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:
Jul. 15, 2003
Filed:
May. 05, 2000
Masaaki Soda, Tokyo, JP;
NEC Electronics Corporation, Kanagawa, JP;
Abstract
To provide a high speed digital PLL circuit which is easily manufactured by IC process. The phase of data signal is locked with a first clock of which frequency is the half of the data signal. Further, a second clock of which phase is shifted by &pgr;/2 compared with the first clock is used for determining phase delay or phase advance of the data signal compared with the first clock. VCO outputs the first clock and the second clock. The phase comparator for inputting the data signal, the first and second clock, outputs a first data sampled at rise up of the first clock, a second data sampled at fall down of the first clock, a first indication signal indicating the phase delay, and a second indication signal indicating the phase advance. The filter for inputting the first and second indication signal outputs a control voltage for VCO.