SMART SENSOR INTERFACE WITH A D CONVERSION AND PROGRAMMABLE CALIBRATION/

In this paper we present a new architecture for a smart sensor interfa ce. It is based on an oversampled A/D converter associated with a smal l ROM containing calibration coefficients. The nonlinear function desi red is obtained by piecewise linear interpolation between the values s tored in the ROM, without any additional circuits. This solution has t he advantage of high programming flexibility, long-term stability, and low area consumption. Moreover, it is suitable for co-integration wit h sensors because of its minimum analog content. A prototype was integ rated in a CMOS 1.2-mum technology. Simulation and experimental result s are reported together with a detailed theoretical analysis and some design guidelines.