一種采用CDS技術(shù)的紅外讀出電路設(shè)計
[Abstract]:Infrared detection technology is more and more widely used in the fields of scientific detection, military affairs, medical treatment and so on. As a very important part of infrared detection system, the performance of infrared readout circuit is very important, and its noise performance determines the imaging quality of the system to a great extent, so it is very important to design low noise readout circuit. A linear infrared readout circuit using CDS technology is designed in this paper. In this paper, the noise of MOS tube, KTC noise and FPN noise in readout circuit are analyzed in detail, and the suppression effect of CDS technology on all kinds of noise is analyzed in detail. The pixel unit of the infrared readout circuit adopts CTIA structure to stabilize the detector bias, suppress the detector noise and improve the output linearity. In the column readout stage circuit, the CDS circuit is designed according to the characteristics of pixel cell noise. By optimizing the structure of the CDS circuit and the working sequence, the noise of the column readout stage sampling voltage is effectively reduced. In order to reduce the power consumption of the whole circuit, the dynamic tail current supply design is adopted. In addition, both the column operational amplifier and the output buffer adopt a five-tube amplifier structure with less noise to reduce the output noise of the circuit. The circuit and layout are designed and simulated based on CSMC 0. 5 渭 m CMOS process. The simulation results show that the circuit can work normally at the clock frequency of 5MHz, the output swing is 3.0V, the linearity is 99.5m and the power consumption of the single-row circuit is 0.257mW. at the same time, the performance of the above indexes is guaranteed. The output noise is 0.259 MV and the dynamic range is 81.2 dB, which meets the design requirements.
【學(xué)位授予單位】:東南大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:TN215
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