Patent ID: 7920192

Claim:
A photoelectric conversion device comprising: a pixel region that includes a plurality of pixels, each pixel including a photoelectric conversion element, an amplifying MOS transistor configured to amplify a signal in response to electric charges of said photoelectric conversion element, a floating diffusion region electrically connected to a gate of said amplifying MOS transistor, and a transfer MOS transistor configured to transfer said electric charges to said floating diffusion region; and a peripheral circuit region, arranged outside of said pixel region, said peripheral circuit region including a plurality of MOS transistors configured to at least one of: drive said transfer MOS transistors and amplify signals read from said pixel region, said pixel region and said peripheral circuit region being located on a same semiconductor substrate, wherein an impurity concentration in said floating diffusion region is lower than an impurity concentration in a drain of a MOS transistor arranged in said peripheral circuit region.