Abstract
A novel 8-bit CMOS A/D converter with piecewise linear characteristic is designed, implemented and tested. It can be regarded as a two-stage flash A/D converter. The resulting architecture can be applied to the linearization of nonlinear characteristics of a wide variety of sensors, just adapting the break points of the piecewise linear characteristic to get the best-fit approach to the inverse of the sensor characteristic under consideration. A very compact implementation is obtained, since two-stage A/D conversion and linearization are both performed simultaneously by the same circuit and because both A/D conversion stages share most of the required hardware. As a particular example, a sinusoidal nonlinearity, typical of several types of solid-state sensors, is compensated in this paper. Measurement results for a 2 μm CMOS prototype demonstrate the validity of the proposed approach.
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