Method and device for modeling AM-AM and AM-PM characteristics of an amplifier, and corresponding predistortion method
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United States of America Patent
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Jul 27, 1999
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N/A
app pub date -
Aug 6, 1997
filing date -
Aug 7, 1996
priority date (Note) -
Expired
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Abstract
A method of modeling the AM--AM and AM-PM characteristics of an amplifier includes the step of transmitting a reference signal to the amplifier. The response of the amplifier to the reference signal is digitized to produce two sets of AM--AM and AM-PM reference samples, respectively. Two series of polynomials respectively representative of the AM--AM and the AM-PM characteristics are determined from the samples. The determination of each polynomial allows for the second derivative of the polynomial and for the distances between the samples and points on the curve defined by the polynomial.
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