Technical Articles

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Awarded the Best Paper Award at DesignCon 2024, this paper demonstrates that, for correlated data with PDN impedances in the sub-mΩ level, the impedance extracted from same-location top-bottom measurement can be significantly different from same-side adjacent via pair measurement, even if the physical separation is in the order of a mm

This paper, awarded the Best Paper Award at DesignCon 2024, explores what is meant by bandwidth during the standardization process, the implications of test and verification attached to certain bandwidth requirements, as well as differences between acquisition range, band limited filters, and s-parameters for time domain processing. 

Making accurate time interval error (TIE) or phase noise measurements of a periodic signal presents a number of challenges. The program jitterhist includes algorithms and settings to provide accurate TIE measurement results for periodic waveforms with significant amounts of high-frequency measurement/modulation noise as well as for waveforms having multiple unit intervals of low frequency modulation when the time span of the samples includes more than one period of the modulation. 

This article describes a phase noise analysis tool that creates a numerical model from discrete phase noise data. The tool includes an adaptive algorithm to identify spurious deterministic components in the data while also creating a physics-based numerical model for the random noise component.

In order to study what is needed and what has been adopted for the next Ethernet speed node of 200 Gbps per lane, this DesignCon 2024 paper, a recipient of the Best Paper Award, investigates different FEC schemes such as end-end, concatenated, and segmented FECs, examining how these different FEC schemes affect signal integrity and performance in different end applications. 

This DesignCon 2024 paper, a Best Paper Award winner, introduces a new process utilizing heuristics to determine laminate anisotropy based on Dk/Df construction tables provided by laminate suppliers.

This DesignCon paper showcases high-speed design and testing schemes for LPO systems from a system perspective while also presenting the testing results, data, and product architecture of a linear direct-drive switch in conjunction with an LPO module system.

This paper comprehensively addresses the numerous challenges presented when designing a power distribution network for a scalable 2000 Amp power supply and provides a complete process for designing, simulating, and validating a 2000 Amp core power rail. 

In this field guide, David Banas of Keysight explores COM from specification to practice. From mapping out the pitfalls to avoid to explaining the discrepancies between the specification and the MATLAB code, Banas guides the link designers through a successful first experience with COM.

This article covers the importance of proper calibration, measurement, and de-embedding to ensure that the final capacitor model is free of errors, allowing an accurate representation of the PDN used in simulation. While capacitor models may play a seemingly minor role in the overall system design, the impact of capacitor models can significantly impact the system design and, importantly, design sign-off.