| 摘要 |
PURPOSE:To operate a linear amplifier in an approximately optimum action area by extracting a distortion component and controlling the bias of the linear amplifier so as to minimize said component. CONSTITUTION:An input signal applied to a terminal IN is amplified by the linear amplifier 2 and outputted through a band-pass filter 3. Some part of the amplified signal is applied to a bias control circuit 7 through a low-pass filter 6. Said circuit 7 controls the bias of the linear amplifier 2 so that the output of the low-pass filter 6 can be minimized.
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