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System and method for filtering time division multiple access telephone communications

  • US 8,478,205 B2
  • Filed: 04/16/2010
  • Issued: 07/02/2013
  • Est. Priority Date: 06/02/2003
  • Status: Active Grant
First Claim
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1. A method for transceiving Time Division Multiple Access (TDMA) telephone communications through a common filter in a wireless communications device, the method comprising:

  • adjusting a transmitting resonant frequency in response to a tuning voltage signal;

    turning on a power amplifier (PA) in response to a power amplifier (PA) activation signal, wherein the PA amplifies signals for transmission with a tunable ferro-electric band pass filter (FE BPF) in response to the PA activation signal;

    turning off a low noise amplifier (LNA) in response to a LNA deactivation signal;

    after the power amplifier is turned on and the LNA is turned off, transmitting transmission communications in the adjusted transmitting resonant frequency band;

    turning off the power amplifier in response to a power amplifier deactivation signal;

    adjusting a receiving resonant frequency, different from the transmitting resonant frequency, in response to the tuning voltage signal;

    turning on the low noise amplifier (LNA) in response to a LNA activation signal; and

    ,after the power amplifier is turned off and the LNA is turned on, receiving communications in the adjusted receiving resonant frequency band.

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