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Research reports from R.N. Braithwaite and co-authors provide new insights into microwave research
January 20th, 2010
According to a study from the United States, "This paper describes algorithms used to improve linearity, efficiency, and peak power of a Doherty amplifier whose auxiliary transistor gate voltage is adjusted digitally as a function of the signal envelope. Two predistortion stages are used to compensate for high-order memoryless nonlinearities and low-order memory effects."
"The digital gate voltage waveform is a sigmoid function of the predistorted signal's envelope with two voltage limits corresponding to class C and AB bias levels. The instantaneous gate voltage is controlled by two adjustable parameters: a breakpoint and a slope. The parameters are adjusted to reduce the...
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Source: Electronics Newsweekly (2010-01-20)