單位元波開(kāi)關(guān)電容濾波器的新實(shí)現(xiàn)
NOVEL REALIZATION OF UNIT ELEMENT WAVE SWITCHED CAPACITOR FILTER
-
摘要: 本文給出了實(shí)現(xiàn)單位元波開(kāi)關(guān)電容濾波器適配器的幾個(gè)新電路。這些新適配器電路儀用一個(gè)單位增益器和一個(gè)兩相時(shí)鐘信號(hào),而且電路特性對(duì)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(duì)襯底的寄生電容和開(kāi)關(guān)的寄生電容)對(duì)電路特性的影響。分析表明,整個(gè)次寄生電容效應(yīng)表現(xiàn)為對(duì)反射系數(shù)的影響。通過(guò)調(diào)整一個(gè)電容,就可以把這種本來(lái)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(shí)現(xiàn)程控濾波器,可以有效地進(jìn)行實(shí)時(shí)語(yǔ)聲綜合。最后,給出了一個(gè)五階切比雪夫低通濾波器的例子。實(shí)驗(yàn)結(jié)果與理論相符。
-
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. -
計(jì)量
- 文章訪問(wèn)數(shù): 1580
- HTML全文瀏覽量: 87
- PDF下載量: 426
- 被引次數(shù): 0
下載:
