access icon free DLL-based signal conditioning system for SAW sensor with digital output

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.

Inspec keywords: oscillators; signal conditioning circuits; surface acoustic wave delay lines; delay lock loops; surface acoustic wave sensors

Other keywords: analyte concentration; DLL-based signal conditioning system; humidity; surface acoustic wave sensor; environmental parameters; sensitive SAW delay line; digital output; delay-locked loop; temperature; mechanical deformation; SAW sensor; reference oscillator; phase velocity

Subjects: Sonic and ultrasonic transducers and sensors; Acoustical measurements and instrumentation; Oscillators; Other digital circuits; Acoustic wave devices

http://iet.metastore.ingenta.com/content/journals/10.1049/el.2016.0529
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content/journals/10.1049/el.2016.0529
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