Apparatus for providing continuous integration of an input signal while allowing readout and reset functions
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United States of America Patent
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Dec 28, 2004
Issued Date -
N/A
app pub date -
Jun 4, 2003
filing date -
Jun 5, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An integration circuit includes an input node for receiving an input charge, an integrator having an input terminal coupled to the input node, an output terminal and a first charge storage device coupled between the input and output terminals, an intermediate node coupled between the input terminal and ground, a second charge storage device having a first terminal coupled to the intermediate node and a second terminal coupled to an output node of the integration circuit and an isolation device coupled between the integrator and the second charge storage device for selectively isolating the integrator from the second charge storage device. During a first phase of operation, the isolation device is activated and isolates the integrator from the second charge storage device, and the input charge received on the input terminal of the integrator is stored on the first charge storage device. During a second phase of operation, the isolation device is deactivated and enables and the charge stored on the first charge storage device to be transferred to the second charge storage device.
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