Operational track-and-hold amplifier
Patent 5130572 Issued on July 14, 1992. Estimated Expiration Date: 
December 26, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 26, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3838346 Differential sample-and-hold circuit Track-and-hold amplifier Sample-and-hold circuit Sampling and holding circuit for signal having low sampling residual component, especially for the dual sampling of a correlated signal given by a charge-transfer device Low distortion sample and hold circuit Patent #: 5015877 InventorsAssigneeApplicationNo. 633078 filed on 12/26/1990US Classes:327/96With differential amplifierExaminersPrimary: Mullins, James B.Attorney, Agent or FirmInternational ClassH03K 005/159AbstractA 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.Other References
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