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International Journal of Electronics, Vol. 92, No. 8, August 2005, 473477
 

Summary: International Journal of Electronics,
Vol. 92, No. 8, August 2005, 473­477
A current conveyor-based relaxation oscillator as a versatile electronic
interface for capacitive and resistive sensors
MUHAMMAD TAHER ABUELMA'ATTI* and MUNIR AHMAD AL-ABSI
King Fahd University of Petroleum and Minerals, Box 203, Dhahran 31261, Saudi Arabia
(Received 1 December 2004; in final form 29 January 2004)
A new electronic interface circuit is presented. The circuit is built around a single
plus-type second-generation current conveyor (CCIIŝ) and can be used with
resistive, capacitive and resistive-capacitive sensors. Experimental results are
provided.
Keywords: Current conveyor; Relaxation oscillator; Interface for sensors
1. Introduction
Oscillators are widely used as electronic interface for sensors (Filanovsky 1994).
This is attributed to their simplicity and immunity to electromagnetic interference
(Pallas-Areny and Webster 1991). While harmonic oscillators, widely used with
capacitive and inductive sensors, have a very high sensitivity due to their resonant
nature, relaxation oscillators are simpler and less sensitive (Pallas-Areny and
Webster 1991). This explains the growing interest in designing relaxation oscillators
using operational amplifiers (Passeraub et al. 1997, Liu et al. 2000, Nihtianov et al.

  

Source: Al-Absi, Munir A. - Electrical Engineering Department, King Fahd University of Petroleum and Minerals

 

Collections: Engineering