×

Impedance matching circuit in transmitter circuit and control method thereof

  • US 5,862,458 A
  • Filed: 04/17/1996
  • Issued: 01/19/1999
  • Est. Priority Date: 04/18/1995
  • Status: Expired due to Fees
First Claim
Patent Images

1. An impedance matching circuit in a transmitter circuit, comprising:

  • a modulator for modulating an input signal to output a modulation signal;

    a power amplifier for power-amplifying said modulation signal,an antenna for outputting the signal power-amplified by said power amplifier;

    a demodulator for demodulating the signal power-amplified by said power amplifier to output a demodulation signal;

    a band-outside-component detector for detecting a band-outside-component of said demodulation signal,a controller for outputting a control signal based upon the signal derived from said band-outside-component detector; and

    an impedance matcher for matching an input impedance of said antenna with an impedance of said power amplifier by changing an impedance of said impedance matcher based upon said control signal.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×