Highly accurate resistance deviation to frequency converter with programmable sensitivity and resolution

Abstract

A circuit based on a DC bridge is presented which allows for highly accurate and linear conversion of resistance deviation to frequency. The sensitivity and resolution of the circuit are programmable by component selection. A test of the converter demonstrates that sensitivities of 1 part in 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">5</sup> are obtained using standard electronic components. Use of higher quality components would provide even greater sensitivity.