UBM Tech
UBM Tech

Henry Ott comes to Austin

-September 09, 2011

Great news for you fire-ravaged good ol’ boys in Texas. Henry Ott, the EMC, noise, and signal integrity guru is giving his course October 25-27, 2011 at the Wyndham Garden Hotel in Austin. Cost is $1495, but you can get in for $1295 if you register and pay by Sept 16. This does not include a room at the hotel, which are available for $94 a night. The hotel is holding a block of rooms until Oct 3. Henry is having some EMC companies exhibit on the 26th, so you may find the vendor that can solve your EMC problems. The suppliers include test laboratories, test equipment companies, and component manufacturers. He is also accepting sponsorship placement on his course binder. All you big billion dollar multinationals should immediately place an ad; Henry is a real treasure to the engineering community.


I met Henry at the AES (audio engineering society) back in 2006. He used to work at Bell Labs in the long-lines department. He really knows his stuff. He reminds me of Jim Williams in that he really does not like to fill blackboards with math, he wants you to understand the principles of noise and EMC, not have you plug-and-crank formulas all day. Henry has worked with some world-class mathematicians who do love math. Together they have defined the equations that describe the behavior of strip line, microstrip and most recently, asymmetric stripline.


Henry is one of the few consultants that understand system-level design problems. While the semiconductor companies are telling you to cut ground planes up into analog and digital, Henry explains why you are better off keeping a continuous ground plane and how you should use placement and routing discipline to keep noise out of your precious analog circuits. In addition to getting a great notebook of the presentation, you will get a copy of Henrys latest edition of his great book Electromagnetic Compatibility Engineering.


Here is a picture I took at Henry’s Silicon Valley seminar a year ago,. Oh yeah, lunch is included, and it is first-rate. That is Hosai Omarkhil from Apple on the left. Yeah, she was tight-lipped about how Apple does EMC and signal integrity, typical Apple, so no help there. They should call the whole company the Brat-pack after its inglorious spoiled brat ex-CEO.

Who should attendThis course is directed towards electrical engineers. However, mechanical engineers, reliability and standards engineers, technical managers, systems engineers, regulatory compliance engineers, technicians, and others who need a working knowledge of electromagnetic compatibility engineering principles will also benefit from the course.


Here is the course content:


Electric and magnetic field coupling, crosstalk. Cable types: coax, twisted pair and ribbon cables. Cable shielding and terminations.


Why do we ground? Ground systems: single point, multipoint, hybrid. Ground loops. Return current paths, split reference planes. EMC grounding philosophy. AC power grounds.


Noise sources, PCB layout, power distribution, ground grids, characteristics of ground planes. Decoupling capacitors: value, placement, resonance and limitations.


Alternative decoupling methods, use of distributed decoupling capacitance, power supply isolation, effect of paralleling capacitors. Embedded PCB capacitance.


Radiated emission mechanisms. Fourier spectrum. Methods of controlling differential-mode emission. Clock dithering. Cancellation techniques.


Basic C-M filter theory. Filter source and load impedances. Single and multi-stage filters. Ferrite chokes versus shunt capacitors. Effectiveness of various filter configurations. Filter mounting and layout.


What is a transmission line? Transmission-line effects, transmission-line radiation, and matching. How currents flow on transmission lines. Series, shunt and AC terminations. Simulation.


Defining the problem, A/D converter requirements, return current paths, split ground planes, PCB partitioning, bridges & moats, routing discipline.


RF immunity: circuits affected, PCB layout, audio rectification, RFI filters. Transient immunity: circuits affected, the three-prong approach, keeping transient energy out, protecting the sensitive devices, designing software/firmware for transient immunity.


AC power line conducted emission models, switching power supplies, parasitic capacitance, layout. Common-mode and differential-mode conducted emission, common-mode chokes, saturation. Power line filters.


Absorption and reflection loss. Seams, joints, gaskets, slot antennas, and multiple apertures. Waveguides below cutoff, conductive coatings. Cabinet and enclosure design

Loading comments...

Write a Comment

To comment please Log In