Amplifier with fast recovery after input signal overswing

Details Amplifier with fast recovery after input signal overswing Amplifier with fast recovery after input signal overswing

1974-11-14

1976-02-03

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

330 20, 330 30R, 330 30D, H03F 368

Patent

active

039367312

ABSTRACT:
In a direct-coupled cascade of first and second amplifier stages respectively including first and second complementary-conductivity transistors, the collector electrode of the first transistor being connected to the base electrode of the second transistor, there is a delay in recovery of response to input signal after a sustained input signal overswing condition. This delay is obviated by direct coupling an auxiliary amplifier stage having a gain of relatively low amplitude and opposite sense as compared to the first amplifier stage, in parallel with the first amplifier stage. The auxiliary amplifier prevents the discharge of capacitances in the second amplifier stage when the conduction of the first transistor is cut off. Then, upon the resumption of conduction of the first transistor, no time is needed for re-charging the capacitances before the second transistor can be drawn back into conduction.

REFERENCES:
patent: 3560866 (1971-02-01), Haines
patent: 3571621 (1971-03-01), Hart et al.
"A Wideband Multiplier for Systems Design," Electronic Engineering, June 1972, pp. 18, 19. 50.

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