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On the transposition of G m – C filters to DC stabilized log‐domain filters
Author(s) -
Psychalinos Costas
Publication year - 2006
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.349
Subject(s) - transposition (logic) , network topology , offset (computer science) , topology (electrical circuits) , filter (signal processing) , mathematics , control theory (sociology) , computer science , combinatorics , geometry , control (management) , artificial intelligence , computer vision , programming language , operating system
High‐order log‐domain filters could be designed by transposing the already known linear‐domain G m – C filter topologies to the corresponding topologies in the log‐domain. This is achieved by using a non‐linear transconductor configuration, where the output current is exponentially related to its input and output voltages. A drawback of the non‐linear transconductor configuration already introduced in the literature is that a number of the transposed log‐domain filter topologies suffer from DC instability, while in some others a DC offset current appears at their output. In order to eliminate the aforementioned problems a modified non‐linear transconductor configuration for transposing G m – C filter topologies to log‐domain filter topologies is introduced in this paper. The achieved improvements are demonstrated through a number of log‐domain filter configurations derived using the already introduced and the proposed transposition schemes. Copyright © 2006 John Wiley & Sons, Ltd.