Voltage comparator

Details Voltage comparator Voltage comparator

1997-11-13

1999-05-04

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327562, H03K 522

Patent

active

059007486

ABSTRACT:
In a voltage comparator of the present invention, across a gate and a source of an amplifier transistor, a phase compensating capacitor and a first switch circuit are connected with each other in series, and a second switch circuit for short-circuiting the phase compensating capacitor is provided. The second switch circuit is turned on when the first switch circuit is turned off so as to (1) short-circuit the phase compensating capacitor and (2) discharge the phase compensating capacitor which has been charged while the first switch circuit was turned on. This permits to completely turn off the first switch circuit, and to prevent distortion of an output signal outputted from an output terminal, thereby preventing accumulation of unnecessary charges in the phase compensating capacitor.

REFERENCES:
patent: 4703249 (1987-10-01), De La Plaza
patent: 4763021 (1988-08-01), Stickel
patent: 4868483 (1989-09-01), Tsujimoto
patent: 4930112 (1990-05-01), Tanaka
patent: 5061862 (1991-10-01), Tamagawa
patent: 5063304 (1991-11-01), Iyenger
Gregorian, et al; A Continuously Variable Slope Adaptive Delta Modulation Codec System; IEEE Journal of Solid-State Circuits, vol. SC-18, No. 6; Dec. 1983; pp. 692-700.

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