IMAGING APPARATUS AND IMAGING SYSTEM

摘要

An imaging apparatus includes a pixel that generates charge; an integral amplifier that integrates charge transferred from the pixel; a low pass filter to which output of the integral amplifier is supplied and whose time constant is variable; first and second sample-and-hold circuits that sample and hold output of the low pass filter before and after the charge is transferred from the pixel to the integral amplifier, respectively; a differential circuit that outputs a difference between signals held by the first and second sample-and-hold circuits; and a control circuit that changes the time constant. The control circuit decreases the time constant after the sampling by the first sample-and-hold circuit ends, and increases the time constant in the middle of the sampling by the second sample-and-hold circuit.

主权项

1. An imaging apparatus comprising:
a pixel that generates charge; an integral amplifier that integrates charge transferred from the pixel; a low pass filter to which output of the integral amplifier is supplied and whose time constant is variable; a first sample-and-hold circuit that samples and holds output of the low pass filter before the charge is transferred from the pixel to the integral amplifier; a second sample-and-hold circuit that samples and holds output of the low pass filter after the charge is transferred from the pixel to the integral amplifier; a differential circuit that outputs a difference between a signal held by the first sample-and-hold circuit and a signal held by the second sample-and-hold circuit; and a control circuit that changes the time constant of the low pass filter, wherein the control circuit decreases the time constant of the low pass filter after the sampling by the first sample-and-hold circuit ends, and increases the time constant of the low pass filter in the middle of the sampling by the second sample-and-hold circuit.