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Accelerate Design Verification by
Characterizing Clock Jitter Using
Phase Noise Measurements
White Paper
Introduction            Clock jitter analysis has become more necessary as data rates have increased.
                        In high-speed serial data links clock jitter affects data jitter at the transmitter,
                        in the transmission line, and at the receiver. Measurements of clock quality
                        assurance have also evolved; now the emphasis is on directly relating clock
                        performance to system performance in terms of the bit error ratio (BER).

                        This white paper reviews the role of the reference clock, the effect of clock
                        jitter on data jitter, and discusses a new measurement technique using the
                        Agilent E5001A precision clock jitter analysis application on the E5052B
                        signal source analyzer (SSA). This new method of measurement delivers
                        unprecedented measurement accuracy for ultra-low random jitter (RJ)
                        measurements and real-time jitter spectrum analysis on both the RJ and
                        periodic jitter (PJ) of components, enabling you to improve your design quality.

                        A real-time measurement capability of the new solution that speeds up your
                        design verification process is also discussed.



The role of reference   Figure 1 shows the major components of a high-speed serial data link. The
                        transmitter usually serializes a set of lower rate parallel signals into a serial
clocks in high-speed    data stream. The transmission channel through which the signal propagates is
serial applications     a combination of backplanes and cables. The receiver interprets incoming serial
                        data, re-clocks it and, usually, de-serializes it back into a parallel data stream.
                        In many high-speed serial communication systems, the reference clock is
                        considered more of a constituent than a key player, but in high-speed serial
                        data systems where system bit-rate can be in the multi-gigabit range, the
                        reference clock becomes a key component. Typically the reference clock
                        oscillates at a rate much lower than the data rate and is multiplied up in the
                        transmitter. The transmitter uses the reference clock to define the timing of
                        logic transitions in the serial data stream. The character of the reference clock
                        is included in the data transmitted. At the receiver, two different things can
                        happen. If the reference clock is not distributed, then the receiver recovers a
                        clock from the data stream 

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