Direct-coupled cascade amplifier with automatically adjusted qui

Details Direct-coupled cascade amplifier with automatically adjusted qui Direct-coupled cascade amplifier with automatically adjusted qui

1977-01-21

1978-01-10

Mullins, James B.

Amplifiers

With periodic switching input-output

330 51, 330253, 330261, H03F 102, H03F 3185, H03F 345

Patent

active

040681823

ABSTRACT:
A cascade amplifier embodying the present invention includes a plurality of amplifier stages in direct-coupled cascade connection. During specified intervals interspersed with normal amplification equal potentials are imposed on the inverting and non-inverting terminals of the first amplifier stage. A direct-coupled feedback connection from the output port of the final amplifier stage to the input port of one of the amplifier stages succeeding the first includes a sample-and-hold circuit. This sample-and-hold circuit samples the signal level appearing at the output port of the final amplifier stage during said specified intervals and holds that level for the feedback connection during the intervening periods of normal amplification to provide continuing compensation against input offset potential error.

REFERENCES:
patent: 3237116 (1966-02-01), Skinner et al.
patent: 3988689 (1976-10-01), Ochi et al.
Hellwarth et al., "Automatic Zero-Correction Amplifier", IBM Technical Disclosure Bulletin vol. 15, No. 1, June 1972, pp. 140-141.

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