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. 02, 1997
Filed:
Feb. 13, 1996
Applicant:
Inventors:
Assignee:
Matsushita Electric Industrial Co, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03L / ;
U.S. Cl.
CPC ...
331 16 ; 331 25 ; 327105 ; 327113 ; 327147 ; 327156 ;
Abstract
This is a PLL frequency synthesizer having a reference divider for dividing a reference source signal, and an RF divider for dividing the output of a voltage controlled oscillator, wherein when changing over the frequency, first the division value of the RF divider changes periodically to become a fractional division value in average, and after the frequency is nearly changed over, the RF divider is set in a conventional integer division operation, therefore, the frequency can be changed over at high speed by the fractional division operation high in reference frequency, and after the changing, a low spurious signal characteristic may be realized.