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How to Test PSRR, PSNR and PSMR for Sensitive Applications, Including Optical Transceivers

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Presented by: Steven M. Sandler, Managing Director, Picotest

Duration: 29 minutes

Originally presented on October 5, 2022 during EDI CON Online 2022

For a copy of this paper please inquire at info@picotest.com Abstract: The impact of power supply noise on high performance systems is well established, and as a result, many applications now require power supply sensitivity testing to assure robust designs. There are numerous obstacles to overcome, beginning with nomenclature. Different applications use different naming conventions for power supply sensitivity. In power electronics, it is referred to as PSRR or Power Supply Ripple Rejection, while in RF it is referred to as PSMR or Power Supply Modulation Ratio, and in high-speed transceivers it is referred to as PSNR or Power Supply Noise Rejection.

The most recent QSFP-DD optical transceiver specification, for example, requires noise to be injected onto the power supply input over a frequency range of 40Hz-10MHz. This is challenging at the very least, leaving engineers to not only perform the test, but to develop the methods and equipment required.

In this session, Steven M. Sandler will present the requirements, measurement challenges, and proposed solution, including the test setup, for performing these difficult tests. Presenter Bio: Steven M. Sandler has been involved with power system engineering for more than 40 years. Steve is the founder and CEO of PICOTEST.com, a company specializing in instruments and accessories for high performance power system and distributed system testing. He frequently lectures and leads workshops internationally on the topics of Power Integrity and Distributed Power System Design. He is a Keysight Certified EDA expert.

Steve publishes articles and books related to power supply and power distribution network performance and power systems modeling. His most recent book is “Power Integrity Using ADS” (2020) and frequently lectures on all power related topics.


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