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:
Mar. 19, 2002
Filed:
Jun. 28, 2000
Akira Kuwano, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
An orthogonal modulator capable of eliminating an offset component between an I signal and a Q signal. The orthogonal modulator includes a generation circuit for generating a plurality of base band signals such as voice signal, a mixing circuit for mixing the base band signals and a plurality of carrier waves, an extraction circuit for extracting each DC offset component generated by the generation circuit or the mixing circuit, a comparison circuit for comparing the DC offset components thus extracted with each other, an addition circuit for adding a plurality of comparison results with other comparison results, and an offset elimination circuit for eliminating the DC offset components included in a plurality of addition signals by subtracting the DC offset components from the base band signals before they are applied to the mixing circuit.