Method and apparatus for reducing non-linear characteristics of a signal modulator by coherent data collection

摘要

A pilot signal is generated and injected into the input (108) of a signal modulator (104). The harmonic signal of a pilot signal produced at the output (110) and due to the non-linear transfer function of the signal modulator (104) is coherently sampled in the time domain to produce a plurality of digital samples. The digital samples are averaged to produce an average harmonic signal value. The bias voltage at which the signal modulator (104) is biased is adjusted to minimize the magnitude of the average harmonic signal value.