Operational track-and-hold amplifier

Details Operational track-and-hold amplifier Operational track-and-hold amplifier

1990-12-26

1992-07-14

Mullins, James B.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

H03K 5159

Patent

active

051305720

ABSTRACT:
A track-and-hold circuit that consists of an operational amplifer wherein the same capacitors are used for phase compensation and as differential holding capacitors. The circuit is switched from track to hold by turning off the input stage by reverse biasing base-emitter junctions through current steering in combination with resistor clamping. Low impedance during the hold mode is maintained because one half of the differential compensation path is connected to the output. Feed-through is eliminated by cascoding the first stage and turning off the cascode devices through current steering with resistor clamping during the holding mode. The holding capacitors' droop due to bias currents is minimized by current cancellation of the second stage.

REFERENCES:
patent: 3838346 (1974-09-01), Cox
patent: 4370572 (1983-01-01), Cosand et al.
patent: 4779012 (1988-10-01), Moscovici
patent: 4806790 (1989-02-01), Sone
patent: 4845382 (1989-07-01), Eouzan et al.
patent: 5015877 (1991-05-01), King
Delarue et al., "Control Circuit for Sample-and-Hold Devices", IBM Technical Disclosure Bulletin, vol. 19, No. 11 Apr. 1977, pp. 4211, 4212.

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