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:
Aug. 22, 2017
Filed:
Feb. 10, 2016
Applicant:
Yokogawa Electric Corporation, Tokyo, JP;
Inventor:
Akihiro Oshima, Musashino, JP;
Assignee:
Yokogawa Electric Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03B 5/32 (2006.01); H03L 7/099 (2006.01); H03L 5/00 (2006.01); G01C 19/56 (2012.01); G01C 19/5776 (2012.01);
U.S. Cl.
CPC ...
H03L 7/099 (2013.01); G01C 19/56 (2013.01); G01C 19/5776 (2013.01); H03B 5/32 (2013.01); H03L 5/00 (2013.01);
Abstract
A self-oscillation circuit includes a vibration unit having a vibrator, a positive feedback path which positively feeds back a signal based on vibration of the vibrator to the vibration unit, a negative feedback circuit which generates a pulse-width-modulated signal having a frequency lower than a vibration frequency of the vibrator, based on a comparison result between a value corresponding to an amplitude of the vibrator and a reference value, and a switch circuit which switches connection and disconnection of the positive feedback path to the vibration unit by the pulse-width-modulated signal.