Data decision apparatus and error measurement apparatus
US8005180B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 2007 |
| Grant date | Aug 23, 2011 |
| Priority date | — |
| Expiry date | Sep 8, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/03828
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The object of the present invention is to provide a data decision apparatus and an error measurement apparatus which can set the phase of the clock to the optimum state with respect to the data signal without continuously sweeping of the phase, and can keep the state for a long time. The data decision apparatus according to the present invention comprises a delay device (34) for delaying a data signal (Dc) outputted from a decision device (31) by one bit, a first phase detector (35) for detecting a phase difference between a data signal (Db) to be inputted to the decision device (31) and the data signal (Dc) outputted from the decision device (31), a second phase detector (36) for detecting a phase difference between the data signal (Dc) outputted from the decision device (31) and a data signal (Dd) outputted from the delay device (34), a third phase detector (37) for outputting a base voltage with respect to the output values of the first and second phase detectors (35 and 36), and a phase controller (38) for controlling a phase shift amount of a variable delay device (32) to equalize an output value (P1) of the first phase detector (35) to a center value between an output value (…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.