SAMPLING CIRCUIT HAVING ENHANCED NOISE FEATURE AND IMAGE SENSOR USING SAME

摘要

The sampling circuit for an image sensor of the present invention comprises: a first sample-and-hold circuit for converting at amplifying unit an electric charge generated from a photodiode, and sampling an outputted voltage output signal according to a first switching signal, charging same to a first capacitor, and outputting same as a reset voltage according to an output switching signal; a second sample-and-hold circuit for sampling the voltage output signal according to a second switching signal that is not activated at the same time as the first switching signal, charging same to a second capacitor, and outputting same as a signal voltage according to the output switching signal; and a low-pass resistor connected between common nodes of the amplifying unit, the first capacitor, and the second capacitor.