Patent ID: 6411650
Filing Date: 2002-06-25
Classification: H03L,H04L

Abstract:
A PLL control method in a data receiving apparatus including an auto equalization unit for automatically equalizing a demodulated receiving signal, said method comprising:a step of training in a timing phase of a PLL in accordance with a training signal; a step of obtaining, after training, a right-side reference value from a sum of tap coefficients of taps on the right side of a center tap of said 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, after obtaining the two reference values, a first sum of the tap coefficients of the taps on the right side of the center tap of said auto equalization unit, thereafter calculating a first difference between the first sum and the right-side reference value, calculating a second sum of the tap coefficients of the taps on the left side of the center tap of said auto equalization unit, and thereafter obtaining a second difference between the second sum and the left-side reference value; and a step of obtaining a PLL control signal by obtaining a difference between the first and second differences.