High speed auto zero comparator

Details High speed auto zero comparator High speed auto zero comparator

1989-07-12

1990-10-09

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307355, 307491, 307494, H03K 524

Patent

active

049623230

ABSTRACT:
In accordance with the teachings of this invention, a novel auto-zero comparator is provided in which the on resistance of MOS switches serving as transfer gates used in the auto-zero mode to connect the output lead to the input lead is minimized without the need to increase the width to length ratio of the MOS switches. In accordance with the teachings of this invention, the on resistance of the transfer gates is reduced by reducing the threshold voltage of the transfer gates, which in turn is accomplished by making the bulk to source voltage of the transfer gates equal to zero. This is accomplished by utilizing a replica bias circuit which, during the auto-zero mode, replicates the voltage on the source of the transfer gates and applies this replica bias voltage to the bulk of the transfer gates.

REFERENCES:
patent: 3585510 (1971-06-01), O'Malley
patent: 3655996 (1972-04-01), Takahashi
patent: 4163947 (1979-08-01), Weedon
patent: 4417160 (1983-11-01), Schade, Jr.
patent: 4472648 (1984-09-01), Prentice
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patent: 4542305 (1985-09-01), Blauschild
patent: 4587443 (1986-05-01), van de Plassche
patent: 4665326 (1987-05-01), Domogalla
patent: 4725813 (1988-02-01), Miyada
patent: 4739192 (1988-04-01), Price, Jr.
patent: 4775807 (1988-10-01), Bukowski, Jr.
Pleshko et al., "MOS Transistor Electronic Stabilization of Thresholds," IBM Technical Disclosure Bulletin vol. 10, No. 3 Aug. 1967, pp. 336-337.

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