級聯(lián)開關電流濾波器設計
SWITCHED-C URRENT FILTER DESIGN USING CASCADED SECTIONS
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摘要: 本文提出了一種新的有源器件開關電流運算放大器(SIOA)。新元件的引入大大減化了電路的作圖,十分便于開關電流(SI)電路的分析和綜合。以開關電容(SC)電路為原型,導出了若干新的全極點和橢圓(二階或三階)SI電路。這些電路既可作為濾波節(jié)單獨使用,也可用于級聯(lián)設計以實現(xiàn)高階轉(zhuǎn)移函數(shù)。為了說明設計方法,給出了一個五階SI低通濾波器設計例子。
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關鍵詞:
- 電路理論和設計; 開關電流; 有源濾波器
Abstract: A new analogue sampled-data active device, called as a switched-current operational amplifier (SIOA), is presented. The use of the active element may simplify drawing the circuit diagram greatly and may permit easier analysis and synthesis of SI networks. A number of all pole and elliptic (second or third order) switched current (SI) circuits are derived from the switched capacitor prototypes. These can be used as simple self-contained filters or as filter sections in the cascade realizations of a higher order transfer functions. To illustrate the design approach, a fifth-order lowpass filter is presented. -
J. B. Hughes et al., Switched current--A new technique for analogue sampled-data signal processing,[2]IEEE ISCAS, Portland, USA, (1989), pp. 1584-1587.[3]J. B. Hughes et al., IEE Proc.-G, 137(1990)2, 156-162.[4]J. B. Hughes et al.,Electron. Lett., 26(1990)11, 694-695.[5]T. S. Fiez, D. Allstot, IEEE J. of SC, SC-25(1990)6, 1360-1367.[6]R. Gregorian, IEEE Trans. on CAS, CAS-27(1980)6, 515-521.[7]吳杰,開關電容網(wǎng)絡的研究,湖南大學,碩士論文,長沙,1985年. -
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