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Amplification systems and methods using fixed and modulated power supply voltages and buck-boost control

  • US 6,285,251 B1
  • Filed: 08/17/2000
  • Issued: 09/04/2001
  • Est. Priority Date: 04/02/1998
  • Status: Expired due to Term
First Claim
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1. A method of amplifying a signal of varying amplitude comprising:

  • amplifying the signal of varying amplitude in a first saturated power amplifier that operates from a fixed voltage power supply to produce a first output signal of constant amplitude;

    amplifying the signal of varying amplitude in a second saturated power amplifier that operates from a modulated voltage power supply to produce a second output signal of amplitude that depends on the signal of varying amplitude, the modulated power supply voltage and on an invert/noninvert control signal;

    combining the first and second output signals into a load; and

    modulating the modulated voltage power supply while generating the invert/noninvert control signal such that the combined first and second output signals into the load amplify the signal of varying amplitude.

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