電流模式高階濾波器設(shè)計(jì)的遞推方法
THE DESIGN OF HIGHER ORDER CURRENT MODE FILTERS USING THE RECURSIVE APPROACH
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摘要: 給出了連續(xù)時(shí)間電流模式高階濾波器的一種實(shí)現(xiàn)方法,該方法根據(jù)電流轉(zhuǎn)移函數(shù)的分母多項(xiàng)式,以遞推形式,逐步確定各個(gè)積分器的時(shí)間常數(shù)。用該方法設(shè)計(jì)所用電流鏡數(shù)目少。對(duì)一個(gè)六階濾波器的計(jì)算機(jī)仿真顯示,該方法適合于設(shè)計(jì)高頻電流模式濾波器。
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關(guān)鍵詞:
- 電流模式濾波器; 有源濾波器; 轉(zhuǎn)移函數(shù); 電流鏡
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. -
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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