MOS Switched capacitor automatic gain control circuit

Details MOS Switched capacitor automatic gain control circuit MOS Switched capacitor automatic gain control circuit

1985-09-10

1987-09-01

Mullins, James B.

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

330138, 330144, 330279, 330284, H03G 320

Patent

active

046911723

ABSTRACT:
An apparatus for adjusting the amplitude of an electronic signal to a predetermined level in a MOS integrated circuit device. A variable amplifier comprising a plurality of operational amplifier stages whose gain is controlled by capacitor ratios is utilized to amplify an input signal. The output of the variable amplifier is coupled to a comparator comprising a single operational amplifier to compare the output with a reference signal level corresponding to the desired output level of the circuit. The comparator generates an instruction signal to a flip-flop circuit and an up/down counter to provide digital control to the amplifier gain stages. The digital bits of the counter, depending on whether high or low, selectively switch the appropriate capacitors into operation to vary the gain of each operational amplifier stage.

REFERENCES:
patent: 3944942 (1976-03-01), Chudleigh, Jr.
patent: 3969683 (1976-07-01), Fabricius
patent: 4441082 (1984-04-01), Haque

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