Amplifier with modulated resistor gain control

Details Amplifier with modulated resistor gain control Amplifier with modulated resistor gain control

1988-12-05

1989-10-10

Mullins, James B.

Amplifiers

Signal feedback

Variable impedance in feedback path varied by separate...

330 84, 330137, 330282, H03G 320

Patent

active

048734926

ABSTRACT:
An automatic gain control circuit for an amplifier operating over a prescribed frequency range detects the output level of the amplifier; and couples a repeated predetermined waveform occurring at a rate greater than the reciprocal of twice the upper frequency of the prescribed frequency range to the output level signal. The waveform varying level signal is compared to a reference threshold to control the gain of the amplifier through a switched resistive elemement in the amplifier feedback path. The repeated waveform variations about the amplifier output level causes the value of the switched resistance to vary as a function of the output level. A low pass filter connected to the amplifier output removes switching transients resulting from the high frequency changes in the switched resistive element. The gains of a plurality of amplifiers may be determined by a common control for accurate tracking over a wide dynamic range.

REFERENCES:
patent: 4379272 (1983-04-01), Wheatley
patent: 4441082 (1984-04-01), Haque
patent: 4731590 (1988-03-01), Saari

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