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:
Apr. 29, 2003
Filed:
Apr. 05, 2001
Kouzou Ichimaru, Ohita Ken, JP;
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
In a frequency synthesizer that has a high spurious component elimination ratio, if the integer frequency division value is changed and a fractional frequency division value is to be generated, rounding circuit rounds the random number generated by random number generation circuit . Based on the integer value that is thereby generated, frequency division value control circuit generates an integer frequency division value. Because the integer frequency division value changes based on a random number, there is no regularity, and spurious components are never generated in output signal OUT. Even if compensation circuit generates a compensation current and superimposes it on the output of charge pump circuit , the influence of the ripple current output from charge pump circuit cannot be completely eliminated. However with frequency synthesizer of this invention, there is no regularity in the changes in the integer frequency division value, so even in this case, no spurious components arise in output signal OUT.