Patent ID: 7078938
Filing Date: 2006-07-18
Classification: H03D

Abstract:
1. A method of detecting a phase difference, the method comprising: generating first and fourth phase difference signals having a first phase difference and a fourth phase difference, respectively, and first and second phase difference information signals having a second phase difference and a third phase difference, respectively, from an input signal and a plurality of clock signals, each of which has a different phase; lowering a level of the first phase difference information signal to generate a second phase difference signal having a first level less than levels of the first and fourth phase difference signals; lowering a level of the second phase difference information signal to generate a third phase difference signal having a second level less than the levels of the first and fourth phase difference signals; and generating a synchronization signal with which the first phase difference signal, the fourth phase difference signal, the first phase difference information signal, and the second phase difference information signal are synchronized.