Television – Camera – system and detail – Combined image signal generator and general image signal...
Patent
1996-05-23
2000-02-15
Ho, Tuan V.
Television
Camera, system and detail
Combined image signal generator and general image signal...
327 90, H04N 5217
Patent
active
060258756
ABSTRACT:
An analog signal sampler with improved correlated double sampling (CDS) performance for imaging systems includes a dual mode input amplifier, a switched capacitor network and a differential amplifier. The dual mode input amplifier has a high input impedance and allows for receiving either positive-going contact image sensor (CIS) or negative-going charge couple device (CCD) image signals as desired. The switched capacitor network and differential amplifier together perform an improved CDS of the image signal and convert the unipolar input image signal to a bipolar differential output signal with an improved dynamic signal range. The CDS technique used relies upon simultaneous charging of the coupling and sample and hold capacitances with charge transfer from the coupling capacitance to the sample and hold capacitance. The gain of the sampler can be programmed by appropriate selection of the ratio of the coupling capacitance to the sample and hold capacitance.
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Brehmer Kevin Elmer
Vu Ha
Ho Tuan V.
National Semiconductor Corporation
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