CMOS image sensor anti-latch-up system based on space application

Abstract

CMOS image sensor anti-latch-up system based on space application, relates to a CMOS image sensor anti-latch-up system, which solves the problem that the CMOS image sensor in the existing space application is prone to latch-up, leading to device function failure or even burning, including external input Power supply, processing part and focal plane part, the external input power supplies power to the processing part and focal plane part at the same time; the processing part includes controller, current detection module, comparator, controller core power supply module, controller IO power supply module, controller peripheral Circuit power supply module, level conversion chipset and differential interface chipset; the focal plane part includes n sets of protection resistors, n sets of voltage conversion chips and reference source circuits; after the output voltage of the external input power supply is stable, each part is powered on in time to reduce DC The inrush current of the / DC module power supply system; the controller first has the core and then the IO and the last peripheral part, to avoid the output voltage falling during the rising process when all parts are powered on at the same time, and to ensure the stable and reliable power on of the controller.

Description

technical field [0001] The invention relates to an anti-latch system of a CMOS image sensor, in particular to an anti-latch system of a CMOS image sensor based on space applications. Background technique [0002] At present, compared with CCD image sensors, CMOS image sensors have the advantages of not requiring external drivers, analog-to-digital conversion circuits, small size and low power consumption, but they are prone to latch-up in space environment applications, resulting in device function failure or even burning. Low-dropout power supply chips such as MAX883 have a current-limiting protection function. When the voltage difference is greater than 0.7V and the output voltage is greater than 0.8V, the maximum output current is 430mA; when the output voltage is lower than 0.8V, the maximum output current is 170mA. However, the thermal protection function of the device at 160°C uses the principle that the conduction voltage of the PN junction of the transistor decreases...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a CMOS image sensor anti-latch-up system based on space applications to solve the problem that the CMOS image sensor in the existing space application is prone to latch-up, resulting in device function failure or even burning.

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