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PDN ground offset error when doing measurements

March 13, 2014 by Rolf Ostergaard

Is there a risk of ground offset error when doing PDN measurements? This is another question that popped up after the story about what happens when the test points are moved in a network analyzer setup for measuring bypass (or PDN – Power Distribution Network) on a board is: Would it change anything if the… Read more

Filed Under: Power Integrity (PI/PDN) Tagged With: Impedance, Network Analyzer, PDN

Using Cadence SigXplorer for Parallel Termination

February 6, 2014 by Rolf Ostergaard

Some of the EE-Training courses use the Cadence SigXplorer tool, which is a very handy IBIS*) simulator. I have previously written about other similar tools like the simulator-part of Altium and Mentor’s Hyperlynx. It’s not really important what tool you use, it’s more how you use it and what you do with the results. IBIS… Read more

Filed Under: Simulation Tagged With: Cadence, Impedance, Parallel Termination, SI, Simulation

High Speed Via

November 28, 2013 by Rolf Ostergaard

How do you make high-speed vias that work at +56Gpbs? Recently a question came up: How big the clearance hole (anti-pad) needed to be for a through-hole via to have acceptable performance with 56Gbps signals on a high layer count board (22 layers / 2.4mm thickness). I decided to compile all the information I had… Read more

Filed Under: Vias Tagged With: antipad, capacitance, clearance hole, Impedance, inductance

TDR Measurement Using LeCroy SPARQ

May 24, 2013 by Rolf Ostergaard

In this quick video I will show how to do a simple impedance test trace TDR measurement on a PCB using a homemade probe and the LeCroy SPARQ. This nice piece of equipment can do all kinds of fancy stuff including de-embedding of cables (which I used here) and gating away the effects of probes… Read more

Filed Under: Measurement Tagged With: Equipment, Impedance, LeCroy, TDR

Polar Instruments as Sponsor

May 22, 2013 by Rolf Ostergaard

Thanks to Polar Instruments, you may now get a free signal integrity course – as a new sponsor, Polar Instruments offer to reimburse the course fee if you buy their software. The software that Polar offers will be demonstrated as part of the Stockholm SI Week on Wednesday morning from 8:00 to 9:00 – this… Read more

Filed Under: Announcements Tagged With: Impedance, Polar Instruments, SI Week, Stackup

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