A low-cost circuit with direct digital output for pressure measurement

Author

Morlán, Carmen Busoch ; Buafull, Brian Opady ; Miranda, Germán Morales ; Regueiro-Gómez, Angel

Author_Institution

ISPJAE Univ., Havana, Cuba

Volume

48

Issue

4

fYear

1999

fDate

8/1/1999 12:00:00 AM

Firstpage

817

Lastpage

819

Abstract

A low-cost circuit with direct digital output for pressure measurement is presented. This circuit, with pulse width modulators and digital frequency differentiation, allows highly accurate and linear conversion of resistance deviation over time. Analytical expressions for system performance are obtained and verified experimentally. This alternative not only allows a cancellation of temperature drifts but also the output shows good robustness and repeatability of pressure measurement

Keywords

analogue-digital conversion; biomedical electronics; blood pressure measurement; bridge circuits; differentiating circuits; modulators; pulse width modulation; signal processing equipment; accurate linear conversion; arterial blood pressure measurement; digital frequency differentiation; direct digital output; linearity; low-cost circuit; measurement robustness; pulse width modulators; repeatability; resistance deviation over time; resistance-to-time convertor; signal conditioning; system performance; temperature drift cancellation; Chirp modulation; Digital modulation; Frequency conversion; Frequency modulation; Performance analysis; Pressure measurement; Pulse circuits; Pulse width modulation; Space vector pulse width modulation; System performance;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.779180

Filename

779180