|発明の名称||A/D CONVERSION ARRAY AND IMAGE SENSOR|
PROBLEM TO BE SOLVED: To provide an A/D conversion array for an image sensor whose area and power consumption are reduced by reducing the number of amplifiers and capacitors (capacity) compared to that of a conventional cyclic type A/D conversion array and further providing a function of canceling noise generated at a pixel part of an image sensor.
SOLUTION: After an input signal Vin is applied to a C1 and held, a reset level is applied to the Vin and a difference signal is amplified at a radio (C1/C2) of the C1 and a C2 connected to an inverting amplifier. Then the output of the inverting amplifier is held and the output of the inverting amplifier is converted by a comparator from analog to digital; and a control signal is generated from the conversion output to turn on one of switches which are controlled with ϕM1, ϕO1, and ϕP1. A digital signal is converted into an analog signal, which is subtracted from the signal held in the C1. This signal is amplified, converted again from analog to digital, and the same operation is cyclically repeated. Consequently, noise cancellation and multi-bit A/D conversion are achieved.
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