Track and hold circuit
Patent 5315170 Issued on May 24, 1994. Estimated Expiration Date: 
June 23, 2012. 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.
June 23, 2012. 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 ReferencesTrack and hold amplifier Operational track-and-hold amplifier Patent #: 5130572 InventorsAssigneeApplicationNo. 902603 filed on 06/23/1992US Classes:327/94Sample and holdExaminersPrimary: Zazworsky, JohnAttorney, Agent or FirmForeign Patent References
International ClassG11C 027/02AbstractA track and hold circuit for producing an output voltage having a level related to the voltage level of an input voltage fed to the circuit during a track mode and for maintaining the level of the output voltage constant during a hold mode. The circuit includes a current source and a capacitor with the capacitor being charged with the current or discharged selectively in accordance with the level of the input voltage relative to the level of the output voltage to produce at the capacitor the voltage related to the voltage level of the input voltage. Current from the current source is directed away from the capacitor during the hold mode in order to reduce the effect of charge stored during the track mode from slowing the transition from track mode to hold mode operation.Other References
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