Alternating current amplifier with digitally controlled frequenc

Details Alternating current amplifier with digitally controlled frequenc Alternating current amplifier with digitally controlled frequenc

1988-04-14

1989-09-19

Mullins, James B.

Amplifiers

Signal feedback

Variable impedance in feedback path varied by separate...

330 2, 330107, H03F 134

Patent

active

048685160

ABSTRACT:
An improved alternating current amplifier employs capacitive feedback to balance the intrinsic input capacitance, and a multiplier circuit responsive to a digital control signal coupled in the feedback path to vary the effective capacitance of the capacitive feedback. Thus, the frequency response of the amplifier may be adjusted and set digitally, such as under computer control, obviating the need to make manual adjustments to improve amplifier performance.

REFERENCES:
patent: 4481466 (1984-11-01), Roos et al.
Allstot et al., "An Electrically-Programmable Switched Capacitor Filter", IEEE J. of Solid-State Circuits, vol. SC-14, No. 6, Dec. 1979, pp. 1034-1041.
Bruton et al., "Time-Multiplexed Active Filters", IEEE J. of Solid-State Circuits, vol. SC-7, No. 3, Jun. 1972, pp. 259-265.

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