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Title:
SURFACE ACOUSTIC WAVE FILTER AND VOLTAGE CONTROLLED OSCILLATOR HAVING THE SAID FILTER
Document Type and Number:
Japanese Patent JP3112996
Kind Code:
B2
Abstract:

PURPOSE: To obtain the frequency variable surface acoustic wave filter with respect to the surface acoustic wave filter and the voltage controlled oscillator provided with the surface acoustic wave filter.
CONSTITUTION: A DC bias is given between common electrodes 18, 20, 22, 24 connecting to an input transducer 14 and an output transducer 16 and rear side DC bias electrode 26 to vary a piezoelectric constant of a chip 10 made of a piezoelectric crystal thereby obtaining a required frequency characteristic.


Inventors:
Masakazu Kishi
Yoshifumi Nakajima
Ichiro Maruyama
Kageharu Yoshizawa
Application Number:
JP22986691A
Publication Date:
November 27, 2000
Filing Date:
September 10, 1991
Export Citation:
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Assignee:
富士通株式会社
International Classes:
H03B5/24; H03B5/32; H03H9/25; H03H9/64; (IPC1-7): H03H9/25; H03B5/24; H03B5/32; H03H9/64
Domestic Patent References:
JP3201611A
JP4731557A
Other References:
【文献】米国特許4636678(US,A)
Attorney, Agent or Firm:
Akira Matsumoto



 
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