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. 10, 2000
Filed:
Dec. 16, 1998
Kouzou Ichimaru, Kunisaki-machi, JP;
Yohichi Kawahara, Beppu, JP;
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
The purpose of the present invention is to provide a frequency synthesizer which does not have spurious components. Automatic reference correcting circuit 4 is provided to frequency synthesizer 1 which changes the frequency division value of the divider and makes the frequency of external output signal (OUT) into a value equal to the frequency of the reference clock signal multiplied by the average frequency division value, charge pump circuit 35 measures the ripple component contained in the output control signal, and ripple correcting circuit 39 forms compensation current, which is superimposed on the control signal in order to minimize the ripple component. If composed for control circuit 55 to obtain the optimum compensation current and output to ripple correcting circuit 39 while negative feedback which minimizes the ripple component is being formed, output signal (OUT) which does not have spurious components can be obtained.