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:
Jun. 07, 2005
Filed:
Jul. 24, 2002
Kazuyoshi Arimura, Kasugai, JP;
Tsuyoshi Moribe, Kasugai, JP;
Kazuyoshi Arimura, Kasugai, JP;
Tsuyoshi Moribe, Kasugai, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A phase shift circuit that generates a phase shift signal whose amplitude matches at a plurality of frequencies without increasing the circuit area. The phase shifter circuit includes first and second differential amplifiers which generate first and second first phase shift signals having a first amplitude at a first frequency. A third differential amplifier is connected in parallel to the first differential amplifier. The third differential amplifier generates a third phase shift signal having substantially the same amplitude as the first amplitude at a second frequency. The first differential amplifier is activated in accordance with the first frequency and the third differential amplifier is activated in accordance with the second frequency.