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Realizability constraints for third-order impedance-tapered allpole filters

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1 Author(s)
Moschytz, G.S. ; Swiss Federal Inst. of Technol., Zurich, Switzerland

It is shown that allpole filters of second- and third-order can be significantly desensitized to component tolerances by so-called impedance tapering, i.e., successively impedance-scaling upwards the L-sections of a resistance-capacitance ladder network in the forward and feedback path of a single-amplifier active filter. In order to obtain a realizable filter, certain constraints on the design equations must be observed. These constraints are derived here, and the resulting conditions necessary for the design of realizable third-order impedance tapered allpole filters are given

Published in:

Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on  (Volume:46 ,  Issue: 8 )

Date of Publication:

Aug 1999

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