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Uncooled infrared sensor readout circuit study

Author: HuangChao
Tutor: YuYueHui
School: Huazhong University of Science and Technology
Course: Microelectronics and Solid State Electronics
Keywords: Infrared sensor Sensitivity Readout circuit CMOS After the process
CLC: TP212
Type: Master's thesis
Year: 2011
Downloads: 62
Quote: 0
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Abstract


Uncooled infrared thermal imaging infrared sensor is in the field of research hotspot in the commercial, military , civil, and other fields have a wide range of applications . Among them, the diode type uncooled infrared sensor is a temperature-sensitive element to the PN junction , easily compatible with standard CMOS technology infrared sensor . Infrared sensors by standard CMOS process flow sheet after completion of pre- control circuit , but also need to go through dry etching and wet etching to complete the structure TMAH production, to achieve pixel diode -type floating structures released. Based on the research diode infrared sensor production process at the same time , the design of a small area of ??the pixel structure of the series . By varying the diode as the infrared sensor element structure , in series within the same area a plurality of small P / N -well unit , feel the outside of the sensor to improve the sensitivity of the infrared radiation . The use of simulation and experiment show that the structural design can well improve the infrared sensor output signal strength and sensitivity, effective solution to the IR sensor output signal is very weak problems and meet the needs of the actual test . While the design of a MOS transistor further amplified using the output signal of the circuit. As the IR sensor output signal voltage is small, must be designed to read the signal readout circuit . This infrared sensor signal characteristics for the design of a constant current source , including , amplification, filtering, read circuit modules . Using the simulation and the experiment had infrared sensor measuring the output signal of the heat source . Meanwhile, the use of FPGA development board and the ADC chip built infrared sensor data acquisition system. Study of the production process and the infrared sensor readout circuit for the infrared sensor focal plane is designed to provide a foundation for the study of infrared imaging technology will be able to play a facilitating role.

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