A Logarithmic Response Ultra-High Speed ​​Infrared Focal Plane Pixel Readout Unit Circuit

Abstract

The invention discloses a logarithmic response ultra-high-speed infrared focal plane pixel readout unit circuit, which includes an operational amplifier, a subthreshold state MOS tube, a buffer stage and a storage unit array, and the output end of the operational amplifier is connected to the subthreshold state MOS tube. The gate terminal and the input of the buffer stage, the source terminal of the MOS transistor in the subthreshold state is connected to the negative input terminal of the operational amplifier and the input terminal of the detector, the drain terminal of the MOS transistor in the subthreshold state is connected to the bias voltage, and the positive terminal of the operational amplifier input is connected to the bias voltage. The output terminal of the buffer stage is connected to the input terminal of the memory cell array. The operational amplifier and the sub-threshold state MOS tube are connected in a negative feedback loop. The sub-threshold state MOS tube detects the photocurrent signal of the detector to realize the logarithmic transformation from the photocurrent signal to the sub-threshold state MOS gate-source voltage. The buffer stage will The logarithmic response voltage buffers the output, and the memory cell array stores the signal values ​​of the detector signal at different times sequentially at high speed, and has the measurement capability of ultra-high speed and extremely wide temperature range.

Description

A logarithmic response ultra-high-speed infrared focal plane pixel readout unit circuit technical field The present invention relates to a kind of infrared focal plane readout circuit, relate in particular to a kind of logarithmic response ultra-high-speed infrared focal plane Pixel readout unit circuit. technical background Ultra-high-speed (frame frequency or readout speed is higher than 1MHz) infrared detector has a high-speed infrared temperature measuring instrument. important application. At present, most of the infrared detectors used in high-speed infrared temperature measurement use unit devices or are composed of discrete unit devices. The formed line array or small area array detector is not an infrared focal plane detector in the strict sense. Linear device or less than 8*8 The high-speed area array detector can no longer meet the needs of high-speed measurement of temperature in a large area in two-dimensional direction in scientific experiments. To ...

AI Technical Summary

Problems solved by technology

On the one hand, in the integration mode, the signal obtained after integration is the response of the circuit to the total radiation energy within a period of time, and instantaneous temperature information cannot be obtained, so the traditional integration mode detector has instantaneous temperature measurement in principle. inaccurate question

[0005] Another reason is that in the integral mode, the output voltage of the circuit is linearly related to the input radiant energy, and according to Planck's radiation law, the radiant energy and the blackbody temperature have a 4th power relationship, so for the integral mode detector, When the target temperature rises, its output will increase sharply and quickly saturate, the temperature range that can be detected will be severely limited, and it cannot meet the temperature measurement application requirements of a wide temperature range

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