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 © Infineon Technologies AG 2009. All Rights Reserved. Attention please! The information herein is given to describe certain components and shall not be considered as a guarantee of characteristics. Terms of delivery and rights to technical change reserved. We hereby disclaim any and all warranties, including but not limited to warranties of non-infringement, regarding circuits, descriptions and charts stated herein. Information For further information on technology, delivery terms and conditions and prices please contact your 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 your nearest Infineon Technologies Office. Infineon Technologies Components may only be used in life-support devices or systems 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. 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) All 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