| 摘要 |
Briefly described the present invention is a feed forward amplifier network employing a frequency swept pilot tone signal in order to reduce the distortion generated by the network's power amplifier. A frequency swept pilot tone, generated for example by a variable frequency oscillator, is injected into the input path of the power amplifier's input signal. Thereafter, distortion cancellation employed to generate an amplified output signal, substantially free of both pilot tone and the distortion signals generated by the power amplifier. The amplified output signal is then detected by a detector, phase locked to the variable frequency oscillator, in order to ascertain the average pilot tone energy remaining within the amplified output signal. In response to a detection, various amplifier network characteristics are adjusted in order to reduce the amount of pilot tone at the amplifier network output.
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