Title :
PWM-A/D conversion: a flexible and low-cost solution for transducer linearization
Author :
Pereira, J. M Dias ; Postolache, O. ; Girao, P. Silva
Author_Institution :
Instituto de Telecomunicagoes, ESTSetubal, Setubal, Portugal
Abstract :
This paper proposes a linearization technique based on a pulse width modulated (PWM) analog-to-digital (A/D) converter. The hardware and software associated with the converter are specially tailored to linearize transducer characteristics by varying the duty cycle of the PWM signal in each of the input range sub-intervals (IRS) that are considered for a given application. The proposed solution can also provide an automatic variable range selection and continuous auto-calibration capabilities that can be used to correct offset and gain errors. Simulation and experimental results are used to confirm the theoretical expectations of the proposed solution for nonlinear transducer interfacing
Keywords :
analogue-digital conversion; calibration; circuit simulation; circuit testing; error correction; linearisation techniques; pulse width modulation; transducers; PWM signal duty cycle; PWM-A/D conversion; automatic variable range selection; continuous auto-calibration; converter hardware; converter software; gain errors; input range sub-intervals; linearization technique; nonlinear transducer interfacing; offset errors; pulse width modulated analog-to-digital converter; simulation; transducer linearization; Calibration; Circuits; Error correction; Hardware; Linearization techniques; Microcontrollers; Pulse width modulation; Pulse width modulation converters; Telecommunications; Transducers;
Conference_Titel :
Sensors for Industry, 2001. Proceedings of the First ISA/IEEE Conference
Conference_Location :
Rosemont, IL
Print_ISBN :
0-7803-6659-X
DOI :
10.1109/SFICON.2001.968540
