| 摘要 |
<p>A gain control circuit includes first and second clamping circuits (1, 3) each of which has a DC shift circuit (6, 9) and a comparator (7, 10) comparing the output of the DC shift circuit (6, 9) with a reference voltage and providing a feedback signal to the respective DC shift circuit (6, 9). A peak detector (4) is responsive to the output of the second clamping circuit (3) and is connected with a comparator (5) which supplies a gain control signal to a variable gain amplifier (2) located between the clamp circuits (1, 3) and also to the comparators (7, 10) associated with the DC shift circuits (6, 9) for varying the follow-up speeds of the clamping circuits (1, 3).</p> |
