Open AccessDLL‐based signal conditioning system for SAW sensor with digital output
Author(s) -
Rottava R.E.,
Rangel de Sousa F.,
Balashov S.M.
Publication year - 2016
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2016.0529
Subject(s) - signal conditioning , signal (programming language) , tracking (education) , acoustics , surface acoustic wave , sense (electronics) , electronic engineering , relative humidity , materials science , computer science , control theory (sociology) , engineering , physics , electrical engineering , power (physics) , psychology , pedagogy , control (management) , quantum mechanics , artificial intelligence , thermodynamics , programming language
The use of a delay‐locked loop (DLL) for conditioning signals from a surface acoustic wave (SAW) sensor is proposed. The system consists of a reference oscillator and a DLL. The signal generated in the reference oscillator is propagated through a sensitive SAW delay line (SAW‐DL). The SAW propagating through this structure has a phase velocity dependent on environmental parameters such as temperature, humidity, mechanical deformation, or analyte concentration. Therefore, the system measures the physical quantity of interest by tracking the delay caused by the sensitive SAW‐DL via a DLL. Fully digital DLL is made use of for the delay‐tracking, which provides the conversion of the environmental parameter being sensed directly to the digital domain. The system is demonstrated through results from behavioural simulation, using a model of an SAW‐DL sensitive to humidity.