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. 15, 2002
Filed:
Aug. 28, 2001
Fujitsu Limited, Kawasaki, JP;
Abstract
It is intended to provide a compact circuit configuration used for a frequency multiplier device, suitable to selectively output among a plurality of multiplied frequencies, with less power consumption. The frequency multiplier device uses an input frequency signal f and an output multiplied signal nf to form original signals a and c, as well as phase shifted signals b and d that are phase shifted to ±&pgr;/2 from the original signals a and c, the signals are mixed in a mixer circuits and and summed in a summing amplifier to generate an output frequency signal fOUT. The phase inverter circuit (differential amplifier circuit) and selector circuit (SEL ) ) controls the phase inversion of one of signals to selectively output one of mixed frequencies (n±1)f as the output frequency signal fOUT. A selector circuit (SEL ) turns off a on-off switch circuit to block the input frequency signal f while at the same time operate the mixer circuits and as the differential amplifier to output the output multiplied signal nf as the output frequency signal fOUT.