Greg Le Cheminant

Greg D. Le Cheminant is a Measurement Applications Specialist and Strategic Planner for digital communications analysis products in the Internet Infrastructure Solutions Group at Keysight Technologies. He is responsible for development of new measurement applications and products for the group’s optical communications test products. He represents Keysight on several industry standards committees.

Greg's experience at Keysight/Agilent/Hewlett-Packard began in 1985 with five years in manufacturing engineering, and the remainder in various technical marketing positions. He is a contributing author to four textbooks on high-speed digital communications and has written numerous technical articles on test related topics. He holds two patents. Greg earned BSEET and MSEE degrees from Brigham Young University.

Measurement Applications Specialist, Digital Communications Analysis at Keysight Technologies

PLL Characterization for Data Communication Components and Systems

February 28, 2024

Greg Le Cheminant and Keysight Technologies Inc.

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Phase-locked loops (PLL) are used extensively throughout modern electronic systems. In data communication systems, PLLs are used in transmitter clock multipliers and receiver clock recovery circuits. A key performance factor for the PLL is how they manage jitter. A critical PLL metric is the jitter transfer function which is based on the PLL loop bandwidth. There are several measurement methods that can be used to characterize PLL loop bandwidth and jitter transfer. When operating on digital data signals, PLL bandwidth can vary with the data pattern. In this article, Greg Le Cheminant, Keysight Technologies, focuses on test methods that allow operation on data rather than only clock signals provide very high precision and useful insights into PLL behavior.

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