PIXEL VOLTAGE REGULATOR
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United States of America Patent
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Issued Date -
Sep 10, 2020
app pub date -
Mar 6, 2020
filing date -
Mar 7, 2019
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Abstract
A pixel circuit wherein a pixel arrangement comprises a pixel comprising a photodetector, an integrator for accumulating a signal from the photodetector, a source following output transistor for amplifying the integrated signal, and a current source for applying a readout current through the output transistor, a voltage regulating circuit comprising an amplifier, a replica transistor dimensioned substantially the same as the output transistor, and a replica current source for providing substantially the readout current through each replica transistor, a gate of the replica transistor is connected with an output node of the amplifier connected with the pixel arrangement, and a source of the replica transistor is connected with a negative input of the amplifier, and with the replica current source, a predefined reference voltage is applicable to a positive input.
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