| US 7,394,180 B2 | ||
| Oscillator circuit including surface acoustic wave sensor and biosensor apparatus | ||
| Kenjiro Okaguchi, Kyoto-fu (Japan); Koji Fujimoto, Otsu (Japan); and Michio Kadota, Kyoto (Japan) | ||
| Assigned to Murata Manufacturing Co., Ltd., Kyoto (Japan) | ||
| Appl. No. 10/595,317 PCT Filed Sep. 08, 2004, PCT No. PCT/JP2004/013072 § 371(c)(1), (2), (4) Date Apr. 07, 2006, PCT Pub. No. WO2005/043150, PCT Pub. Date May 12, 2005. |
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| Claims priority of application No. 2003-372207 (JP), filed on Oct. 31, 2003. | ||
| Prior Publication US 2007/0252475 A1, Nov. 01, 2007 | ||
| Int. Cl. H01L 41/09 (2006.01) | ||
| U.S. Cl. 310—317 [310/313 R; 331/155] | 7 Claims |
| 1. A surface-acoustic-wave-sensor-included oscillator circuit comprising:
a piezoelectric substrate;
an electrode arranged on the piezoelectric substrate so as to excite a surface acoustic wave;
a reaction film arranged on the piezoelectric substrate so as to cover the electrode and so as to excite a surface acoustic
wave, the reaction film being bound to a target substance or a binding material to be bound to the target substance; and
a surface acoustic wave sensor that is capable of detecting a bit of mass loading on the basis of a variation in frequency
being connected as a resonator; wherein
the surface-acoustic-wave-sensor-included oscillator circuit includes a direct-current cutting capacitor connected in series
to the surface acoustic wave sensor, and an impedance matching circuit including the direct-current cutting capacitor is provided
in the surface-acoustic-wave-sensor-included oscillator circuit.
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