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On a class of pseudo‐logarithmic amplifiers suitable for use with digitally switched resistors
Author(s) -
Maundy Brent,
Westwick David,
Gift Stephan
Publication year - 2007
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.402
Subject(s) - resistor , amplifier , electronic circuit , operational amplifier , current sense amplifier , logarithm , electronic engineering , electrical engineering , computer science , engineering , cmos , mathematics , voltage , mathematical analysis
This paper describes three circuits that implement pseudo‐logarithmic functions, which are simple and easy to implement. The circuits can be realized using operational amplifiers or current feedback amplifiers. Tuning can be achieved using switched resistors, or active resistors, or tunable transconductors, but are best suited for use with digitally switched resistors. Frequency response and stability considerations for two of the circuits are thoroughly discussed and PSPICE results confirming the theoretical results are presented alongside measured results. Copyright © 2007 John Wiley & Sons, Ltd.