Patent ID: 8431883

Claim:
A photoelectric conversion device comprising: a voltage detection circuit; and a photoelectric conversion circuit including: a photoelectric conversion element; a first transistor and a second transistor; a field effect transistor, and a buffer, wherein one of a source and a drain of the first transistor is directly connected to one of a source and a drain of the second transistor, wherein the first transistor is directly connected to the photoelectric conversion element, wherein the other of the source and the drain of the second transistor is directly connected to a drain and a gate of the field effect transistor, wherein the gate of the field effect transistor is configured to be electrically connected to the voltage detection circuit so as to detect a voltage of the gate of the field effect transistor, wherein a source of the field effect transistor is directly connected to the photoelectric conversion element, wherein the buffer is an operational amplifier, an output terminal of which is electrically connected to the voltage detection circuit and an inverting input terminal of the operational amplifier, and wherein a noninverting input terminal of the operational amplifier is electrically connected to the gate of the field effect transistor.