| Readout circuit with nonuniformity correction for the uncooled microbolometer |
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| 作者姓名： | 孟丽娅 |
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| 作者单位： | Key Laboratory |
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| 摘 要： | 1 Introduction 1 With progress of technologies, uncooled microbolometer (UMB) is a viable alternative to many cooled IRFPAs (Infrared Focal Plane Arrays) because of its low manufacture cost, low power consumption, light weight and acceptable performance. One of the major problems in the readout circuit design of the microbolometer is the wide dynamic range of the interface circuit caused by serious nonuniformity. The nonuniformity, also referred as spatial noise, is a result of fabricatio…
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| 关 键 词： | 辐射测量仪 读数器 放大器 CMOS |
Readout circuit with nonuniformity correction for the uncooled microbolometer |
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| MENG Li-y,YUAN Xiang-hui,LU Guo-lin,HUANG You-shu.Readout circuit with nonuniformity correction for the uncooled microbolometer[J].Journal of Chongqing University,2005,4(2):67-69. |
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| Authors: | MENG Li-y YUAN Xiang-hui LU Guo-lin HUANG You-shu |
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| Abstract: | The output of uncooled microbolometer is nonuniform, and the traditional two-point nonuniformity correction method requires a tight restriction on substrate temperature. The circuit proposed by this article can relax the restriction on the substrate temperature and perform nonuniformity correction when reading out the image signal. The dummy pixels reduce static current. And the Column shared DACs transfer correction data to the gates of MOS transistors and the positive reference edge of amplifier, to control the bias current of detector and dummy one, and set the start point of integration. This circuit has higher sensitivity, wider dynamic range, and frame frequency of more than 30 Hz for 128×128 array. PSPICE simulation results seem that this circuit functions well. |
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| Keywords: | microbolometer Capacitive Transimpendence Amplifier (CTIA) CMOS readout circuit microbolometer nonuniformity correction PSPICE simulation results functions array frame frequency dynamic range sensitivity start point integration control bias detector Column shared DACs transfer |
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