Patent ID: 8063964

Claim:
An image sensor circuit comprising: at least one pixel circuit comprising: a photodetector; a transfer transistor connected to the photodetector and a first supply bus; a reset transistor connected to the transfer transistor and a second supply bus; an amplifier transistor connected to the transfer transistor, the reset transistor, and a third supply bus; a signal readout transistor connected to the amplifier transistor and a signal bus; and a dual sensitivity selection and support circuit comprising: a high sensitivity enable transistor connected to the signal bus; a standard sensitivity enable transistor connected to the signal bus; a correlated double sampling switch transistor connected to the signal bus; a correlated double sampling capacitor connected in series with the signal bus, between the standard sensitivity enable transistor and the correlated double sampling switch transistor; a high sensitivity switch transistor connected to the third supply bus; and a standard sensitivity switch transistor connected the to the third supply bus; wherein a high sensitivity mode signal is read out from the photodetector during a high sensitivity mode, and a standard sensitivity mode signal is read out from the photodetector during a standard sensitivity mode, and wherein the high sensitivity enable transistor and the high sensitivity switch transistor are enabled to select a high sensitivity mode for low lighting conditions, and the standard sensitivity enable transistor and the standard sensitivity switch transistor are enabled to select a standard sensitivity mode for standard lighting conditions.