Open AccessSelf‐calibrating closed‐loop circuit for configurable constant voltage thermal anemometers
Author(s) -
Gorreta S.,
Barajas E.,
Kowalski L.,
Atienza M.T.,
DominguezPumar M.,
Jimenez V.
Publication year - 2015
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2015.1947
Subject(s) - anemometer , input offset voltage , voltage , electrical engineering , amplifier , offset (computer science) , constant current , power (physics) , operational amplifier , electronic engineering , engineering , computer science , physics , cmos , mechanics , turbulence , programming language , quantum mechanics
A new circuit is described which applies a configurable voltage across an RTD while the current flowing through it is measured with a current mirror. The circuit also allows working with voltages above the IC supply voltage to cope with the high power RTD dissipation normally required in thermal anemometers. The circuit is periodically calibrated to cancel the errors and amplifier offset and therefore improves measurement accuracy. Experimental measurements of the circuit fabricated using 0.35 μm AMS technology show the functionality and improved power efficiency.