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One LTE B7 Desense Case Study

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One LTE B7 Desense Case Study

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Transceiver Switch B7_B40 TX B40 PRX HB_PAB7_B40 TX B40 TRX B7 TX B7 PRX ASM PRX Matching PRX Matching Introduction  For B7, there is 10 dB difference in sensitivity between maximum and minimum transmitter power. And the block diagram is as below: 2
Introduction  Remove B40 PRX matching network, the issue disappears. Transceiver Switch B7_B40 TX B40 PRX HB_PAB7_B40 TX B40 TRX B7 TX B7 PRX ASM PRX Matching 3
Introduction  With insufficient port-to-port isolation, B7 TX couples to B40 port, and couples to B7 PRX trace from B40 PRX trace again. Transceiver Switch B7_B40 TX B40 PRX HB_PAB7_B40 TX B40 TRX B7 TX B7 PRX PRX Matching PRX Matching Due to insufficient port-to-port isolation Due to close trace 4
Introduction  Because the couple path is : we have to two solutions :  Change a switch with sufficient port-to-port isolation (at least 32 dB)  With layout modification, enhance the isolation between B40 and B7 PRX traces. 5

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One LTE B7 Desense Case Study

  • 1. 1
  • 2. Transceiver Switch B7_B40 TX B40 PRX HB_PAB7_B40 TX B40 TRX B7 TX B7 PRX ASM PRX Matching PRX Matching Introduction  For B7, there is 10 dB difference in sensitivity between maximum and minimum transmitter power. And the block diagram is as below: 2
  • 3. Introduction  Remove B40 PRX matching network, the issue disappears. Transceiver Switch B7_B40 TX B40 PRX HB_PAB7_B40 TX B40 TRX B7 TX B7 PRX ASM PRX Matching 3
  • 4. Introduction  With insufficient port-to-port isolation, B7 TX couples to B40 port, and couples to B7 PRX trace from B40 PRX trace again. Transceiver Switch B7_B40 TX B40 PRX HB_PAB7_B40 TX B40 TRX B7 TX B7 PRX PRX Matching PRX Matching Due to insufficient port-to-port isolation Due to close trace 4
  • 5. Introduction  Because the couple path is : we have to two solutions :  Change a switch with sufficient port-to-port isolation (at least 32 dB)  With layout modification, enhance the isolation between B40 and B7 PRX traces. 5