Fast-recovery circuit

Details Fast-recovery circuit Fast-recovery circuit

1978-03-07

1979-04-03

Mullins, James B.

Amplifiers

With d.c. reinsertion circuit

328171, 330 85, 330110, H03F 2100

Patent

active

041479904

ABSTRACT:
An improved fast-recovery circuit for ECG amplifiers and the like. The fast-recovery circuit includes threshold responsive circuitry connected in parallel with part of the resistance associated with the integrator in a feedback circuit of the amplifier. The threshold responsive circuitry operates to increase feedback frequency response of the integrator when the normally very low frequency output signal of the amplifier exceeds a certain threshold. The improved circuit prevents the threshold circuitry from responding to pulses or excursions in the output signal of a relatively higher frequency content and which exceed the amplitude threshold for less than a predetermined interval, as for instance caused by pacer spikes, large QRS complexes and the like. Preferably, the improved threshold responsive means comprises transistor means connected across the integrator's resistance and having capacitance means across the base-emitter circuit thereof for inhibiting response to certain short duration signals.

REFERENCES:
patent: 3611174 (1971-10-01), Day

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