BertScope boosts speed, decomposes jitter
-- Test & Measurement World, 3/1/2009 2:00:00 AM
Synthesys Research has boosted the speed of its flagship BertScope BER (bit error rate) tester from 12.5 Gbps to 17.5 Gbps. With their higher speed, the 17500A and Si 17500C instruments can perform BER tests and display eye diagrams on 14-Gbps Fibre Channel devices and systems. They can also analyze serial data streams from 500 Mbps to 17.5 Gbps. The 17500C adds a jitter source for receiver testing.
The company has also added a software option called Jitter Map to the BertScope line. Jitter Map uses the BertScope’s BER tester to decompose jitter into random and deterministic jitter, then further decomposes deterministic jitter into data-dependent jitter, bounded uncorrelated jitter (such as sinusoidal), intersymbol interference, and other components, displaying them as a map of total jitter.
Jitter Map analyzes signals for bounded uncorrelated jitter by looking at the same bit in a PRBS pattern. Such analysis lets you find which bits contribute to bit errors. The software also contains a divider that lets you look at a clock rate divided by two, four, five, and so forth and display an eye diagram for each one. This lets you find which clock signals in a circuit contribute to periodic jitter.
To reduce the time needed for making jitter and BER measurements on long bit patterns such as PRBS31, Jitter Map uses data obtained from short patterns such as PRBS7. It then measures total jitter on the longer pattern and calculates the jitter components based on the shorter patterns.
Base prices: BertScope 17500A—$185,000; BertScope Si 17500C—$235,000; Jitter Map—$15,000. Synthesys Research, www.bertscope.com.
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