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Title: Amplifier with fast recovery after input signal overswing
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.
Other info: Inventors: Wheatley, Jr., Carl Franklin (Somerset, NJ, US) Application Number: 523742 Filing Date: 1974-11-14 Publication_date: 1976-02-03 Assignee: RCA Corporation (New York, NY) Primary Class(es): 330/255 330/288 Other Classes: US Patent Ref:
Other Refs: Other References: "A Wideband Multiplier for Systems Design," Electronic Engineering, June 1972, pp. 18, 19. 50. | |