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. 16, 1990
Filed:
Dec. 22, 1989
Applicant:
Inventor:
Nobuo Hareyama, Kanagawa, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03L / ;
U.S. Cl.
CPC ...
331-2 ; 331 16 ; 331 25 ; 455260 ;
Abstract
A frequency synthesizer having first and second PLLs coupled by a mixer to provide an output signal which changes in predetermined frequency steps or increments is capable of operation in a first frequency change mode in which frequencies of output signals from the first and second PLLS change in the same direction or in a second frequency change mode in which the frequencies of the output signals from the first and second PLLs change in opposite directions, and the first or second frequency change mode is selected on the basis of a dividing ratio employed in one of the first and second PLLs.