Signal Integrity 802.3ck VSR SERDES Lines
Hi, my name is Hatem Akel. I'm an RF application engineer at Ozen Engineering, Inc. Thank you for joining this webinar. Several topics will be discussed. This presentation is about signal integrity. In this tutorial, we will demonstrate how to use ANSYS tools to perform signal integrity analysis, focusing on pluggable transceivers. However, the techniques shown today can be applied to various fields beyond service lanes or transceivers.
Table of Contents
- Definition of Signal Integrity
- Main Goals of the Webinar
- Introduction to Transceivers and Standards
- HFSS Modeling and Ideas
- Signal Integrity and Post-Processing
1. Definition of Signal Integrity
Signal integrity refers to the set of specifications that must be met by a communication link or a section of it to ensure sufficient communication throughput. This is often characterized by a low bit error rate in digital communication links. For RF engineers using HFSS and circuit design tools, signal integrity involves:
- Identifying and minimizing defects in communication link components.
- Building a reliable communication link by cascading components.
- Debugging measurements effectively.
2. Main Goals of the Webinar
Our goal is to provide templates for designers to verify their designs against specifications. These templates replicate lab measurements of transceivers, including circuits and plots categorized by measurement points. The advantage is the ability to simulate and instantly see effects on the system, such as bit error rate and signal error rate.
3. Introduction to Transceivers and Standards
Pluggable transceivers are devices used in optical communication links, acting as RF to optical converters and vice versa. They include both transmitter and receiver sections. Common transceiver standards include SR, BR, LR, ER for optical link length, and SFP, QSFP, CFP, OSFP for size and pin location. In this presentation, we focus on QSFP DD transceivers, which have 8 TX and 8 RX channels.
4. HFSS Modeling and Ideas
In HFSS modeling, we focus on the serializer and deserializer (SERDES) lines within the transceiver. These lines carry high data rate signals constructed from multiple low bitrate signals. The model includes the end section of the transceiver, the connector, and the Module Compliance Board (MCB). It's crucial to include these components to verify transceivers against specifications.
5. Signal Integrity and Post-Processing
Signal integrity involves several phases, including identifying defects, building reliable links, and debugging measurements. Our templates provide tools for these phases, allowing you to simulate and verify designs efficiently. The templates include various circuits and graphs for linear frequency, transient, and eye solvers, along with standards for verification.
5.1 Transmitter and Receiver Specifications
Transmitter specifications focus on passive measurements like differential return loss and termination mismatch. Receiver specifications include eye measurements, using tools like verify eye analysis and quick eye analysis to calculate bit error rates and plot eye diagrams.
5.2 System and Debugging Tools
System tools help measure internal transceiver components, while debugging tools assist in identifying issues like crosstalk. Crosstalk debugging involves analyzing near-end crosstalk to pinpoint problem areas within the model.
5.3 Equalization
Equalization is allowed by standards to improve signal quality. Continuous Time Linear Equalizer (CTLE) and Decision Feedback Equalizer (DFE) are used to compensate for insertion loss and memory effects, respectively.
For more information and to download the template, please contact us or check our website for updates. Thank you for your attention.
Title: Signal Integrity in 802.3ck VSR SERDES Lines OK, maybe we should start now. I think the rest can join later on. Hi, so my name is Hatem Akel. I'm an RF application engineer at Ozen Engineering. Thank you for joining this webinar. Several topics will be discussed.
This presentation is about signal integrity. So in this tutorial, we will show how to use ANSYS tools to do signal integrity with a focus on pluggable transceivers. However, whatever we are going to show today can be applied to many different fields.
It's not limited to serializer/deserializer (SERDES) lines or just to transceivers.
The agenda is as follows: 1. Definition of signal integrity 2. Main goal of this webinar 3. Introduction to transceivers and their standards 4. HFSS modeling 5. Signal integrity and post-processing Let's begin. --- 1. Definition of signal integrity In the real world, signal integrity for system engineers is a set of specifications that must be met by a communication link or a section of a communication link to ensure sufficient communication throughput.
This is often referred to as a signal with a low bit error rate. For RF engineers like us who use HFSS and circuit designer, signal integrity means three things: a. Identifying and fixing or minimizing any defect in all the components of a communication link b.
Building a reliable communication link by cascading these components c.
Being able to debug measurements Today's webinar is all about these three phases, providing you with easy-to-use tools to do signal integrity professionally and efficiently. --- 2. Main goal of this webinar Our goal is to provide you with templates for designers to help them verify their designs against all the specifications.
These templates will duplicate what you will see in the lab when you measure your product, your transceiver, or pluggable transceivers.
The templates contain circuits of all kinds and plots that you can use to see the effect on the system, the effect on the bit error rate, and signal error rate, as well as the specifications. --- 3. Introduction to transceivers and their standards Pluggable transceivers are devices used in optical communication links.
They are RF to optical converters and vice versa, with both the transmitter and receiver sections on the optical side. There are many different forms of transceivers, and we will focus on the QSFP DD, which has 8 TX channels and 8 RX channels.
Each transceiver follows a specific standard, which describes everything in these transceivers, including mechanical, optical, and electrical specifications.
These standards also describe how to measure and characterize the transceivers. --- 4. HFSS modeling We will model the SERDES lines in the transceiver, which are the surdice lines. These lines carry one signal made from hundreds of low-frequency, low-bitrate signals in kilobits per second.
We will simulate the end section of the transceiver plus the connector plus the MCB in HFSS, focusing on the RF lines. --- 5. Signal integrity and post-processing We will discuss the simulation bandwidth and how to verify the design against specifications.
We will also talk about the circuit design process, cascading components, and using the right solver in the HFSS model. --- Thank you for your attention. We hope you find this webinar informative and helpful in your work with signal integrity and pluggable transceivers.
