Patent ID: 8278613

Claim:
An image sensing apparatus having a pixel array with a plurality of pixels, comprising: a signal processing circuit for processing signals output from the pixel array; an amplification unit having a first input terminal and a second input terminal; a common readout line connected to the first input terminal of the amplification unit; and a reference level supply unit for supplying a reference level, wherein the signal processing circuit comprises: a plurality of column-readout circuits for reading the signals from the pixel array; a column-selection circuit for selecting the signals read by the plurality of column-readout circuits to be output to the common readout line; an input-side reset switch for resetting a level of the common readout line to the reference level; and column-selection switches for connecting the column-readout circuits associated with the signal selected by said column-selection circuit to the common readout line based on a signal from the column-selection circuit, the amplification unit amplifies a difference-voltage between a voltage level input to the first terminal corresponding to signals output from the pixel array and a reference voltage level supplied to the second input terminal, outputs a non-inverted output signal to a first output signal line, and outputs an inverted output signal to a second output signal line, a short-circuit switch short-circuits the first output signal line and the second output signal line in response to a reset signal, and the input-side reset switch resets a level of the common readout line using the reference level which is supplied to the common readout line through the column-selection switch.