Solid state image pickup device having feedback voltage to amplifier

Claim 1

A solid state image pickup device comprising: photoelectric conversion means for converting incident light to electric signals; a different circuit, one input terminal thereof being supplied with output signals from said photoelectric conversion means; an inverter circuit having at least one stage thereof serially connected to an output terminal of said differential circuit; negative feedback loop means for interconnecting an output terminal of a last stage of said inverter circuit and the other input terminal of said differential circuit through a switch means which is ON/OFF controlled at a predetermined timing, and for feeding back a signal at the output terminal of the last stage inverter circuit; and a grounding capacitor connected between a junction between said switch means and said other input terminal of said differential circuit and a grounding point the grounding capacitor holding an operating point voltage of a first stage of the inverter circuit at a voltage determined by said grounding capacitor by closing said switch means during a period prior to application of said output signal of said photoelectric conversion means.