Oscillator circuit including surface acoustic wave sensor...

Details Oscillator circuit including surface acoustic wave sensor... Oscillator circuit including surface acoustic wave sensor...

2008-07-01

2008-07-01

Dougherty, Thomas M (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S31300R, C331S155000

Reexamination Certificate

active

07394180

ABSTRACT:
A surface-acoustic-wave-sensor-included oscillator circuit does not cause separation of an electrode film due to application of a bias voltage and can reliably accurate operate even if liquid is adhered thereto. The surface-acoustic-wave-sensor-included oscillator circuit includes interdigital electrode disposed on a piezoelectric substrate and a reaction film that is arranged so as to cover the interdigital electrodes and bound to a target substance or a binding material to be bound to the target substance. A surface acoustic wave sensor that is capable of detecting a bit of mass loading on the basis of a variation in frequency is connected as a resonator in the surface-acoustic-wave-sensor-included oscillator circuit. Direct-current cutting capacitors are connected in series to the surface acoustic wave sensor, and the direct-current cutting capacitors respectively define impedance matching circuits in the surface-acoustic-wave-sensor-included oscillator circuit.

REFERENCES:
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patent: 2004/0233008 (2004-11-01), Kobayashi
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Official communication issued in the counterpart Chinese Application No. 200480032329.0, mailed on May 25, 2007.
International Search Report for PCT Application No. PCT/JP2004/013072, mailed Dec. 28, 2004.
Official communication issued in counterpart Chinese Application No. 200480032329.0, issued on Mar. 14, 2008.

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