| For low noise amplification and high speed A/D conversion of the low signal at the output of infrared detector, a set of low signal amplifying circuit (including the preamplifying circuit and the main amplifying circuit) and A/D conversion circuit based on medium wave infrared single detector is designed in this paper against the background of interferometric atmospheric spectral detection technology. It can be concluded from the Cadence/ORCAD simulation results that low signals can be amplified efficiently and converted from analog to digital acurately in this paper, which provides useful experience for future work.This paper mainly introduced low signal processing circuit of medium wave infrared unit for atmospheric spectral detection technology, including:1. The project background of this paper, the development situation and main research topics both in China and abroad are introduced after material investigation.2. The key technology of medium wave infrared single detector is deeply researched for later design, including enegy analysis and index allocation of interferometric atmospheric spectral detector, basic principle and specific circuit of low signal detection circuit3. The whole hardware circuit of signal detection circuit of medium wave infrared single detector designed, mainly including computation and photoelectric convertion of the incident energy of medium wave infrared single detector; design of differential preamplifying circuit and main amplifying circuit of the converted low signals and A/D convertion ciucuit.4. The noise analysis of the designed circuit mainly includes noise analysis modeling and nosie theory analysis to verify the correctness and efficiency of the designed circuit in the angle of theory.5. Compare the simulation results by Cadence/ORCAD with the theoretical results.Innovation points of this paper: the research of low signal processing circuit based on medium wave infrared single detector and other low signal detection circuit. |
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