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:
Jun. 25, 2002
Filed:
Nov. 16, 1998
Ryoji Okita, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
Disclosed is a PLL control method of controlling a phase of a PLL for taking synchronism of a receiving signal in a data receiving apparatus. The phase of the PLL is synchronized with a phase when training irrespective of a line characteristic. The PLL control method comprises a step of training a timing phase of PLL in accordance with a training signal, a step of obtaining, immediately after training, a right-side reference value from a sum of tap coefficients of taps on the right side of a center tap of the auto equalization unit, and obtaining a left-side reference value from a sum of tap coefficients of taps on the left side of the center tap of said auto equalization unit, a step of calculating a sum of the tap coefficients of the taps on the right side of the center tap of the auto equalization unit, thereafter obtaining a first difference between the above sum and a right-side reference value, calculating a sum of the tap coefficients of the taps on the left side of the center tap of the auto equalization unit, and thereafter obtaining a second difference between the above sum and a left-side reference value, and a step of obtaining a PLL control signal by obtaining a difference between the first and second differences.