Device and method for providing a reference signal

Details Device and method for providing a reference signal Device and method for providing a reference signal

2009-02-02

2011-11-08

Harrington, Alicia M (Department: 2873)

Television

Camera, system and detail

Solid-state image sensor

C348S241000

Reexamination Certificate

active

08054360

ABSTRACT:
A device that includes a pixel array and a sample and hold circuit configured to provide sampled current to the pixel array wherein the sample and hold circuit includes a first transistor, a capacitor and a pair of current mirrors. The pair of current minors are connected to the first transistor and wherein the capacitor is connected to a drain of the first transistor. The sample and hold circuit is configured to sample an input current during a sampling phase to provide a sampled current, wherein the sampling includes: providing the input current to the pair of current mirrors and allowing the capacitor to be charged to the capacitor voltage that is a function of the input current; store, during a hold phase, the capacitor voltage; wherein the capacitor voltage forces an output stage of the sample and hold circuit to output a current that is substantially equal to the sampled current; and utilize the pair of current mirrors to force the gate, source and drain voltages of the first transistor to be equal to each other during the hold phase.

REFERENCES:
patent: 2006/0077141 (2006-04-01), Kwon

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