| 摘要 |
A CMOS image sensor includes a photosensitive region for collecting charge in response to incident light; a charge-to-voltage mechanism for receiving the charge from the photosensitive region and converting the charge to a voltage; an amplifier for receiving and amplifying the voltage; a sample and hold circuit includes (i) a first capacitor one for receiving the voltage and a second capacitor for receiving a reset level; a first bus for receiving the voltage from the first capacitor and a second bus for receiving the reset level from the second capacitor; a differential difference amplifier for receiving the image voltage and the reset level and for determining a difference level between the image voltage and the reset level and for removing offset of the amplifier; and first and second switches respectively connected to the first and second bus for providing an electrical path for removing charge from each bus.
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