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. 22, 2003
Filed:
Aug. 29, 2001
Hyungki Huh, Kyung-Ki-Do, KR;
Eunseok Song, Seoul, KR;
Kang Yoon Lee, Seoul, KR;
Yido Koo, Seoul, KR;
Jeongwoo Lee, Seoul, KR;
Joonbae Park, Seoul, KR;
Kyeongho Lee, Seoul, KR;
GCT Semiconductor, Inc., San Jose, CA (US);
Abstract
A phase-locked loop (PLL) frequency synthesizer incorporates fractional spur compensation circuitry. This fractional spur compensation circuitry dynamically compensates charge pump ripple whenever a charge pump operates. It can utilize a programmable divider, two phase detectors each using a charge pump stage pumps. A fractional accumulator stage determines the number of charge pumps that operate during a phase comparison. The PLL frequency synthesizer avoids the need for compensation current trimming. Also, fractional compensation is accomplished dynamically and in a manner that is robust to environmental changes.