ECEN 4224/ ECEN 5224 High Speed Digital Design


Covers the design, analysis and measurement of interconnects for high speed digital, high speed serial link and PDN applications; including transmission lines, vias, connectors; measurements using scopes, VNA and TDR instruments, analysis of signal waveforms and S-parameters in the time and frequency domains, the use of EM field solvers and circuit simulators, and good design methodology.


Credits: 3 credit hours, Elective course


Prerequisites: ECEN 3400 Electromagnetic fields and waves


Recommended prerequisites, ECEN 3410 Electromagnetic waves and transmissions line


Textbook, “Signal and Power Integrity- Simplified, E. Bogatin, 2009



Course objectives:


Provide an introduction to the current approaches used in the industry for signal integrity design and analysis



Lecture schedule:



  1. High speed problems and methodology
    1. design process
    2. 6 families of SI problems
    3. Role of analysis to explore design tradeoffs
    4. Lab: intro to QUCS, Polar 2D, HyperLynx, sonnet, HFSS, SI Studio


  1. Transmission lines and signals
    1. Data patterns, eyes
    2. Return currents
    3. Characteristic impedance, input impedance in time and frequency
    4. Lab: exploring design space with Polar and HyperLynx


  1. Reflections and circuit simulations
    1.  voltage and current waves
    2.  terminations
    3.  routing
    4. Lab: reflection animations, circuit simulations in QUCS and HyperLynx


  1. Discontinuities
    1. length and rise time
    2. modeling as transmission lines
    3. stubs and vias
    4. lab: via modeling with HFSS, HyperLynx


  1. Differential pairs
    1. differential and common impedance
    2. modes, terminations
    3. mode conversion
    4. lab: HyperLynx and QUCS: diff and common signal propagation and reflection


  1. S-parameters and the TDR
    1. S-parameter in time and frequency domain
    2. Return and insertion loss patterns
    3. Differential S-parameters
    4. Lab: simulating and analyzing S-parameter files with QUCS, SI Studio, HyperLynx


  1. Attenuation and loss
    1. Loss and jitter
    2. describing attenuation
    3. attenuation and rise time
    4. lab: diff pair design and attenuation


  1. High speed serial links
    1. Four problems: loss, reflections, mode conversion, cross talk
    2. eyes and masks
    3. jitter
    4. lab: eye simulation using HyperLynx and SI Studio


  1. High speed scope measurements and jitter analysis
    1. Scope features, data acquisition rate, BW
    2. Fixturing and probes
    3. Jitter decomposition
    4. Lab: SI studio analysis of serial links and eye diagrams



  1. Cross talk
    1. Capacitive an inductive coupling
    2. Near and far end
    3. Pathological: FEXT, broadside coupling
    4. Lab: HyperLynx analysis of NEXT and FEXT


  1. Ground bounce
    1. Total inductance of the return path
    2. Plane transitions and via to via cross talk and capacitors
    3. Switching noise in the package
    4. Lab: QUCS analysis of ground bounce, HyperLynx analysis of via cross talk


  1. PDN
    1. The Bandini mountain
    2. Impedance profiles
    3. Capacitors and planes
    4. Lab: impedance profiles with QUCS and planes with HyperLynx PI


  1. Class presentations
    1. Myths
    2. How good are rules of thumb or approximations
    3. Establishing design Guidelines
    4. In the news