AGC_WITH_VARICAP

Published:2009/7/16 2:53:00 Author:Jessie | From:SeekIC

Basic voltage-controlled capacitor circuit uses capacitance variation with voltage of back-biased diode constructed to have large capacitance changes, such as Varicap. Circuits give different insertion losses and gain changes. Left: 5 db insertion loss and 16 db gain control range for agc bias of 15 v. Center: 2 db loss and 11 db gain range. Right: 7 db loss and 18 db gain range. AII can be reasonably flat for 200-Mc bandwidth.-W. A. Rheinfelder, Designing Automatic Gain Control Systems, EEE, 13;1, p 53-57.



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