A Proposed Resistance-to-Time Converter with Switching Impulse Calibrators for Application in Resistive Bridge Sensors

M. Zahangir (British Malaysian Institute University of Kuala Lumpur)
Sheroz Khan (International Islamic University of Malaysia)
I. Adam (British Malaysian Institute University of Kuala Lumpur)
K. Abdul Kadir (British Malaysian Institute University of Kuala Lumpur)
A. N. Nordin (International Islamic University of Malaysia)
S. N. Ibrahim (International Islamic University of Malaysia)

Indonesian Journal of Electrical Engineering and Computer Science
Vol 11, No 1: July 2018

This paper presents a simple resistance-to-time converter. It consists of two voltage comparators, a ramp voltage generator, two logic gates and impulse voltage calibrators. A square-wave generator circuit is suggested in this paper. The design is simple and independent of the OPAMP offset issues. The resulting square-wave is rectified to get its DC equivalent and to a triangular output; the two outputs are applied to a comparator for generating a digital output with a duty cycle proportional to a change in resistance upon which is dependent the DC.