开关电容滤波器的计算机辅助分析
COMPUTER-AIDED ANALYSIS OF SWITCHED-CAPACITOR FILTERS
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摘要: 开关电容滤波器(SCF)在集成电路中占有极为重要的地位,它具有集成度高,设计精度高,温度稳定性好,并可采用成熟的MOS工艺实现等优点,为了提高电路设计的效率和准确性,计算机辅助分析受到越来越多的重视。 本文采用SPICE电路模拟程序和等效电路变换方法,讨论了对SCF电路进行计算机辅助分析的步骤和方法,并用此方法设计了一个用于脉码调制(PCM)电话系统的D3通道的五阶椭圆低通滤波器,所得结果与传输函数结果一致。
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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. -
周宁华,蒋建飞,电子科学技术,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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