單位元波開關(guān)電容濾波器的新實現(xiàn)
NOVEL REALIZATION OF UNIT ELEMENT WAVE SWITCHED CAPACITOR FILTER
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摘要: 本文給出了實現(xiàn)單位元波開關(guān)電容濾波器適配器的幾個新電路。這些新適配器電路儀用一個單位增益器和一個兩相時鐘信號,而且電路特性對主寄生電容效應(yīng)極不敏感。文中還分析了次寄生電容(包括電容器上極板對襯底的寄生電容和開關(guān)的寄生電容)對電路特性的影響。分析表明,整個次寄生電容效應(yīng)表現(xiàn)為對反射系數(shù)的影響。通過調(diào)整一個電容,就可以把這種本來就很小的影響降至更小。另外,本文的電路還非常適合用于實現(xiàn)程控濾波器,可以有效地進行實時語聲綜合。最后,給出了一個五階切比雪夫低通濾波器的例子。實驗結(jié)果與理論相符。
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關(guān)鍵詞:
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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