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Jitter Measurements with Decision Feedback Equalization

Kalev Sepp  (Signal Integrity Consultant, Sepson Analytics LLC)

John Calvin  (Senior DataCom Product Planner, Keysight)

Location: Ballroom F

Date: Thursday, January 30

Time: 2:50pm - 3:30pm

Track: 12. Applying Test & Measurement Methodology, 08. Measurement, Simulation & Improving Jitter, Noise & BER (Pre & Post FEC)

Format: Technical Session

Pass Type: 2-Day Pass, All-Access Pass, Alumni All-Access Pass - Get your pass now!

Vault Recording: TBD

Audience Level: All

Advanced equalization consisting of CTLE and DFE is needed for current and future generations of serial data standards to compensate for loss and maintain required bit error rate. The jitter decomposition methodology that emerged few decades ago was the first attempt to better understand the source of timing variations and effect on link performance. While such analysis after CTLE is straightforward, measuring jitter after DFE still is not fully understood or standardized. The paper will discuss models and practical measurement considerations for jitter measurements after DFE as well as implications for transmitter compliance testing in various standards.


Understand how jitter transforms and affects the receiver with decision feedback equalizer. Learn about different DFE implementations and behavioral models used in compliance testing.

Intended Audience

Basic understanding of serial data link, transmitter and receiver equalization, CTLE and DFE operation is desirable.

Presentation Files