Agilent offers jitter tolerance test solution
An
Agilent Technologies Europe product story
Edited by the Engineeringtalk editorial team
Oct 29, 2009
Agilent Technologies has released a four-tap de-emphasis signal converter N4916B, an ultra-flexible SSC injection and a SATA ISI channel to its J-Bert N4903B high-performance serial Bert.
The capabilities enable research and development (RandD) and test engineers to characterise receiver ports and channels of multi-gigabit serial bus interfaces, such as Quickpath Interconnect (QPI), Hypertransport, PCI Express, Displayport, SerialATA, USB 3.0, CEI, 10GBASE-KR, 40GBASE-KR and memory interfaces.
The de-emphasis technique is used in the transmission of digital electrical signals at gigabit data rates.
De-emphasis is a signal pre-distortion to compensate for signal degradations that occur when transmitting electrical signals with gigabit rates over PC board traces, backplanes or long cables.
Agilent's de-emphasis signal converter, the N4916B, allows users to emulate transmitter de-emphasis with one pre and two post cursors, as well as individually adjust de-emphasis levels up to 12dB.
With its DC-coupled outputs, the signal converter even tolerates unbalanced pattern streams.
The N4916B is transparent to jitter, enabling emulation of real-world de-emphasis and jitter conditions that a receiver is expected to tolerate.
Agilent's de-emphasis signal converter can be used as front end for J-Bert N4903A/B, Parbert or other gigabit pattern generators.
Besides its de-emphasis capabilities, the N4916B offers a clock-doubling option, which enables error, jitter and eye analysis with J-Bert N4903B of transmitters using half-rate clocks.
The spread spectrum clocking (SSC) injection is becoming more common for high-speed interconnects.
SSC modulates the operating frequency of a circuit slightly to spread its radiated emissions over a range of frequencies.
J-Bert N4903B's SSC option now provides more flexible and arbitrary SSC injection capabilities that can be combined with sinusoidal jitter injection, helping RandD engineers emulate worst-case and real-world SSC conditions, especially for SATA, SAS and USB 3.0 receivers.
The Agilent SATA ISI Channel N4915-60001 helps RandD and test engineers to reproduce precise SATA compliant stress conditions for the receiver stress test when used in combination with J-Bert N4903B.
'By adding multi-tap de-emphasis, ultraflexible SSC and SATA ISI channel, we can simplify the accurate characterisation of the next generation of serial interfaces operating above 5Gb/s,' said Jurgen Beck, general manager of Agilent's digital photonic test product line.
Features of the Agilent N4916B de-emphasis signal converter include: easy-to-emulate transmitter de-emphasis with individually adjustable de-emphasis of 0.0dB to 12.0dB in 0.1dB steps for one pre and two post cursors; tolerates unbalanced pattern and is jitter transparent; ability to optimise the receiver's jitter budget by compensating for signal degradations caused by the test setup, cabling and test board ('de-embedding') by using signal de-emphasis; flexible usage as de-emphasis front-end for J-Bert N4903A/B, Parbert or other gigabit pattern generators; and accurate eye, jitter and error analysis of half-rate clocked transmitters with J-Bert N4903B by using the clock-doubler option.
Features of the Agilent J-Bert N4903B Software 6.1 and SATA ISI Channel include: robust receiver designs by emulating real-world SSC effects via file upload of arbitrary SSC profiles; compliant SAS and SATA injection of SSC with an expanded SSC range of up to 10,000ppm in centre-spread mode; support of up-, down-, and centre-spread SSC; and simplified setup for USB 3.0 receiver stress test by simultaneous injection of SSC and SJ from J-Bert N4903B.
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