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:
Nov. 26, 1996
Filed:
Jun. 07, 1995
Shinsaku Mori, Kouhoku-ku, Yokohama-shi, Kanagawa 223, JP;
Duk-Kyu Park, , US;
Hiroshi Miyagi, Yokohama, JP;
Other;
Shintom Co., Ltd., Kanagawa, JP;
Abstract
A frequency synthesizer includes a phase detector for comparing a reference frequency with a feedback frequency, a filter connected to the phase detector for permitting the passage of low frequency therethrough, a voltage controlled oscillator connected to the filter, a multistage frequency converter for receiving the oscillator signal from the voltage controlled oscillator as an input, and a divider for dividing the output of the multistage frequency converter to form the feedback frequency. The multistage frequency converter includes a plurality of frequency converters connected in series or parallel to each other, each of the frequency converters being adapted to perform a non-integer division. The division ratio can be set arbitrarily and finely. Thus, the feedback frequency inputted to the phase detector can be maintained constant and yet higher, irrespectively of the output frequency of the frequency synthesizer. Therefore, the reference frequency can be also maintained higher as is the feedback frequency, irrespectively of the frequency interval in the output frequency of the voltage controlled oscillator. This enables the acquisition time to be greatly reduced.