Signal quality stable output circuit of infrared detector

Abstract

The invention discloses a signal quality stable output circuit of an infrared detector. The signal quality stable output circuit comprises a main processor FPGA, a temperature acquisition circuit, a detector bias control circuit and a detector signal acquisition circuit; the temperature acquisition circuit acquires the working environment temperature of the infrared detector, digitalizes the temperature and sends the digitalized temperature to the main processor FPGA; the main processor FPGA updates a detector bias voltage working instruction according to the temperature acquired by the temperature acquisition circuit and sends the detector bias voltage working instruction to the detector bias voltage control circuit; the detector bias control circuit updates the working voltage VR and Vgpol of the infrared detector according to a detector bias working instruction. The detector signal acquisition circuit corrects an output analog image signal according to the working voltage VR and Vgpol of the infrared detector, digitizes the analog image signal and sends the digitized analog image signal to the main processor FPGA. Acquisition of the environment temperature is completed through the temperature acquisition circuit, the acquired temperature is used as guidance, prior information is read, the detector bias voltage is configured through the detector bias voltage control circuit,bias voltage real-time configuration is achieved, and image signal output is stabilized.

Description

technical field [0001] The invention belongs to the technical field of microelectronics and optoelectronics, and in particular relates to an infrared detector signal quality stable output circuit. Background technique [0002] Infrared imaging technology is a research hotspot in the world today both in military and civilian fields. Especially in the military field, due to the passive detection characteristics of infrared detection itself, it has good concealment and anti-interference ability. At the same time, due to the long detection distance and the ability to work day and night, infrared technology has been widely used in the military field. [0003] The infrared detector working power supply circuit and readout circuit are the core components of the infrared imaging system, which are used to provide the stable working voltage of the infrared detector and collect the output signal of the infrared detector. According to the working mechanism value of the detector, the be...

AI Technical Summary

Problems solved by technology

According to the working mechanism value of the detector, the beating of VR directly affects the reset of the integrating capacitor, resulting in abnormal output; at the same time, the change of the bias voltage of the photovoltaic diode will cause the beating of dark current, which will also lead to abnormal output

The actual military environment has to deal with different working conditions, so the dark current will also change with the change of temperature. At the same time, due to its process, materials and other reasons, the change of dark current is more obvious at different temperatures, showing different response characteristics. curve, the difference of this kind of curve under different integrals will be enlarged, and in severe cases, it will cause the detector to work abnormally

[0004] At present, most infrared detector power supply circuits only provide a stable capacitor reset voltage and photovoltaic diode bias voltage, which makes the NETD and non-uniformity of infrared detectors show great differences at different temperatures

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