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High efficiency power amplifier circuit with wide dynamic backoff range

  • US 6,157,253 A
  • Filed: 09/03/1999
  • Issued: 12/05/2000
  • Est. Priority Date: 09/03/1999
  • Status: Expired due to Term
First Claim
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1. A power amplifier circuit comprising:

  • a plurality of switches, wherein a first end of each of said plurality of switches is coupled to a corresponding one of a plurality of supply voltages;

    a plurality of power amplifiers, wherein a drain of each of said plurality of power amplifiers is coupled to at least one of said plurality of supply voltages through a second end of said corresponding one of said plurality of switches; and

    a comparator which responds to an amplitude of a radio frequency signal envelope, said comparator being coupled to said second end of each of said plurality of switches and influencing a mode of each of said plurality of switches, thereby influencing an operating state of each of said plurality of power amplifiers.

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