Frequency warping for improving resonator signal-to-noise ratio

Details Frequency warping for improving resonator signal-to-noise ratio Frequency warping for improving resonator signal-to-noise ratio

G - Physics

01

N

G01N 29/02 (2006.01) G01N 29/34 (2006.01) G01N 29/36 (2006.01) G01N 29/42 (2006.01)

Patent

CA 2378759

A sensor circuit for use in measuring concentrations of an analyte in a fluid is comprised of a BAW sensor, a voltage variable capacitor connected to the sensor, an input which supplies a bias warping do voltage to the voltage variable capacitor, and a resonant oscillator circuit. The resonant oscillator circuit detects the fundamental frequency of the sensor and produces a resonant signal frequency. The bias warping do voltage applied to the voltage variable capacitor warps the resonant frequency of the circuit away from inharmonic noise.

La présente invention concerne un circuit de capteurs qui est utilisé dans la mesure des concentrations d'un analyte dans un fluide. Ce circuit de capteurs est composé d'un capteur d'ondes acoustiques en volume (BAW), d'une diode à capacité variable connectée au capteur, d'une entrée qui alimente en tension en courant continu à distorsion de polarisation ladite diode à capacité variable, ainsi qu'un circuit d'oscillateur de résonance. Ce circuit d'oscillateur de résonance détecte la fréquence fondamentale du capteur et produit une fréquence de signal de résonance. La tension en courant continu à distorsion de polarisation, appliquée à la diode à capacité variable, induit la distorsion de la fréquence de résonance du circuit, afin de l'éloigner du bruit inharmonique.

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