Controlled Impedance

Controlled Impedance Articles:

Which Impedance Calculator is Right ? Randy Clemmons

What is Characteristic Impedance - Eric Bogatin

The How and Why of Obtaining Accurate Impedance Calculations - Lee Ritchey

Resistive Nickel Losses - AP17 Polar Instruments

Optimizing Impedance Discontinuities of SMD Pads  Altera - AN-530

Online Trace Impedance Calculator Links:

cgi-wcalc - Dan McMahill

EMC LAB INFO

Circuit Sage

Mantaro Impedance Calculators  Java - PCB Related Calculations

Desktop Trace Impedance Calculator Links:

AWR TxLine 2003 (Free) Excellent Tool

Rogers MWI-2014 Software (Free)

Saturn PCB Toolkit (Free) - PCB Design Calculator

UltraCAD Design Inc.  (Free / Buy) - Douglas Brooks
ICD has a Stackup Calculator and Offers a 14 Day Evaluation

VIA Impedance:  

Designing Controlled-impedance Vias  Thomas Neu - Texas Instruments

The Poor Man’s PCB Via Modeling Methodology  Bert Simonovich's Design Notes

Including Tolerance in Mathcad Calculations

Including Tolerance in Mathcad Calculations

Electromagnetics Explained - PDF

Electromagnetics Explained.pdf (Ron Schmitt)

Power Distribution System - Douglas Brooks

Power Distribution System - Douglas Brooks

EM Rectangular Cavity Modes Applet

EM Rectangular Cavity Modes Applet

Peelable Solder Mask - Pink Lady

Peelable Solder Mask: RoHS Compliant Peelable Solder Mask

Metric Stuff - Tom Hausherr

Tom has been a big contributor in the PCB Design Community. Tom has created many useful tables and written numerous excellent papers:

Inch to Metric Conversion Tables for PCB Design

PCB Mounting Holes