Impedance readout circuit and method having filter for determining an AC current component inversely proportional to the output impedance of a pixel

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United States of America Patent

PATENT NO 9215392
APP PUB NO 20150304581A1
SERIAL NO

14257571

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Abstract

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An impedance readout circuit receives an input signal from a pixel, or an array of pixels. The circuit includes an amplifier to amplify the input signal and detects a DC component of the input signal. The circuit establishes an AC sampling voltage at the output of the amplifier enabling a filter of the circuit to determine an AC current component of the amplifier output. The AC current component is inversely proportional to the output impedance of the pixel.

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Patent Owner(s)

  • PALO ALTO RESEARCH CENTER INCORPORATED

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Lu, JengPing Fremont, US 72 438

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