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

fYear

2001

fDate

2001

Firstpage

258

Lastpage

263

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Sensors for Industry, 2001. Proceedings of the First ISA/IEEE Conference

Conference_Location

Rosemont, IL

Print_ISBN

0-7803-6659-X

Type

conf

DOI

10.1109/SFICON.2001.968540

Filename

968540