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Maxim > Design Support > Technical Documents > Application Notes > Communications Circuits > APP 3471
Maxim > Design Support > Technical Documents > Application Notes > Signal Generation Circuits > APP 3471
Keywords: random-data generator, eye diagram, digital data link, op amp, comparator
APPLICATION NOTE 3471
High-Speed Random-Data Generator Facilitates
Eye Diagrams
Mar 14, 2005
Abstract: A handful of components are integrated into a circuit that creates a high-quality random data
stream that generates eye diagrams up to 62.5MHz. The circuit diagram and eye diagram are shown.
The eye diagram, one of the best figures of merit for evaluating robustness in a digital data link, shows a
single bit window (bit N), preceded by a random-value bit (N-1) and followed by a random-value bit
(N+1).
Communications-systems engineers usually have access to the sophisticated test equipment required to
measure and analyze the bit-error rate for a communications channel, but most other engineers do not.
For the latter group, the circuit of Figure 1 provides an alternative—a stimulus derived from a single
digital source.
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