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:
Jan. 17, 2017
Filed:
Jan. 21, 2016
Fujitsu Limited, Kawasaki-shi, Kanagawa, JP;
Hiroshi Matsumura, Isehara, JP;
FUJITSU LIMITED, Kawasaki, JP;
Abstract
A receiver circuit includes: a local signal generation circuit that generates a local signal; and a test signal generation circuit that generates a test signal having a frequency close to a frequency of the local signal, wherein the test signal generation circuit includes an oscillator that generates the test signal, a mixer that mixes the local signal with an output of the oscillator to generate a low-frequency signal which is a difference signal between the local signal and the output of the oscillator, a phase detector that detects a phase difference between the low-frequency signal output by the mixer and a reference signal, and a filter that extracts a low-frequency component from an output of the phase detector, and controls an oscillation frequency of the oscillator by using an output of the filter.