Welcome to Signal Integrity

Welcome to Signal Integrity. EDN has featured Howard Johnson’s “Signal Integrity” column in our magazine for years. We are now transitioning his column into a blog to allow for more conversation and idea exchange in the comments section.
 
Howard Johnson, PhD, of Signal Consulting, frequently conducts technical workshops for digital engineers at Oxford University and other sites worldwide. You can review some of his recently published columns below.
 
Series resonance in power systems
March 1, 2012
In a sinusoid-based system, such as an FM or an AM radio, resonating power-supply components can provide truly astonishing benefits.

Parallel resonance
February 2, 2012
A scene that involves pushing a child on a swing helps explain the concept of resonance.

Quadrature-connector layout
January 5, 2012
The quadrature alignment of this differential connector dramatically reduces crosstalk.

Quadrature-via layout
December 1, 2011
Quadrature layout does nothing to mitigate common-mode crosstalk, but at least it nails the differential mode.

What quality is—and isn't
November 3, 2011
What will you see when you look "under the hood" of the product you are designing?
 
Be sure to visit this blog often and share your thoughts in the comments section, found at the end of each post.