Abstract
A technique of differential rectification is proposed for three-phase coil based inductive angle sensors so that the amplitude difference between any two of the amplitudes of three-phase coils is output for further signal processing. A 3-to-6 multiplexer, a low pass filter, and a 6-to-2 multiplexer are designed for the proposed technique, which is used for differential rectification, turning rectified signals into DC levels, and transmitting DC levels to the output of differential rectifiers, respectively. This differential rectification could suppress 3rd harmonic noise and common-mode noise, in order to improve the accuracy of angle calculation. The circuit of the proposed differential rectifier is given and simulation results shown in this manuscript verify the proposed circuit is feasible for three-phase coil based inductive angle sensors.
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