| 摘要 |
An image sensor has pixels of four-transistor, pinned-photodiode type. In each pixel, the charge on a photodiode (22) is transferred by transfer gate (14) to a sensing node (Vpix). Readout of reset and read voltages is via an amplifier (36). A gain capacitor (Ch) is connected in feedback across the amplifier (36) and the read and reset gates are controlled such that the pixel is reset to a virtual ground voltage controlled by Ch and independent of the pixel parasitic capacitance (Cp). <IMAGE>
|
