具有混合反饋的高Q和/或高fs開關(guān)電容帶通濾波器
HIGH Q AND/OR fs SC BANDPASS FILTER WITH MIXED-FEEDBACK
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摘要: 本文提出了一種減少電容分布和總電容的高Q和/或高fs開關(guān)電容(SC)帶通濾波器。在傳統(tǒng)的雙二次SC濾波器結(jié)構(gòu)中,引入部分正反饋并改變前饋網(wǎng)絡(luò)可使總電容和電容分布得到大幅度的減少。舉例說明了二階高Q(=50)SC帶通濾波器設(shè)計,并比較了不同濾波器結(jié)構(gòu)的性能參數(shù)。
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關(guān)鍵詞:
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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