Publication Type:

Journal Article


Instrumentation and Measurement, IEEE Transactions on, Volume 58, Number 5, p.1617-1622 (2009)


analogue-digital conversion, Differential resistive sensor, differential resistive sensors, Direct digital converter, direct resistance-to-digital converter, electric sensing devices, resistance-to-digital converter (RDC), Sigma-Delta ADC, sigma-delta analog-to-digital conversion, sigma-delta resistance-to-digital converter, sigma–delta ( $Sigma$–$Delta$ ) converter, signal conditioning


A direct resistance-to-digital converter (RDC) that is suitable for differential resistive sensors is proposed and analyzed in this paper. The RDC presented here provides a digital output that is linearly proportional to the parameter being sensed by a differential resistive sensor possessing either linear or inverse characteristics. The RDC employs the sigma-delta analog-to-digital conversion (Sigma-Delta ADC) principle and, hence, possesses all the advantages and limitations of such an ADC. Analysis shows that the proposed RDC has negligible sensitivity to variations in circuit parameters. Experimental results on a prototype built and tested gave a worst-case error < 0.15%, establishing the efficacy of the proffered RDC.

Cite this Research Publication

N. M. Mohan, George, B., and Kumar, V. J., “Analysis of a Sigma - Delta Resistance-to-Digital Converter for Differential Resistive Sensors”, Instrumentation and Measurement, IEEE Transactions on, vol. 58, pp. 1617-1622, 2009.