Photoelectric conversion device comprising a current mirror circuit connected to a field effect transistor, a buffer and a voltage detection circuit

摘要

It is an object to provide a photoelectric conversion device which can solve the problem of leakage current or noise caused when the photoelectric conversion device is connected to an external circuit by amplifying the current flows through the photoelectric conversion element, and which can widen dynamic range of the output voltage which is obtained in accordance with the current flowing through the photoelectric conversion element. The photoelectric conversion device includes a voltage detection circuit, and a photoelectric conversion circuit including a photoelectric conversion element, a current mirror circuit, and a field effect transistor. The current mirror circuit is a circuit which amplifies and outputs a photocurrent generated at the photoelectric conversion element. The voltage detection circuit is connected to the gate terminal of the field effect transistor so as to detect generated voltage.