Superior-order curvature-correction CMOS smart temperature sensor

Abstract

The circuit presented in this paper responds to both of the main requirements of a smart temperature sensor: high performance (that is a very good linearity with respect to temperature variations) and a small price per chip (realized by reducing the die area and the interconnection costs). The core of the proposed smart temperature sensor is represented by an exponential curvature-corrected CMOS bandgap reference, with a temperature coefficient of 7.5 ppm/K for an extended temperature range. The entire circuit was implemented in 0.35 /spl mu/m CMOS technology, the analog core occupying a die area of about 70 /spl mu/m /spl times/ 110 /spl mu/m. In order to reduce the interconnection costs and their delays and static errors, an I/sup 2/C interface was on-chip integrated.