [dB] TXGSM

MS12 [dB] TXGSM

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]

-60.00

-50.00

-40.00

-30.00

-20.00

-10.00

0.00

23-JAN-97 14:44:24COMPACT SOFTWARE - MICROWAVE HARMONICA PC V6.6

File: d:\schaffer\proj96\gsm_pcn\gsm_pcn.ckt