M8061A Multiplexer 2:1 With De-Emphasis 32 Gb/s

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R&D and test engineers who need to characterize serial interfaces of up to 28.4 Gb/s can use the M8061A 2:1 Multiplexer with optional de-emphasis to extend the rate of J-BERT N4903B pattern generator. For the most accurate receiver characterization results, the M8061A provides four calibrated de-emphasis taps, which can be extended to eight taps, built-in superposition of level interference and Clock/2 jitter injection. The M8061A is a 2-slot AXIe module that can be controlled via USB from J-BERT’s user interface.

Application examples for M8061A:

• Optical transceivers such as 100GBASE-LR4, -SR4 and -ER4, 32G Fibre Channel
• SERDES and chip-to-chip interfaces, such as OIF CEI
• Backplanes, cables, such as 100GBASE-KR4, -CR4
• Next generation computer buses, such as PCI Express ® 4

Emulate transmitter de-emphasis with up to 8 taps

Many multi gigabit serial interfaces use transmitter de-emphasis to compensate for electrical signal degradations caused by printed circuit boards or cables between the transmitter and the receiver ports. R&D and test engineers who need to characterize receiver ports under realistic and worst case conditions require a pattern generator that allows to accurately emulate transmitter de-emphasis with adjustable multi-tap de-emphasis levels. The M8061A can be used in combination with J-BERT N4903B as shown below.

This setup shows how to emulate transmitter de-emphasis up to 28.4 Gb/s with M8061A and J-BERT N4903B. (4 tap de-emphasis with 1 pre and two post-cursors is shown)

De-embed signal degradations caused by the test set up and fixtures using de-emphasis

Minimizing the influence of the test environment is a challenge especially if bit rates exceed 20 Gb/s. To de-embed the signal degradations caused by cables, test fixtures, adapters, etc, the de-emphasis technique is commonly used. M8061A is the only instrument that offers up to 8 tap de-emphasis up to 28.4 Gb/s, allowing compensation of signal degradations in very fine steps.

PCI Express is a registered trademark of PCI-SIG

• Expands data rate of J-BERT N4903B pattern generator up to 28.4 Gb/s
• Adjustable positive and negative de-emphasis for up to 8 taps, optional
• Internal superposition of interference for common-mode and differential mode
• Transparent to jitter generated by J-BERT
• Clock/2 jitter can be added
• Electrical idle
• Control from J-BERT N4903B user interface via USB