CCD IMAGE SENSORS WITH VARIABLE OUTPUT GAINS IN AN OUTPUT CIRCUIT
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United States of America Patent
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Issued Date -
Mar 31, 2011
app pub date -
Sep 29, 2009
filing date -
Sep 29, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An output circuit in a charge-coupled device (CCD) image sensor includes a charge-to-voltage conversion region, a gain control transistor connected to the charge-to-voltage conversion region and a reset transistor connected in series with the gain control transistor. One or more additional gain control transistors can be connected between the reset transistor and the gain control transistor. The one or more gain control transistors are used to set a capacitance of the charge-to-voltage conversion region to two or more difference capacitance levels. For each capacitance level, a reset voltage and a signal voltage are measured from the charge-to-voltage conversion region. A signal processing device computes multiple signal values for a single charge packet using the measured reset and signal voltages. The signal processing device selects one of the multiple signal values to be the signal value for the pixel.
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