Abstract
It is necessary to reduce the crosstalk noise in high-speed signaling channels. In the channel routing area, the tabbed routing pattern is used to mitigate far-end crosstalk (FEXT), and the electrical length is controlled with a time domain reflectometer (TDR) and time domain transmission (TDT). However, unlike traditional channels having uniform width and space, the width and space of tabbed routing changes by segment, and the capacitance and inductance values of tabbed routing also change. In this paper, we propose a tabbed routing equivalent circuit modeling method using the segmentation approach. The proposed model was verified using 3D EM simulation and measurement results in the frequency domain. Based on the calculated inductance and capacitance parameters, we analyzed the insertion loss, FEXT, and self-impedance in the frequency domain, and TDT and FEXT in the time domain, by comparing the values of these metrics with and without tabbed routing. Using the proposed tabbed routing model, we analyzed tabbed routing with variations of design parameters based on self- and mutual-capacitance and inductance.
Highlights
Memory signaling systems require high-density and high-speed signaling in highperformance computing systems in applications for artificial intelligence and big data management
A high-speed signaling channel with tabbed routing has an advantage in terms of signal integrity while degrading the coupling between channels
From the comparison of the measurements and 3D EM simulation, the proposed model was successfully verified in the frequency domain
Summary
Memory signaling systems require high-density and high-speed signaling in highperformance computing systems in applications for artificial intelligence and big data management. From an engineering perspective, the choice of mitigating FEXT by increasing the gap between channels or applying a new structure is not straightforward For these reasons, a new routing pattern, named tabbed routing, was proposed and applied to micro-strip lines of high-performance server PCBs by Intel Corporation [3]. In [4], a generalized equation-based tabbed routing model is proposed using the segmentation method with an asymmetrical coupled micro-strip line. The proposed tabbed routing model was verified by comparison of the insertion loss and FEXT for two tabbed routing designs, using 3D EM simulation and measurement results up to 20 GHz in the frequency domain. We discuss the application of the highspeed signaling channel with tabbed routing to high-performance computing systems from the perspective of signal integrity.
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call