開關(guān)電容濾波器的計算機輔助分析
COMPUTER-AIDED ANALYSIS OF SWITCHED-CAPACITOR FILTERS
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摘要: 開關(guān)電容濾波器(SCF)在集成電路中占有極為重要的地位,它具有集成度高,設(shè)計精度高,溫度穩(wěn)定性好,并可采用成熟的MOS工藝實現(xiàn)等優(yōu)點,為了提高電路設(shè)計的效率和準確性,計算機輔助分析受到越來越多的重視。 本文采用SPICE電路模擬程序和等效電路變換方法,討論了對SCF電路進行計算機輔助分析的步驟和方法,并用此方法設(shè)計了一個用于脈碼調(diào)制(PCM)電話系統(tǒng)的D3通道的五階橢圓低通濾波器,所得結(jié)果與傳輸函數(shù)結(jié)果一致。
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關(guān)鍵詞:
Abstract: The elementary unit of switched-capacitor (SC) network is composed of lossless integrator. According to charge conservation law, the lossless integrator can be equivalently transformed to two independent networks in z-domain. Introducing a storistor having a delay of one half switching period, the discrete time network in z-domain can be transformed to the continue time network in s-domain. Therefore if the circuit simulation program (such as SPICE) has time-delay elements, it is possible to design and analyze the SC network with computer. And a equivalent transformation process for lossless integrator is given. The result of computer analysis is also given. Using this method a five order ellipse lowpass SC filter is designed by SPICE program. -
周寧華,蔣建飛,電子科學技術(shù),10(1983), 1.[2]K. R. Laker, Bell Syst. Tech, J., 58(1979), 731.[3]C. F. Kurth and G. S. Moschytz, IEEE Trans. on CAS, CAS-26(1979), 756.[4]C. F. Kurth and G. S. Moschytz, ibid.,CAS-26(1979), 166.[5]B. Nelin, ibid.,CAS-30(1983), 43.[6]R. A. Friedenson, R. W. Daniels, R. J. Dow and P. H. McDonald, Bell Syst. Tech. J.,54(1975), 508.[7]M. S. Ghausi and K. R. Laker, Modern Filter Design, Englewood Cliffs, NJ: Prentice-Hall, 1980.[8]D. J. Allstot, R. W. Brodersen and P. R. Gray, IEEE J. of SC, SC-13(1978), 807.[9]Bingxin Wu and J. Mavor, Microelectronics J. 14(1983), 5. -
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