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:
Oct. 22, 2002
Filed:
Nov. 19, 1999
Yoshikazu Kakura, Tokyo, JP;
Tomoki Osawa, Tokyo, JP;
NEC Corporation, , JP;
Abstract
A sign determination circuit is input with in-phase signal I, and outputs in-phase sign determination signal S to indicate the sign, positive or negative, of in-phase signal I. Another sign determination circuit is input with orthogonal signal Q, and outputs orthogonal sign determination signal S to indicate the sign, positive or negative, of orthogonal signal Q. A decoder is input with in-phase sign determination signal S and orthogonal sign determination signal S , judging which quadrant the vector represented by in-phase signal I and orthogonal signal Q belongs to, thereby determining I&thgr; , I&thgr; to indicate the 180° bit and 90°-bit, respectively, of angle information I&thgr;. Also, I&thgr; , I&thgr; to indicate the 45°-bit and 22.5°-bit, respectively, of angle information I&thgr; is given by the other decoders.