Readout circuit of uncooled infrared focal plane array

A focal plane array, uncooled infrared technology, applied in the field of infrared focal plane array, can solve the problems of large chip area, increase noise sources, etc., and achieve the effect of less noise sources and area saving

Inactive Publication Date: 2014-05-07
UNIV OF ELECTRONICS SCI & TECH OF CHINA
View PDF5 Cites 24 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the readout circuit of the prior art, the analog-to-digital conversion has nothing to do with the infrared detection itself
Also, due to the use of two reference microbolometers in each column readout channel, there is an added noise source in the circuit, which also adds a larger chip area

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Readout circuit of uncooled infrared focal plane array
  • Readout circuit of uncooled infrared focal plane array
  • Readout circuit of uncooled infrared focal plane array

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] The specific structure of the readout circuit of the uncooled infrared focal plane array of the embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0031] figure 1 It is a schematic structural block diagram of the readout circuit of the uncooled infrared focal plane array in one embodiment of the present invention.

[0032] Such as figure 1 As shown, in one embodiment of the present invention, a readout circuit of an uncooled infrared focal plane array includes a first bias circuit 10 , a second bias circuit 20 , a first integration circuit 30 and an analog-to-digital conversion circuit 50 .

[0033] In an embodiment of the invention, the first bias circuit 10 is connected to the detection microbolometer unit. In an uncooled infrared focal plane array, a plurality of detection microbolometer units are usually included, and these detection microbolometer units are arranged in an array to detect incident i...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The embodiment of the invention discloses a readout circuit of an uncooled infrared focal plane array. The readout circuit comprises a first bias circuit producing a detection output signal, a second bias circuit producing a first reference output signal, a first integration circuit and an analog-to-digital conversion circuit. The analog-to-digital conversion circuit includes a ramp signal generator which generates a ramp signal based on the output of a second reference microbolometer in a third bias circuit. According to the readout circuit, 'difference calculation' and 'amplification' of the detection output signal and the first reference output signal are completed by an integrator in an analog domain, 'ratio solution' is completed by an analog-to-digital converter in the process of analog-to-digital conversion, and analog-to-digital conversion and infrared detection are integrated more closely. Moreover, only one reference microbolometer is adopted in a column-level integrated readout channel, only one reference microbolometer is adopted in the chip-level ramp signal generator, and the readout circuit occupies a smaller area and has a smaller number of noise sources.

Description

technical field [0001] The invention relates to the technical field of infrared focal plane arrays, in particular to a readout circuit of an uncooled infrared focal plane array. Background technique [0002] The microbolometer infrared imaging system is a heat-sensitive infrared detector. If no special compensation method is used, the detection result is related to the substrate temperature. In actual use, it is hoped that the result of infrared detection is only related to the temperature of the detection target, and has nothing to do with other factors. [0003] A thermoelectric cooler (Thermo-Electric Cooler, TEC) is used in traditional uncooled microbolometer infrared imaging systems to achieve substrate temperature compensation. However, the TEC itself has a certain volume and power consumption, which affects the application of the uncooled infrared focal plane array detector to a certain extent, so people try to remove the TEC. However, the microbolometer infrared im...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G01J5/10G01J5/24
CPCH04N5/33H04N25/671G01J5/10G01J2005/106G01J5/22G01J5/20
Inventor 吕坚阙隆成周云魏林海
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap