Fast operating switchable operational amplifier driven circuits

Details Fast operating switchable operational amplifier driven circuits Fast operating switchable operational amplifier driven circuits

1980-04-18

1982-04-06

Dixon, Harold A.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328167, 307353, 330107, H03B 103, H03F 136

Patent

active

043237983

ABSTRACT:
Faster switching speeds for switchable noise filters and faster sampling speeds for sample and hold circuits are realized by means of an operational amplifier driven circuit in which excess feedback loop gain of the operational amplifier is used to reduce the effective value of resistance in the device's capacitor charging circuit. Two operational feedback loops are used, one or the other of which is switched into the circuit to effect either an open loop or a closed loop condition. The time required to charge the device's capacitor is a function of the ratio of the operational amplifier's closed loop gain divided by its open loop gain.

REFERENCES:
patent: 3516002 (1970-06-01), Hillis
patent: 3696305 (1972-10-01), Mitchell
patent: 3781697 (1973-12-01), Bruinshorst et al.
patent: 3919658 (1975-11-01), Friend
patent: 4210873 (1980-07-01), Suzuki et al.
patent: 4220875 (1980-09-01), Lawton

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