Characterize the highest speed signals
Martin Rowe - September 17, 2012With serial data rates pushing ever higher, test equipment must keep up. The BERTScope BSA286C from Tektronix lets you test and analyze components and equipment at speeds up to 28.6 Gbps. That’s fast enough for work in 100 Gbps Ethernet, 16 Gbps Fibre Channel, USB 3.0, and other serial data streams.
The BERTScope BSA286C can generate test patterns at lengths up to PRBS31 (1031-1), which is becoming the norm for testing the highest speed serial links. You can add impairments such as sinusoidal jitter to the test pattern for receiver stressed-eye testing. For testing transmitters, the BERTScope can, because it’s a BER (bit-error rate) tester, measure BER directly or it can extrapolate BER based on jitter measurements out to 10-10 BER. For measuring smaller BER levels down to 10-12, you can operate the instrument like a traditional BERT and count errors over time.
Because jitter consists of many components, the instrument decomposes jitter into such as BUJ (bounded uncorrolated jitter), DDJ (data-dependent jitter), DCD (duty-cycle distortion), and ISI (intersymbol interference). The screen uses flowcharts called jitter maps to graphically show how jitter is decomposed. The instrument also decomposes jitter into EJ (emphasis Jitter, UJ (uncorrelated jitter, DDPWS (data dependent pulse width shrinkage), and non-ISI jitter. According to Tektronix, the BERTScope is the only instrument that performs this analysis.
Because of the high data rates, and short bit widths, the noise that an instrument adds to its own measurement must be small enough to product meaningful results. The jiter noise floor in the BSA286C is just 300 fs.
Because it also generates eye diagrams from incoming data streams, the BSA286C lets you make compliance tests using eye masks. A sampling of those eye masks include 40 Gbps and 100 Gbps Ethernet (IEEE 802.3ba, 16 Gbps Fibre Channel, SONET, USB 3.0, XFI and XAUI). Mask tests lets you perform jitter peak-measurements, BER contour measurements, and Q-factor analysis.
Prices start at $374,000.