【摘要】 本文介绍了时分复用延迟线可控二阶递归滤波器组的工作原理,得出了与理论计算相吻合的实验结果,讨论了实现同一种算法的两种结构,还估计了由数模乘法器(MDAC)系数误差引起的滤波器中心频率和带宽的变化。此外,在考虑环路增益、不完全转移效率和延时线结构中单元数目的情况下详细讨论了滤波器的窜扰,并提出了克服窜扰的一种措施。最后还介绍了改进波器组的性能。更多还原

【Abstract】 A type of programmable Doppler filter bank using second-order recursive implementation with charge-coupled devices (CCD) as delay lines is developed for application to Radar MTD system. The agreement between measurements and theoretical calculations is encouraging. Two kinds of configuration which give the same algorithm are discussed. Errors in center frequency and bandwidth of the filter which arise from the accuracy of the MDAC coefficients are evaluated. In addition, a detailed account of the Smear effect caused by imperfect CTE as a function of loop gain, transfer inefficiency and number of transfers is developed, and a technique reducing Smear is suggested. The performance of modified filter-banks is introduced.更多还原