Eye violation and excess jitter trigger
US7983332B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 2007 |
| Grant date | Jul 19, 2011 |
| Priority date | — |
| Expiry date | Nov 7, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/24
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An eye violation and excess jitter trigger for a digital signal uses a mask within a unit interval of the digital signal, such as a rectangular mask having corners defined by a high threshold, a low threshold, an early clock and a late clock, the early and late clocks being derived from a reference clock. The reference clock may be a recovered clock derived from the digital signal or from high and low threshold comparator outputs, or may be an external clock. For the excess jitter trigger, which is a special case of the eye violation trigger, the high and low thresholds are essentially equal. A status of the digital signal with respect to the mask is determined using the high and low thresholds and the early and late clocks, and a violation signal is output when the status indicates that a portion of the digital signal crossed into the mask. The violation signal may then be used to trigger data acquisition or for other purposes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.