By Stephen H. Hall
A synergistic method of sign integrity for highspeed electronic layout
This booklet is designed to supply modern readers with an knowing of the rising highspeed sign integrity concerns which are growing roadblocks in electronic layout. Written by way of the key specialists at the topic, it leverages thoughts and methods from nonrelated fields similar to utilized physics and microwave engineering and applies them to highspeed electronic design—creating the optimum mix among conception and sensible functions.
Following an creation to the significance of sign integrity, bankruptcy insurance comprises:
 Electromagnetic basics for sign integrity

Transmission line basics

Crosstalk

Nonideal conductor types, together with floor roughness and frequencydependent inductance

Frequencydependent houses of dielectrics

Differential signaling

Mathematical standards of actual channels

Sparameters for electronic engineers

Nonideal go back paths and through resonance

I/O circuits and types

Equalization

Modeling and budgeting of timing jitter and noise

approach research utilizing reaction floor modeling
each one bankruptcy comprises many figures and various examples to assist readers relate the innovations to daily layout and concludes with difficulties for readers to check their figuring out of the fabric. complex sign Integrity for HighSpeed electronic Designs is appropriate as a textbook for graduatelevel classes on sign integrity, for courses taught in for pro engineers, and as a reference for the highspeed electronic dressmaker.
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Additional resources for Advanced signal integrity for highspeed digital designs
Example text
However, for wave propagation in other media, such as the dielectric of a printed circuit board (PCB), the speed of light and the intrinsic impedance are calculated using the relative permittivity εr and relative permeability µr , which simply describe the properties of the material relative to freespace values. Note that both µr and εr are unitless values that are real numbers for lossfree media but become complex for lossy media, as described in Chapters 5 and 6. The speed of light (referred to as the phase velocity for media other than free space) and the intrinsic impedance in a medium is calculated as νp = √ η ≡ 1 c =√ µ r µ 0 εr ε0 µ r εr µr µ0 = εr ε0 µ E = ε H m/s ohms (252) (253) Note that for free space, µr and εr are both defined to be unity.
In fact, communication between components in a highspeed digital design necessitates the intentional propagation of electromagnetic waves guided by transmission lines and the prevention of energy propagation across unintentional pathways (such as crosstalk) or in unwanted signal propagation modes. Without a detailed study of wave propagation, the study of signal integrity would become impossible. 1 Wave Equation In subsequent chapters it will become necessary to analyze electromagnetic wave propagation only in terms of magnetic or electric fields because they are related directly to the voltage and current propagating on transmission lines, through vias, or across planes.
Where J = 0 for a sourcefree medium and D = εE (for now, we assume that P = 0): ∂Hy ∂Ex ∂Hx ay − ax = 0 + ax ε ∂z ∂z ∂t Grouping into vector components yields ∂Hy ∂Ex = ax ε ∂z ∂t ∂Hx ay =0 ∂z −ax The nonzero components of the equations above can be grouped to see the contributions in both the x and ydirections. ay ∂Hy ∂Ex = −µ ∂z ∂t (229) ∂Hy ∂Ex =− ∂t ∂z (230) ax ε Equations (229) and (230) symbolize an important concept used throughout signal integrity analysis, which is that the electric and magnetic fields are orthogonal and there are no components in the zdirection.