Design of signal processing circuit for 480×6 infrared detector

The principle and configuration of the signal processing circuit for 480times6 infrared detector is studied in this paper. The designed circuit consists of the analog processing circuit, the differential input analog to digital converting circuit and the digital data processing circuit. The analog processing circuit, including the impedance transformation circuit, the single-ended to differential circuit and the differential amplifying circuit, is for signal conditioning to meet the input range of the differential input analog to digital converting circuit. The data processing circuit implemented in FPGA achieves the functions such as nonuniformity correction, multiplexing 16 channels data, data rearrangement and timing control. The analog processing circuit is simulated and measured, and the data rearrangement method in FPGA data processing circuit is analyzed. Simulation and test results show that the design idea of the signal processing circuit for 480times6 infrared detector is reasonable and feasible.