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Radio transmitter with power amplifier and linearization

  • US 5,524,285 A
  • Filed: 11/02/1993
  • Issued: 06/04/1996
  • Est. Priority Date: 11/02/1993
  • Status: Expired due to Term
First Claim
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1. A radio transmitter responsive to a transmit control signal comprising:

  • a power amplifier for providing a transmit radio signal at an output;

    a linearizer that compensates for non-linearity in the power amplifier;

    a feedback path having an input coupled to the output of the power amplifier and an output coupled to the linearizer for feeding a portion of the transmit radio signal from the output of the power amplifier to the linearizer, said power amplifier, linearizer and feedback path forming a loop having adjustable loop linearization parameters;

    a look-up table having predetermined loop linearization parameters stored therein; and

    a controller having an operating condition input, said controller being coupled to the look-up table and the loop for selecting a loop linearization parameter in response to the transmit control signal according to the operating condition input to the controller at the time of receipt of the transmit control signal.

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