Solid-state image sensor and electronic information device

Abstract

Provided are a solid-state image sensor and an electronic information device capable of effectively reducing the occurrence of pseudo-smear by adopting a simple configuration and operation. A solid-state image sensorincludes multiple pixel circuit units Pand P, each including a photoelectric conversion unit that generates charges via photoelectric conversion and accumulates the generated charges, a floating diffusion unit that retains charges transferred from the photoelectric conversion unit, a transfer unit through which charges accumulated by the photoelectric conversion unit are transferred to the floating diffusion unit, an output unit that outputs a signal corresponding to the amount of charges retained by the floating diffusion unit, and a reset unit that discharges charges retained by the floating diffusion unit to the outside; and an A/D conversion unitthat acquires a signal output from the output unit and performs A/D conversion on the acquired signal using a set gain. At least one of the pixel circuit units Pand Pis configured such that charges transferred from the photoelectric conversion unit to the floating diffusion unit and retained by the floating diffusion unit are limited so as not to exceed an upper limit amount which is set to be smaller by the extent of an increase in the gain.