电流模式高阶滤波器设计的递推方法
THE DESIGN OF HIGHER ORDER CURRENT MODE FILTERS USING THE RECURSIVE APPROACH
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摘要: 给出了连续时间电流模式高阶滤波器的一种实现方法,该方法根据电流转移函数的分母多项式,以递推形式,逐步确定各个积分器的时间常数。用该方法设计所用电流镜数目少。对一个六阶滤波器的计算机仿真显示,该方法适合于设计高频电流模式滤波器。Abstract: A method for the design of continuous-time current-mode higher order filters is presented. It is based on the recursive derivation of the integrator s time constants step by step from the denominator of the current transfer function. Only a small number of current mirrors is needed using this approach. The computer simulations for a sixth-order filter reveal that the method proposed is suitable to the design of high-frequency current-mode filters.
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Hughes J B, Macbeth I C, Pattullo D M. Switched current filters. IEE Proc-G, 1990, 137(2): 156-162.[2]Toumazou C, Lidgeg F J, Haigh D G. Analogue IC Design: The Current-Mode Approach. London: Peter Peregrinue LTD, 1990, 1-296.[3]Lee S S, Zele R H, Allstot D J. CMOS continuous-time current-mode filters for high-frequency applications. IEEE J. of Solid-State Circuits, 1993, SC-28(3): 323-329.[4]Ramirez-Angulo J, Robinson M, Sanchez-Sinencio E. Current-mode continuous-time filters: Two design approaches. IEEE Trans. on CAS II: 1992, CAS-39(6): 337-341.[5]Ghausi M S, Laker K R. Modern Filter Design: Active RC and Switched Capacitor.Englewood Cliffs, NJ: Prentice-Hall, Inc.，1981, 325-342. -
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