单位元波开关电容滤波器的新实现
NOVEL REALIZATION OF UNIT ELEMENT WAVE SWITCHED CAPACITOR FILTER
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摘要: 本文给出了实现单位元波开关电容滤波器适配器的几个新电路。这些新适配器电路仪用一个单位增益器和一个两相时钟信号,而且电路特性对主寄生电容效应极不敏感。文中还分析了次寄生电容(包括电容器上极板对衬底的寄生电容和开关的寄生电容)对电路特性的影响。分析表明,整个次寄生电容效应表现为对反射系数的影响。通过调整一个电容,就可以把这种本来就很小的影响降至更小。另外,本文的电路还非常适合用于实现程控滤波器,可以有效地进行实时语声综合。最后,给出了一个五阶切比雪夫低通滤波器的例子。实验结果与理论相符。
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Abstract: In this paper some novel adaptor circuits are proposed to realize the unit element wave switched eapacitor filters driven by two phase clock signals. These circuits are very insensitive to the bottom plate parasitic capacitanees. To realize an adaptor only one unit-gain buffer is needed. The effects of top plate parasitie capacitanees and switch parasitic capacitanees on the adaptor are analyzed. The results show that the effects of the parasitics are small and can be reduced further by changing only one of the capacitances. These circuits are adaptable for realizing programmable filters and very useful to the PLC real-time speech synthesis. As an example, a 5th order unit element low-pass filter is given. The experimental results are in good agreement with the theoretical ones. -
U. Kleine, D. Herbst, B. Hoefflinger, B. J. Hosticka and R. Schweer, Electron. Lett.,17(1981),600.[2]K. Martin, IEEE Trans, on CAS,CAS-30(1983), 462.[3]J. Mavor, H. M. Reekie, P. B. Denyer, S. O. Scanlan and T. M. Curran, IEEE J.of SC, SC-16(1981), 716.[4]A. Fettweis, Arch. Elektr. Ubertr., 25(1971), 79.[5]R. Levy, IEEE Trans. on MTT, MTT-13(1965), 514. -
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