IR focal plane readout circuit with offset cancellation

A technology of infrared focal plane and readout circuit, applied in the direction of electric radiation detector, etc., can solve the problems of affecting the working point, increase of power consumption and area, introduction of KTC noise, etc., to improve accuracy, reduce area, and reduce thermal noise Effect

Active Publication Date: 2017-12-26
JIANGSU R & D CENTER FOR INTERNET OF THINGS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages: The feedthrough effect generated by the reset pulse of the reset transistor will be coupled to the detector, thereby affecting the bias voltage of the detector and the operating point of the amplifier; due to the inclusion of the amplifier, its power consumption and area are increased, and KTC noise is introduced

Method used

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  • IR focal plane readout circuit with offset cancellation
  • IR focal plane readout circuit with offset cancellation
  • IR focal plane readout circuit with offset cancellation

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] Such as figure 1 As shown, the unit circuit of an uncooled infrared focal plane readout circuit includes sequentially connected: transconductance amplifier unit 3, transconductance output offset current elimination unit 4, integral amplification unit 5, buffer isolation unit 7, sample and hold unit 8 and a buffer output stage unit 9, the integral amplifier unit 5 is also connected to the integral capacitance selection unit 6.

[0026] Nodes A2 and A3 are the input nodes of the transconductance amplifier unit 3, and the output node is node A4. The transconductance amplifier unit 3 converts the voltage signal output by the diode array into a current signal for integral amplification by the integral amplifier unit 5.

[0027] The transconductance output offset current elimination unit 4 is connected to the node A4, and the transconductance output o...

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PUM

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Abstract

The invention relates to an infrared focal plane readout circuit with an offset elimination function, and the readout circuit includes: a level conversion unit, a two-phase non-overlapping clock generation unit, a bandgap reference current source unit, and a transconductance amplifier Unit, transconductance output offset current elimination unit, integral amplification unit with offset voltage elimination technology, integral capacitor selection unit, buffer isolation unit, sample hold unit, buffer output stage unit. The circuit of the present invention can be used to read out the small signal produced by the diode-type uncooled infrared focal plane array; by selecting different integral capacitance values ​​and changing the size of the bias current of the transconductance unit, the amplification factor and integration time of the signal can be adjusted, etc. , to meet the needs of different backgrounds; the invention also includes amplifier input stage offset voltage elimination technology and transconductance output current offset elimination technology, thereby improving the overall accuracy of the readout circuit.

Description

technical field [0001] The invention relates to an uncooled infrared focal plane readout circuit in an infrared imaging system, belonging to the technical field of weak signal detection. Background technique [0002] Infrared imaging technology has a long history and plays an irreplaceable role in related fields such as life, medical treatment, military and economy. Uncooled infrared focal plane array is the key technology in the new generation of infrared imaging system. Its appearance is infrared Imaging technology brings the advantages of low cost, long life, low power consumption, and high resolution. It consists of two parts: an infrared detector array and a readout circuit array. The infrared detector array is a device that converts the incident infrared radiation signal into an electrical signal output. It is the front end and the most important core part of the infrared thermal imaging system. The readout circuit is to process and display the signal sensed by the d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J5/10
Inventor 侯影黄卓磊王玮冰
Owner JIANGSU R & D CENTER FOR INTERNET OF THINGS
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