Circuit for dynamic control of phase shift

Details Circuit for dynamic control of phase shift Circuit for dynamic control of phase shift

1974-10-21

1976-07-13

Mullins, James B.

Amplifiers

Signal feedback

Amplifier in signal feedback path

330 21, 330 31, 330107, H03F 134

Patent

active

039696820

ABSTRACT:
A current controlled variable transconductance amplifier having a differential input stage and a current source output stage is employed with negative feedback, either through a buffer amplifier or directly, to provide various all-pass, low-pass or high-pass filter configurations, each with controlled bias current to the differential input stage for current control of the variable transconductance amplifier to provide dynamic control of phase shift and filter cutoff frequency.

REFERENCES:
patent: 3701037 (1972-10-01), Holsinger
patent: 3715678 (1973-02-01), Rekhard
patent: 3786363 (1974-01-01), Lelie
patent: 3789313 (1974-01-01), Sanderson
patent: 3792367 (1974-02-01), Fleischer et al.
patent: 3805091 (1974-04-01), Colin
"Controlled Active RC Filter Circuitry Gives Lab Unit Wide Applications," Electronic Design 3, Feb. 1, 1967, pp. 110, 112.

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