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Simple Interface for Resistive Sensors Based on Pulse Width Modulation
DOI:10.1109/TIM.2013.2266025.png)
Abstract
En 中文
A resistance to pulse width converter with improved stability and temperature compensation is described. The converter is therefore suited as a signal conditioner for resistive sensors. The sensor interface is based on a multivibrator in monostable or astable configuration and combines the single point calibration used in direct sensor-to-microcontroller interface. Analyses show that a resolution better than 14.2 b (for 20 MHz time base) with maximal relative error of 0.11% in the range 1000-3000 Omega is achievable. In this paper, a comparative analysis in terms of measuring uncertainty, speed, and resolution between the multivibrator in monostable and astable operation is performed. A method for defining optimal time constant that results in best speed/resolution trade-off is proposed.
Keywords:
Multivibrator
pulse width modulation
resistive sensor
sensor interface
sensor systems
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