A DC stabilized log-domain nth-order multifunction filter based on the decomposition of nth-order HP filter function to FLF topology

The design of high‐order log‐domain filters can be easily accomplished by transposing already known linear‐domain Gm‐C filter topologies to their counterparts in the log‐domain through the employment of a set of complementary operators. To achieve the Gm‐C filter topologies, the multiple feedback ap...

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Bibliographic Details
Published in:International journal of circuit theory and applications 2009-12, Vol.37 (10), p.1075-1091
Main Authors: Shah, N. A., Khanday, F. A.
Format: Article
Language:English
Subjects:
analogue integrated circuits
Automobiles
Automotive components
Automotive engineering
Automotive industry
Circuits
DC stabilized filters
Decomposition
follow-the-leader-feedback topology
high-order filters
log-domain filters
multifunction filters
multiple feedback filters
Simulation
Topology
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Summary:The design of high‐order log‐domain filters can be easily accomplished by transposing already known linear‐domain Gm‐C filter topologies to their counterparts in the log‐domain through the employment of a set of complementary operators. To achieve the Gm‐C filter topologies, the multiple feedback approach is widely used due to its accrued advantages. In this paper a synthesis approach for the development of an nth‐order multifunction log‐domain filter comprising lowpass (LP), highpass (HP) and bandpass (BP) filter functions is proposed. The approach is based on the decomposition of nth‐order HP filter function to follow‐the‐leader‐feedback (FLF) topology. The design is simple and simultaneously achieves nearly all of the chief advantages. The design offers superior performance factors vis‐à‐vis the ones recently reported. To verify the high‐order behavior of the topology, a 5th‐order multifunction filter was designed and the achieved simulated results verify the theory. Copyright © 2008 John Wiley & Sons, Ltd.
ISSN:0098-9886
1097-007X
DOI:10.1002/cta.533