Clock recovery's impact on test and measurement

摘要

Clock recovery plays a significant role in making accurate test measurements, whether incorporated into the test setup or as part of the device under test. As most gigabit communication systems are synchronous, the data within them are timed against a common clock. Whether traveling across inches of circuit board or traversing continents on optical fiber, the relationship between the data and the clock they were timed against can become dis- turbed. By extracting clock directly from the data, signal regeneration at the receiver can be achieved correctly.