Bolometer infrared image sensor with an improved compensation circuit for compensating fixed pattern noise

摘要

An image sensor includes a plurality of pixels, each of which includes a bolometer infrared image sensor; a feed back circuit connected to the infrared image sensor for controlling at a constant value a current flowing through each the pixels of the infrared image sensor and for generating output voltage signals for each the pixels by apply the current controlled constant to each the pixels; detecting circuit connected to the feed back circuit for detecting variations in the resistance of each the pixels as fixed pattern noises based upon the output voltage signals from the feed back circuit to generate compensation signals which are to be fed back to the feed back circuit for feed-back control of the current flowing through the infrared image sensor.