Operational track-and-hold amplifier
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United States of America Patent
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-
Jul 14, 1992
Grant Date -
N/A
app pub date -
Dec 26, 1990
filing date -
Dec 26, 1990
priority date (Note) -
Expired
status (Latency Note)
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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.
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