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AM-FM transmitter power amplifier

  • US 5,361,403 A
  • Filed: 05/17/1993
  • Issued: 11/01/1994
  • Est. Priority Date: 11/14/1990
  • Status: Expired due to Fees
First Claim
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1. A power amplifier circuit for efficiently generating radio frequency output power to a load at plural output power levels comprising:

  • a power amplifier for amplifying a modulated, radio frequency carrier and generating an amplified signal;

    first matching means for matching an impedance of said circuit to an impedance of said load at a first transmission power level;

    second matching means for matching the impedance of said circuit to the impedance of said load at a second transmission power level;

    switching means for selectively connecting said amplified signal to said load through said first matching means in a first mode to operate said power amplifier means in a linear mode at a first preferred efficiency at said first transmission power level, and connecting said second matching means to said load through said second matching means in a second mode to operate said power amplifier means in a linear mode at a second preferred efficiency at said second power transmission level.

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