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Predistortion circuit

  • US 4,564,816 A
  • Filed: 05/09/1984
  • Issued: 01/14/1986
  • Est. Priority Date: 05/09/1984
  • Status: Expired due to Fees
First Claim
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1. A predistortion circuit for predistorting a signal applied to a following power amplifier exhibiting phase and amplitude nonlinearities as a function of input power, said circuit comprising in combination:

  • an input terminal coupled to receive a signal to be amplified and an output terminal coupled to the input of said power amplifier;

    means for power dividing a signal applied to the circuit input terminal and for providing a 90°

    phase shift of one divided signal relative to the other;

    first and second active nonlinear means each adapted for receiving an input signal from a different one of the outputs of said power divider and each adapted for producing an output signal; and

    means coupled to receive the output signals from the nonlinear means for combining in phase the signals produced by the active nonlinear means;

    said active nonlinear means each adapted for receiving a bias voltage for controlling the amount of distortion produced by the predistortion circuit whereby the predistortion circuit predistorts the signal in a manner complementary to the distortion produced by the following power amplifier.

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