Active and passive imaging readout circuit working at linear mode APD (Avalanche Photo Diode) array

Abstract

The invention relates to an active and passive imaging readout circuit working at a linear mode APD (Avalanche Photo Diode) array, which is provided with a detector, a short circuit protection circuit, an integral circuit, an integral time control circuit, an active and passive mode switching circuit, a sampling retaining circuit and a row selection circuit, wherein an output end of the detector is connected with an input end of the short circuit protection circuit, an output end of the short circuit protection circuit is connected with an input end of the integral circuit, an output end of the integral time control circuit is connected with an input end of the active and passive mode switching circuit, one output end of the active and passive mode switching circuit is connected with a control signal end of the integral circuit, the other output end of the active and passive mode switching circuit is connected with a control signal end of the sampling retaining circuit, an output end of the integral circuit is connected with an input end of the sampling retaining circuit, an output end of the sampling retaining circuit is connected with an input end of the row selection circuit, and an output end of the row selection circuit is connected with a follow-up signal processing circuit.

Description

technical field [0001] The invention relates to photoelectric imaging technology, in particular to an active and passive imaging readout circuit working in a linear mode APD array, belonging to the technical field of microelectronics and optoelectronics. Background technique [0002] Infrared focal plane array, named for the detector placed on the focal plane of the optical system, is the most active field of infrared technology development. The infrared focal plane array consists of two parts: an infrared detector and a readout circuit (Readout Circuit, ROIC), which are connected through indium columns, such as figure 1 shown. The working principle of the common infrared focal plane array is: after the infrared detector on the focal plane receives the incident infrared radiation, it generates a local charge related to the performance of the incident infrared radiation at the incident position of the infrared radiation, and scans the focal plane These charges are read out ...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the APD array readout circuit is not compatible with the active and passive imaging modes in the same system, and to provide a 320×256 large-scale imaging system that can switch between active and passive imaging and is suitable for working in linear mode. A kind of active and passive imaging readout circuit of APD array detector for large-scale APD array detector, so that the same APD array can provide passive and active detection capabilities as required, and for the active mode readout circuit, a device that can precisely control the integration time is designed The control circuit has the functions of high voltage protection and precise integral switch control

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