| 摘要 |
An improved passive pixel sensor (PPS) circuit comprising a correlated sampling circuit and method that integrates pixel charge leakage onto an integrating amplifier during sampling periods. An integrator circuit is provided for integrating PPS pixel charges received via a column line, and correlated sampling circuit is provided for the removal of kTC noise and dark integration. A multi-point sampling of the output of the integrator is provided wherein at least a first and second correlated sample are used to detect the charge integration from the column line leakages, and at least a third sample is used to detect the PPS signal after pixel readout. The correlated sampling method is employed to remove kTC noise and dark integration from the PPS signal.
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