CONTROL_AT_LOW_GAIN_LEVELS

Published:2009/6/30 22:22:00 Author:May | From:SeekIC

Diode is used as variable impedance in voltage-divider network at input of video amplifier to provide AGC at lower gain levels than could be handled with more conventional external-diode circuits. Voltage gain for Motorola MC1552 decreases from about 50 for 1-mA AGO control current to about 20 for 8 mA. For MC1553 high-gain video amplifier, gain drops from 400 at 1 mA to 25 at 8 mA.- A Wide Band Monolithic Video Amplifier, Motorola, Phoenix,AZ, 1973, AN-404 p 11.



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