Pixel circuit

A pixel circuit, comprising:

• a front-end circuit, coupled to a common floating diffusion (FD) node, arranged to generate pixel signals, wherein the pixel signals comprises a photodiode signal and a reference signal;
• a signal storage circuit, coupled to the common FD node, arranged to store the photodiode signal and the reference signal generated by the front-end circuit, wherein when the pixel circuit is selected for performing a read-out operation, the photodiode signal and the reference signal stored in the signal storage circuit are pulled up from original voltage levels to other voltage levels higher than the original voltage levels according to a voltage increment applied to a control voltage of the signal storage circuit;
• and
• an output circuit, coupled to the common FD node, wherein when the pixel circuit is selected for performing the read-out operation, the output circuit generates output signals on an output terminal according to voltage levels of the common FD node, respectively.