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Time division multiplexing connection transceiver and its receiving automatic gain control method

  • US 20040264392A1
  • Filed: 07/29/2003
  • Published: 12/30/2004
  • Est. Priority Date: 01/29/2001
  • Status: Abandoned Application
First Claim
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1. (Amended) a time-division multiplexing and connecting transceiver for transmitting and receiving a radio frequency signal based on time division at different timings by sharing an antenna, said time-division multiplexing and connecting transceiver comprising:

  • a change-over switch being directly connected with said antenna for switching and connecting said antenna to one of a transmitting system and a receiving system; and

    control means for switching said change-over and outputting a transmission signal to said antenna at a transmission timing, for determining a reception level of a reception signal at a reception timing, for switching said change-over switch to the receiving system and the reception signal from said antenna to the receiving system when the reception level is not more than a predetermined value, and for switching said change-over switch to the transmitting system and inputting the signal largely attenuated and leaked front said antenna to the receiving system when the reception level is more than said predetermined value, said receiving system includes an isolator which converts an impedance into that matches the best noise and which matches an input impedance of a first amplifier irrespective of a switching state of the change-over switch, an automatic gain control amplifier which serves as an amplifier for amplifying a radio frequency signal and an intermediate frequency signal, and a demodulating means for demodulating data from the reception signal.

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