Title :
Smart sensor interface with A/D conversion and programmable calibration
Author :
Malcovati, P. ; Leme, Azeredo C. ; O´Leary, P. ; Maloberti, F. ; Baltes, H.
Author_Institution :
Phys. Electron. Lab., Eidgenossische Tech. Hochschule, Zurich, Switzerland
fDate :
8/1/1994 12:00:00 AM
Abstract :
In this paper we present a new architecture for a smart sensor interface. It is based on an oversampled A/D converter associated with a small ROM containing calibration coefficients. The nonlinear function desired is obtained by piecewise linear interpolation between the values stored in the ROM, without any additional circuits. This solution has the advantage of high programming flexibility, long-term stability, and low area consumption. Moreover, it is suitable for co-integration with sensors because of its minimum analog content. A prototype was integrated in a CMOS 1.2-μm technology. Simulation and experimental results are reported together with a detailed theoretical analysis and some design guidelines
Keywords :
CMOS integrated circuits; analogue-digital conversion; calibration; intelligent sensors; linear integrated circuits; 1.2 micron; A/D conversion; CMOS; area consumption; calibration coefficients; design guidelines; long-term stability; oversampled A/D converter; piecewise linear interpolation; programmable calibration; programming flexibility; smart sensor interface; Analytical models; CMOS technology; Calibration; Circuit stability; Integrated circuit technology; Intelligent sensors; Interpolation; Piecewise linear techniques; Prototypes; Read only memory;
Journal_Title :
Solid-State Circuits, IEEE Journal of
