基于锁相环的遥感相机采样电路设计与优化

发布时间：2018-03-11 00:08

本文选题：时间延迟积分电荷耦合器件　切入点：时钟抖动　出处：《航天返回与遥感》2016年02期 　论文类型：期刊论文

【摘要】：高分辨率时间延迟积分电荷耦合器件(TDICCD)遥感相机成像系统设计中,通道数量、高频时钟品质、高速数据传输误码率与相机小型化设计已经成为相互制约的矛盾。目前,为了减小系统体积质量、提高图像信噪比,将采样电路放入相机主体的焦平面附近是目前遥感系统小型化的主要趋势。因此,在相机主体与图像处理器之间,高速数据传输和高速时钟抖动是采样电路的主要设计难题。文章设计了一套基于锁相环(PLL)的高速采样电路,抑制了高速时钟抖动,消除了相位差;设计了一种超前滞后滤波器作为锁相环电路的环路滤波器。通过仿真和实测分别得到了滤波器电路的相位裕度和锁定时间等参数;同时在电路板布局布线时,通过合理地切割地平面、优化时钟的走线,抑制了模数混合部分的量化噪声。电路中使用了串行传输技术实现高速大数据量的传输;最后,文章中对误码率和图像信噪比进行实测,测试结果满足实际工程应用的需求。该设计同传统采样电路相比较,在尺寸、质量、数据传输率、图像信噪比等方面均有较大优化。
[Abstract]:In the design of high resolution time delay integrated charge coupled device (TDICCD) remote sensing camera imaging system, the number of channels, the quality of high frequency clock, the bit error rate of high speed data transmission and the design of camera miniaturization have become a contradiction. In order to reduce the volume quality of the system and improve the signal-to-noise ratio of the image, the main trend of miniaturization of remote sensing system is to put the sampling circuit near the focal plane of the camera body. High speed data transmission and high speed clock jitter are the main problems in the design of sampling circuit. In this paper, a set of high speed sampling circuit based on PLL is designed, which can restrain the high speed clock jitter and eliminate the phase difference. A lead-lag filter is designed as a loop filter of phase-locked loop circuit. The parameters of phase margin and locking time of filter circuit are obtained by simulation and measurement respectively. By cutting the ground plane reasonably and optimizing the running of the clock, the quantization noise of the mixed analog and digital parts is restrained. The serial transmission technology is used to realize the transmission of high speed and large amount of data in the circuit. In this paper, the BER and SNR are measured, and the test results meet the requirements of practical engineering applications. Compared with the traditional sampling circuit, the design is optimized in dimension, quality, data transmission rate and image signal-to-noise ratio.
【作者单位】：北京空间机电研究所;
【基金】：国家重大科技专项工程
【分类号】：V445.8

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