级联开关电流滤波器设计
SWITCHED-C URRENT FILTER DESIGN USING CASCADED SECTIONS
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摘要: 本文提出了一种新的有源器件开关电流运算放大器(SIOA)。新元件的引入大大减化了电路的作图,十分便于开关电流(SI)电路的分析和综合。以开关电容(SC)电路为原型,导出了若干新的全极点和椭圆(二阶或三阶)SI电路。这些电路既可作为滤波节单独使用,也可用于级联设计以实现高阶转移函数。为了说明设计方法,给出了一个五阶SI低通滤波器设计例子。
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关键词:
- 电路理论和设计; 开关电流; 有源滤波器
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]吴杰,开关电容网络的研究,湖南大学,硕士论文,长沙,1985年. -
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