Light current reading circuit and self-adaption light intensity imaging array circuit and control method thereof

Abstract

The invention provides a light current reading circuit and a gain self-adaption light intensity imaging array circuit and a control method of the light current reading circuit and the self-adaption light intensity imaging array circuit, relates to the micro electronic technique, and solves the problems that the existing light intensity detection and automatic adjustment methods are inaccurate and slow. According to the technical scheme, the light current reading circuit is composed of a light current reading circuit, a variable gain reading circuit, an integrating capacitor resetting signal input end, a light intensity detection module, light intensity detection result reading switch modules, an integrating capacitor control end and a light intensity detection result output bus, wherein the variable gain reading circuit comprises an adjustable integrating capacitor module, the light intensity testing module comprises an integrating voltage comparison signal input end, at least one prestore comparison module, time delay units which are 1 less than the prestore comparison modules in number, and the light intensity testing result reading switch modules correspond to the number of prestore comparison modules. The light current reading circuit and the self-adaption light intensity imaging array circuit and the control method of the light current reading circuit and the self-adaption light intensity imaging array circuit have the advantage that quick and accurate light intensity test can be achieved, and are suitable for the light current reading circuit and the light intensity imaging array circuit.

Description

technical field [0001] The invention relates to microelectronic technology, in particular to an imaging system in microelectronic technology. Background technique [0002] The focal plane imaging array is widely used in scientific research, military and consumer electronics due to its low cost and high integration. The dynamic range of the imaging array refers to the highest light intensity and the lowest light intensity that the array can detect under a certain signal-to-noise ratio ratio of light intensity. The imaging array generally integrates the photocurrent signal generated by the photodetector on the integrating capacitor, and then outputs it in the form of voltage. The ratio of the pixel output voltage to the input photocurrent represents the gain of the pixel. Under strong light irradiation, the photocurrent is very large, and the integral voltage is easy to saturate. Increasing the upper limit of the detection range requires a slower integration speed; while unde...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the inaccurate and slow shortcomings of current light intensity detection and gain automatic adjustment methods, and provide a photocurrent readout circuit, adaptive light intensity imaging array circuit and its control method

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