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According to Agilent, the new capabilities enable R&D and test engineers to accurately characterize receiver ports and channels of multigigabit serial bus interfaces, such as Quickpath Interconnect (QPI), Hypertransport, PCI Express, DisplayPort, SerialATA, USB3, 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 new 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 12.0 dB. With its DC-coupled outputs, the signal converter tolerates even 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 new 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 arbitrary SSC injection capabilities that can be combined with sinusoidal jitter injection, helping R&D engineers emulate worst-case and real-world SSC conditions, especially for SATA, SAS and USB3 receivers.
The new Agilent SATA ISI Channel N4915-60001 helps R&D and test engineers reproduce precise SATA compliant stress conditions for the receiver stress test when used in combination with J-BERT N4903B.
The Agilent N4916B de-emphasis signal converter with optional clock doubler is available now. Agilent's J-BERT N4903B software rev. 6.1 for SSC/SJ injection (Option J11) can be downloaded from agilent.com/find/jbert at no charge. The N4915-60001 SATA ISI Channel is available now.
((Comments on this story may be sent to health@closeupmedia.com))
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