High-frequency one-port colpitts SAW oscillator for chemical sensing

S Thomas, Z Rácz, Marina Cole, Julian W Gardner

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review


Abstract—This paper reports upon the design and development of a low cost, high sensitivity, high frequency surface acoustic wave resonator (SAWR) based system for gas sensing applications. The 262 MHz one-port SAWR operates in a grounded-base Colpitts oscillator arrangement that was developed based on an equivalent circuit model. Electrical characteristics of the fabricated SAWR show good agreement with its equivalent device model at the resonant frequencies, and it was found to have good stability and sensitivity with a Q-factor in air of about 2,870 at its fundamental resonant frequency. The sensor system is designed to operate in a dual configuration in which one resonator is coated with a gas- sensitive polymer (polyethylene) coating, whilst the second one is used as a reference channel; thereby eliminating common mode interferences on the baseline signal. Mass sensitivity was found to be ca. 1 Hz/ng, which corresponds to sub-ppm sensitivity to gas/odour concentration.
Original languageEnglish
Title of host publicationCENICS 2013: International Conference on Advances in Circuits, Electronics and Micro-electronics
EditorsVladimir Privman
Number of pages5
ISBN (Print)9781612083025
Publication statusPublished - 2013

Publication series

NameCENICS 2013: International Conference on Advances in Circuits, Electronics and Micro-electronics

Bibliographical note

Paper is available in the archive of the free access ThinkMindTM Digital Library


  • -acoustic waves
  • an investigation into different
  • bvd
  • chemical
  • colpitts oscillator
  • cut quartz wafer
  • equivalent circuit
  • for application in low-cost
  • model
  • one-port
  • polymer coating
  • saw resonator
  • sensors


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