Title :
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
fDate :
8/1/1999 12:00:00 AM
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;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
