Accession Number : ADD001067
Title : Electronic Gain Control.
Descriptive Note : Patent,
Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON D C
Personal Author(s) : Albrecht,Peter ; Bays,Kenneth L
Report Date : 26 Feb 1974
Pagination or Media Count : 6
Abstract : The patent describes an automatic gain control cricuit for varying the gain of an amplifier as a function of a separate control voltage. Feedback around the amplifier is varied independently from the amplifier output signal, changing the amplifier gain curve without changing the feedback control voltage therefor. Pulse-time modulation is used for feedback control with the pulse amplitude being proportional to the amplifier output and the pulse width a function of the control voltage. An electronic switch in the amplifier feedback path affords complete isolation between the driving voltage and the amplifier output signal. The switch is gated with a bistable multivibrator that is alternately triggered by pulses from a fixed pulse generator and pulses from a variable slope, ramp generator.
Descriptors : *Automatic gain control, *Patents, Amplifiers, Feedback
Subject Categories : Electrical and Electronic Equipment
Distribution Statement : APPROVED FOR PUBLIC RELEASE