A linear resistance-to-frequency converter

摘要

A resistance-to-frequency converter consisting of a Wheatstonebridge followed by an integrator and a comparator is described. It isbasically a relaxation oscillator whose frequency changes linearly witha resistance change detected by the bridge. Analyses show that aresolution higher than 0.05% is possible with the simple configurationand an excellent linearity is kept over the wide resistance change by asimple compensation method. The converter is therefore best suited foran interface of a resistive sensor. Experimental results are also givento demonstrate its performance