| 摘要 |
PURPOSE: To apply extremely fine resolution for restoring data from a received signal by providing a multi-phase clock generator, phase commentator, and clock deglitcher. CONSTITUTION: An N stage ring oscillator 12 in a multi-phase clock generator 10 generates an N clock signals 13 having a phase relation with equal intervals, and supplies them to an N-ary multiplexer 20 in a phase commutator 18. Also, each frequency of the signals 13 is locked to the frequency of a basic crystal clock 14 by an analog phase lock loop 16 as a feedback signal from the oscillator 12. Next, a clock deglitcher 24 removes spike in a multiplexer signal 23 (phase clock signal) selected by the multiplexer 20 through delay stages 26 and 28 and an NAND gate 30. Thus, at the time of restoring data from a sample clock received signal, extremely fine resolution can be applied to a clock step operation. |
