Radio transceiver system with low noise amplifier capable of being regulated dynamically in working bias voltage

Radio transceiver system with low noise amplifier capable of being regulated dynamically in working bias voltage

  • CN 100,380,828 C
  • Filed: 06/17/1999
  • Issued: 04/09/2008
  • Est. Priority Date: 06/17/1999
  • Status: Active Grant
First Claim
Patent Images

1. radio transceiver system, it includes:

  • One antenna is used for receiving or emitting radio frequency signal;

    One fundamental frequency signal processor is used for handling fundamental frequency signal;

    One radio-frequency transmissions circuit is electrically connected between this fundamental frequency signal processor and this antenna, is used for converting the fundamental frequency signal that this fundamental frequency signal processor is exported to radiofrequency signal and it being exported via this antenna, and this radio-frequency transmissions circuit includes;

    One modulator is used for being modulated into one second intermediate-freuqncy signal with one of transmitted fundamental frequency signal by this fundamental frequency signal processor;

    One second automatic gain amplifier is used for adjusting according to one second gain control signal that this fundamental frequency signal processor is sent the gain of this second intermediate-freuqncy signal;

    One second frequency mixer is used for that second intermediate-freuqncy signal of this second automatic gain amplifier output is carried out mixing and transmits to produce one;

    AndOne second amplifier is used for transmitting of this second frequency mixer output being amplified and it being launched via this antenna;

    AndOne radio-frequency (RF) receiving circuit, be electrically connected between this fundamental frequency signal processor and this antenna, be used for and convert fundamental frequency signal to and it is imported this fundamental frequency signal processor from the received radiofrequency signal of this antenna, this radio-frequency (RF) receiving circuit comprises a low noise amplifier, be used for amplifying the radiofrequency signal that this antenna receives, this low noise amplifier also comprises a control end and is used for controlling its operating bias point;

    It is characterized in that;

    this fundamental frequency signal processor includes an amplifier control unit, be electrically connected on the control end of this second amplifier and this low noise amplifier, be used for controlling the unlatching of this second amplifier or closing, to bring in the Dc bias electric current that changes this low noise amplifier via the control of this low noise amplifier, thereby change the operating bias point of this low noise amplifier, so that the radiofrequency signal that this low noise amplifier can keep this antenna of linear amplification to be received.

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