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:
Dec. 26, 2000
Filed:
Jun. 17, 1999
Applicant:
Inventor:
Jiro Kikuchi, Fukushima-ken, JP;
Assignee:
Alps Electric Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04L / ;
U.S. Cl.
CPC ...
375308 ; 375302 ; 375376 ;
Abstract
A transmitting circuit comprises a QPSK modulator, a voltage controlled oscillator used as a frequency modulator, and a PLL circuit for controlling the oscillation frequency of the voltage controlled oscillator. The frequency of a reference signal supplied to the PLL circuit is used as a first reference frequency in the event of performing the QPSK modulation by the QPSK modulator and is used as a second reference frequency lower than the first reference frequency in the event of performing the frequency modulation by the voltage controlled oscillator.