1. Vocabulary of Signal Integrity
High-Speed Digital Design: Opening Lecture.
HSDD Seminar (2015): 1.1-1.5.
[EE basics, management] Definition of Signal Integrity. Relation to EMI. Purpose of Studying Signal Integrity. Overview of Program.
HSDD Seminar (2015): 1.11-1.27.
[capacitance, EE basics, inductance] Your Schematic shows only the intended flow of signal power. Currents Form Loops. Every Loop of Current Has Inductance. Behavior of Inductance. Impedance Magnitude of Inductor. Effect of Inductor. Importance of Returning Current Path. Proximate Conductors Share Capacitance. How Capacitors Behave. Impedance Magnitude of Capacitor. Effect of Capacitor. Approximate Values of Capacitance. Practical Circuits are Littered with Parasitic Elements.
Frequency Content of Digital Signals.
HSDD Seminar (2015): 1.28-1.41.
[bandwidth, EE basics, ringing, rise time] Data Band. Baud Interval Band (Rectangle = Step). Rising/Falling Edge Band. Frequencies That Matter for Digital Design. Meaning of "Frequency Response". Effect of Parasitics. Conceptual Frequency Response of Every PCB Trace. Relation of Knee Frequency to Circuit Performance. Effect of Shrinking Rise/Fall Time. International Technology Roadmap for Semiconductors (ITRS).
Effects of Delay.
HSDD Seminar (2015): 1.42-1.59.
[delay, layer stack] Propagation Delay in Various Media. Example of Mixed Dielectric. Dielectric Properties of PCB Traces. Outer-Layer PCB Traces Are Faster. Distributed vs. Lumped Systems. Physical Length of Rising Edge. Pi Model of Transmission Line. Uses for The Pi Model.
HSDD Seminar (2015): 1.60-1.81.
[capacitance, crosstalk, inductance] Step Response Theory. How Resistive Loading Changes Circuit Delay. Mutual Capacitance and Mutual Inductance. Measurement of Mutual Coupling. Comparison of Inductive and Capacitive Crosstalk. A Faraday Cage Fixes Capacitive Coupling. Mutual Inductance is a Current-Flow Problem. Improving the Return Path Fixes Inductive Crosstalk. Why Many Engineers Think First About Capacitance.
2. Properties of Gates
Properties of Gates.
HSDD Seminar (2015): 2.1-2.10.
[ground bounce] Voltage Margin Budget. SSO Noise (Ground Bounce). SSO Test Setup. Theory of Operation. How SSO Noise Affects Inputs.
Factors That Reduce Ground Bounce.
HSDD Seminar (2015): 2.8-2.17.
[differential signaling, ground bounce, power systems, split planes] A Well-dispersed Array of Pwr/Gnd Pins. Differential Inputs. Shared Reference. Split-Power Architecture.
BGA Package Examples.
HSDD Seminar (2015): 2.18-2.21.
[chip packaging] Plastic Ball Grid Array (PBGA). Flip-Chip. Upside-down with heat spreader.
IBIS I/O Buffer Information Specification.
HSDD Seminar (2015): 2.22-2.28.
[simulation] Live discussion of the purpose and appropriate use of modeling software.
IBIS Simulation with Gaussian Edges.
HSDD Seminar: 2.29-2.33.
[rise time, simulation] Simulation artifacts caused by the use of piecewise-linear (PWL) Spice sources. Presentation of Gaussian source useful for eliminating the artifacts.
3. Using Your Oscilloscope
Scope Probes and Loading.
HSDD Seminar (2015): 3.1-3.9.
[capacitance, probes] FET-input probe. Differential Active Probe. Resistive-input probe. Input Impedance of Probes. Effect of Probe on Signal Under Test. Which Probe is Best?
4. Transmission Lines
5. Solid Plane Layers
How Solid Plane Layers Control Crosstalk.
HSDD Seminar (2015): 5.1-5.10.
[crosstalk, reference planes, transmission line] Early Computers vs. Multilayer PCB. Microstrip Response to Changing Magnetic Field. Magnetic Field Animations. Do Not Give Your PCB Vendor Full Control Over H and W. How Much Crosstalk Can You Take?. Where Simulation Fails Us.
The Path of Returning Signal Current.
HSDD Seminar (2015): 5.12-5.17.
[reference planes, returning signal current, transmission line] The High-Speed Path Can Look Pretty Strange. Distribution of High-Frequency Current Underneath a Signal Trace. What about Capacitance?. Crosstalk Versus Trace Separation Experiment. Crosstalk Over a Solid Ground Plane (waveforms). Crosstalk Over a Solid Ground Plane (graph).
Ground Plane Slots.
HSDD Seminar (2015): 5.24-5.32.
[crosstalk, reference planes, returning signal current, transmission line] Traces Passing Over a Ground Plane Slot. Crosstalk From Ground Plane Slots. Connector Layout Slots. Crosstalk Versus Trace Separation Experiment. Crosstalk Over a Slotted Ground Plane (waveforms). Crosstalk Over a Slotted Ground Plane (graph). Why Wasn’t the Lower Plane Very Effective?
HSDD Seminar (2015): 5.33-5.42.
