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Apparatus and method for interference canceller in a high frequency receiver and transmitter

  • US 7,546,107 B2
  • Filed: 12/13/2005
  • Issued: 06/09/2009
  • Est. Priority Date: 12/13/2004
  • Status: Expired due to Fees
First Claim
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1. A high frequency receiver provided in a same housing as a housing including a transmitter having a transmission signal generation part, having a frequency band of a receive signal in a vicinity of a frequency of a carrier wave of a transmission signal generated by the transmission signal generation part, and to which a high frequency signal including the receive signal and a transmission signal released from a transmitting antenna of the transmitter is inputted via an antenna,the high frequency receiver comprising:

  • an antenna input terminal to which the high frequency signal is inputted;

    a mixer having a first input terminal to which the high frequency signal inputted to the antenna input terminal is inputted and a second input terminal to which an output signal from a local oscillator is inputted; and

    an output terminal to which an output signal from the mixer is inputted,wherein the high frequency receiver comprisesa distributed transmission signal input terminal to which at least a part of a distributed transmission signal obtained by distributing the transmission signal is inputted in the housing;

    a phase shifter to which the distributed transmission signal inputted to the distributed transmission signal input terminal is inputted;

    a detector for detecting a level of the transmission signal included in the distributed receive signal obtained by distributing the high frequency signal; and

    a level regulator having a first regulator input terminal to which an output from the detector is coupled and a second regulator input terminal to which the distributed transmission signal is inputted, andthe level regulator changes a level of the distributed transmission signal in accordance with an output signal from the detector, and a signal input via the level regulator and the phase shifter and the high frequency signal are synthesized to be inputted to the mixer.

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