A Dual Transformation Approach to Current-Mode Filter Synthesis

WANG Guo-Hua  Kenzo WATANABE  Yutaka FUKUI  

IEICE TRANSACTIONS on Electronics   Vol.E75-C   No.6   pp.729-735
Publication Date: 1992/06/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electronic Circuits
dual transformation,  current-mode,  filter,  active RC and SC circuits,  

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A dual transformation incorporating the frequency-dependent scaling factor with the impedance dimension is proposed to synthesize the current-mode counterpart of a voltage-mode original. A general class of current-mode active-RC biquadratic filters and a switched-capacitor low-pass biquad are derived to demonstrate the synthesis procedure. Their simulation and test results show that the current transfer functions are the same as the voltage transfer functions of the originals, and thus confirm the validity of the procedure. The dual trasformation described herein is general in that with the scaling factor chosen appropriately it can meet a wide variety of circuit transformation, and thus useful also for circuit classification and identification.