Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Reexamination Certificate
2006-01-31
2006-01-31
Nguyen, Minh (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
C327S337000, C341S122000
Reexamination Certificate
active
06992509
ABSTRACT:
A switched-capacitor sample/hold circuit and method having reduced slew-rate and settling time requirements provides for lower-cost and/or lower-power implementation of sample/hold circuits and/or reduced error due to amplifier characteristics. The switched-capacitor sample/hold circuit incorporates a pair of capacitors that are alternatively and mutually-exclusively switched between an input sample position and an amplifier hold position, providing a dual sampled amplifier output signal that has reduced transitions at each sample interval. An alternative embodiment of the sample/hold circuit incorporates a fully-differential amplifier having a differential input and a differential output. Four capacitors are employed forming two of the dual sampled switched-capacitor circuits, one in each negative feedback path (inverted output to non-inverting input, non-inverted output to inverting input) of the amplifier. The two dual sampled switched-capacitor circuits are referenced to each other, providing fully differential operation and cancellation of error due to charge injection.
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patent: 6137321 (2000-10-01), Bazarjani
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patent: 6636084 (2003-10-01), Sarraj
Ko Terasuth
Wong Chi Chun
Moy Jeffrey D.
Nguyen Minh
Supertex Inc.
Weiss Harry M.
Weiss, Moy & Harris P.C.
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