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:
Nov. 04, 2003
Filed:
Nov. 09, 1999
Applicant:
Inventor:
Yasuhiko Matuyama, Nagasaki, JP;
Assignee:
Sony Corporation, , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03D 1/300 ; G01R 1/900 ;
U.S. Cl.
CPC ...
H03D 1/300 ; G01R 1/900 ;
Abstract
A detection circuit for a maximum amplitude value of a 3-phase signal wherein the three phase-signals having a phase difference of 120° from each other is converted to sampling data of digital values by an A/D converter circuit in every sampling period properly decided, and after that, when the coincidence of the values of any two phase-signals among three phase-signals is detected, the value of the remaining one phase-signal is taken as the maximum amplitude value. Thereby, an accurate maximum amplitude value can be obtained.