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Method and a system for digitally linearizing an amplifier

  • US 6,400,775 B1
  • Filed: 01/05/1999
  • Issued: 06/04/2002
  • Est. Priority Date: 01/06/1998
  • Status: Expired due to Fees
First Claim
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1. A method of digitally linearizing an amplifier having non-linearity, the method comprising the steps of:

  • determining correction parameters for correcting said non-linearity based on an amplified test signal output from the amplifier when a test signal is applied to the input of the amplifier, wherein said test signal is a signal having n tones whose frequencies and amplitudes are known, the step of determining the correction parameters comprising;

    acquiring said amplified test signal in the form of samples in baseband;

    defining a modelled amplifier, by computing parameters of a predetermined amplifier model on the basis of said samples of the amplified test signal; and

    computing said correction parameters on the basis of said modelled amplifier so that said correction parameters linearize said modelled amplifier;

    predistorting an input signal which is to be amplified by said amplifier based on said correction parameters so as to obtain a predistorted signal; and

    amplifying said predistorted signal using said amplifier so that the amplified predistorted signal output by said amplifier corresponds to said input signal as amplified linearly.

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