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AM-FM transmitter power amplifier

  • US 5,423,074 A
  • Filed: 04/11/1994
  • Issued: 06/06/1995
  • Est. Priority Date: 11/14/1990
  • Status: Expired due to Term
First Claim
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1. A transmitter for selectively modulating a carrier signal using a variety of modulation techniques, comprising:

  • a power amplifier having an input for a signal to be amplified and an output for supplying an amplified signal;

    a load impedance connected to said amplifier output for receiving the amplified signal; and

    means for varying said load impedance based on a parameter that depends on the selected modulation technique,wherein the power amplifier maintains a linear mode of operation when the selected modulation technique is alternatively amplitude modulation, complex modulation, and constant amplitude modulation.

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