[crosstalk, guard trace, layout] Power and Ground Fingers. Cross-Hatched Ground Grid. Guard Trace on a Two-Layer Board. Guard Trace on Multilayer Board (classroom demo covers slides 5.37 - 5.42).
Split Power Planes.
HSDD Seminar (2015): 5.43-5.46.
[crosstalk, layout, power systems, split planes] Crossing a Split Power Plane Boundary. Use of Stitching Capacitors. Measuring Split-Plane Crosstalk.
Crosstalk NEXT and FEXT examples.
HSDD Seminar (2015): 5.55-5.66.
[crosstalk, examples] Measuring NEXT and FEXT. Effect of trace length, height, and separation. Stripline FEXT. Effect of terminations..
HSDD Seminar (2015): 6.4-6.15.
[circuit topology, termination] Function of Split Termination. Design Constraints. Thevenin Equivalent Model of End Termination. Design Process. Design Solution. Reflections from a Capacitive Load. Effect of Stub Hanging Beyond End Termination.
Series Termination (Source Termination).
HSDD Seminar (2015): 6.16-6.27.
[circuit topology, termination] Halving and Doubling of Signal Amplitude. Value of External Series Resistor. No Clock Receivers Allowed in Middle of Series-Terminated Line. What’s That Plateau?. What’s That Glitch?. Heavy Capacitive Loads on Series and End-Terminated Lines. How Close Must a Series-Terminator Be to the Driver?
Comparison of Termination Styles.
HSDD Seminar (2015): 6.29-6.41.
[circuit topology, examples, termination] End Termination. Series Termination. Power Dissipation. AC Termination. Transmission Line States. Dynamic Termination. Proper Design of AC Termination. Comparison of Terminations (chart). Double-series termination.
Effect of Capacitive Loads.
HSDD Seminar (2015): 6.42-6.52.
[capacitance, circuit topology, reflections] Single Load in Middle of Line. Multiple Loads. Slowing Down the Rise Time. Adjusting the End Termination. Key Equations. Idea for Design.
Gigabit Ethernet Examples.
HSDD Seminar (2015): 6.74-6.82.
[dielectric loss, dispersion, examples, reflections, skin effect, transmission line] Serial interface at 1.25 Gb/s. Showing dielectric loss and skin effect. Showing effect of vias and mismatched terminations. Showing effect of both-ends termination vs. single-end.
HSDD Book (1993): Chap 7.
[vias] Chapter 7 from the book High-Speed Digital Design: A Handbook of Black Magic was not filmed.
(pp. 249-262) Book
8. Rock-Solid Power
HSDD Seminar (2015): 8.14-8.19.
[bypass capacitors, examples, inductance, layout] Surface-Mounted Configurations. Inductance of Surface-Mounted Layouts (table). New Surface-Mounted Packages. AVX Interdigitated Capacitor (IDC).
Arrays of Capacitors.
HSDD Seminar (2015): 8.20-8.26.
[bypass capacitors, power systems] Modeling a Complete Power System. Dual-Value Capacitor Arrays. Choose the Smallest Package and the Biggest Value.
HSDD Seminar—Extra Material
High-Speed Digital Design covers the important and timely issues involving both high-speed digital design and signal integrity. Developed specifically for engineers and designers who work with high-speed digital signals, this workshop will give you the power to instantly recognize and solve many of today's high-speed design problems.
|termination||circuit topology||reference planes||returning signal current|
|power systems||bypass capacitors|
Who should watch this course?
- Digital logic designers
- System architects
- Chip designers
- EMC specialists
- Applications engineers
- Printed wiring layout professionals
- Managers and sales people in the high-speed digital industry
- Anyone who works with digital logic at high speeds (20MHz to 20GHz and beyond)
This is a practical two-day seminar course. It is filled with examples, explanations, and classroom demonstrations. Anyone who works with high-speed digital signals will understand and benefit from the material presented. It presents material related to the book, High-Speed Digital Design: A Handbook of Black Magic, but treated in a different way and with different examples. The book, being 447 pages in length, obviously delves into the subject matter in greater detail. Think of the seminar as an introduction and, if you like it, get the book for on-the-job reference.
How to view this course
The author recommends that you view no more than one hour at a time. It may help for you to print out the notes pages for each lecture and take written notes. The sections in the notes marked Points to Remember are not often highlighted in the lecture, but offer good opportunities for personal thought and reflection.
The three courses provide a certain degree of redundancy. Each begins with a section designed to make each attendee aware of certain basic concepts and vocabulary peculiar to that course. Where there is overlap, the author emphasizes different aspects of the core material, uses different examples, and approaches the subjects from varying angles. He recommends that you watch all three courses, all the way through, including all the extra movies.
The course materials cover much more material than could possibly be presented in the six days of lecture that we were able to film. Dr. Johnson arranged the slides with extra material to give himself the flexibility to focus on specific issues of interest to each particular class and to respond to questions. We include the full set of student materials here for your reference, even though some of those slides were not filmed. To help you keep on track, slide numbers appear on the right side of the course contents listing.
In addition to the student course materials, the Collection includes a full set of instructor materials in Powerpoint format. The instructor materials include original source artwork that may be of interest to those attempting to teach these courses. The necessary animation files, should you wish to use them independant of the lectures, are also available.