The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 23, 1999
Filed:
Sep. 25, 1997
Applicant:
Inventors:
Yoshio Satoh, Kawasaki, JP;
Osamu Ikata, Kawasaki, JP;
Takashi Matsuda, Kawasaki, JP;
Yoshitaka Takahashi, Yokohama, JP;
Ivan Dimitrov Avramov, Sofia, BG;
Assignees:
Fujitsu Limited, Kanagawa, JP;
Fujitsu Towa Electron Limited, Kanagawa, JP;
Primary Examiner:
Int. Cl.
CPC ...
H03B / ;
U.S. Cl.
CPC ...
3311 / ; 331135 ; 333193 ;
Abstract
An oscillation circuit of phase-shift type includes a surface acoustic wave filter in a feedback circuit, the surface acoustic wave filter having first and second one-port surface acoustic wave resonators of different resonance frequencies connected in a ladder configuration. The oscillation circuit has a high C/N ratio with a large bandwidth of variable frequency and can be fabricated in a small size with low costs.