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Square-rooting and absolute function circuits using operational amplifiers
Author(s)
Kamsri, T.
Date Issued
April 20, 2009
Type
Article
Abstract
A method for implementing Square-rooting and absolute function circuits using operational amplifiers (opamps) as only active elements is introduced. The realisation technique is provided through the use of the opamp supply-current sensing, which utilises an inherently quadratic characteristic of the opamp class-AB output stage. The proposed circuits are attractive in terms of simple configuration and low cost. The performances of the circuits are discussed in detail. Experimental results demonstrating the characteristics of the circuits using commercially available opamps are also included. © 2009 The Institution of Engineering and Technology.
Citation
Iet Circuits Devices and Systems, 3(2), 57-63, 2009