On a class of pseudo-logarithmic amplifiers suitable for use with digitally switched resistors
✍ Scribed by Brent Maundy; David Westwick; Stephan Gift
- Publisher
- John Wiley and Sons
- Year
- 2008
- Tongue
- English
- Weight
- 631 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0098-9886
- DOI
- 10.1002/cta.402
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✦ Synopsis
Abstract
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.