Methods for an analog rotational sensor having signal inversion

摘要

A method of providing a magnetic sensor with a signal inversion module coupled to a signal generation module for inverting a first waveform and a second waveform, wherein the signal inversion module outputs the first and second waveforms in a first region spanning a first range of angular position of the magnet and outputs the first and second inverted waveforms in a second region spanning a second range of angular position of the magnet.

主权项

1. A method of providing a magnetic sensor, comprising:
providing a signal generation module including a first magnetic sensor to generate a first waveform in the form of a sine wave and a second magnetic sensor to generate a second waveform in the form of a cosine wave, the first and second waveforms containing angular position information of a magnet in relation to the first and second magnetic sensors; providing an analog signal processing module for providing an algebraic manipulation of the first waveform and the second waveform to generate a linear position output voltage signal; and providing a signal inversion module coupled to the signal generation module for inverting the first waveform to provide a first inverted waveform and for inverting the second waveform to provide a second inverted waveform, wherein the signal inversion module outputs the first and second waveforms in a first region spanning a first range of angular position of the magnet and outputs the first and second inverted waveforms in a second region spanning a second range of angular position of the magnet, wherein an output of the sensor is defined byoutput=A⁢⁢sin⁡(θ)A⁢⁢cos⁡(θ)±Ab,wherein A is an amplitude of the first and second waveforms, b is a constant and θ indicates an angle of a rotating magnet in the magnetic sensor.