具有混合反馈的高Q和/或高fs开关电容带通滤波器
HIGH Q AND/OR fs SC BANDPASS FILTER WITH MIXED-FEEDBACK
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摘要: 本文提出了一种减少电容分布和总电容的高Q和/或高fs开关电容(SC)带通滤波器。在传统的双二次SC滤波器结构中,引入部分正反馈并改变前馈网络可使总电容和电容分布得到大幅度的减少。举例说明了二阶高Q(=50)SC带通滤波器设计,并比较了不同滤波器结构的性能参数。
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Abstract: A design technique for realizing high Q and/or fs SC bandpass filters with reduced capa-citor spread and total capacitance is proposed. The significant reduction of capacitor spread and toul capacitance is achieved through introducing the partial positive feedback and changing the feed in capacitors in the conventional biquadratic SC filter structures. A design example of a second order high Q(=50) SC bandpass filter is given and a comparison of performance parameters among the different filter structures is given also. -
Z. X. Zhou, Proc. IEEE 1984 Int. Symposium on Circuits and Systems, p. 794.[2]M. S. Ghausi and K. R. Laker, Modern Filter Design: Active RC and Switched-Capacitor, Prentiee-Hall Inc., 1981.R. W. Broderson et al., Modern Active Filter Design, John Wiley and Sons Inc., 1981, p. 303.[3]J. S. Martinez and A. S. Sedra, Proc. IEEE 1982 Int. Symposium on Circuits and Systems, p. 373. -
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