| 摘要 |
<p>PHD 80-032 In known volume control circuits the overall gain of a low-frequency amplifier is generally varied in that the gain in the negative-feedback branch is varied At very high gain, at which very large output signals are obtained, the negative-feedback is then very small, which may lead to a non-linear distortion. In accordance with the present invention the gain, suitably of the frequencycompensation stage, is therefore varied so that it increases when the overall gain increases. The loop gain at higher output amplitudes is then higher than without this step, so that non-linear distortion is reduced.</p> |
