Bert Simonovich is founder of Lamsim Enterprises and an expert in innovative signal integrity and backplane solutions. He holds two patents and author of several publications. Anyone involved with the design and fabrication of high-speed circuit cards and backplanes or people who needs to estimate PCB transmission lines losses will find value in the paper Bert shared at DesignCon 2018, “A Causal Conductor Roughness Model and Its Effect on Transmission Line Characteristics”.
Listen in to Join Judy Warner and Bert discuss copper roughness and the paper he presented at DesignCon 2018.
Copper roughness is located between the laminate and the copper
- From a manufacturing perspective, the rougher the copper the better
- But for high speed, the rougher the copper the higher the loss
- If you don’t model it correctly you cannot simulate it accurately
- The Huray model dilemma - where do you get the parameters to use for the model?
- Last year’s paper was about correcting the dielectric constant due to roughness
- New model is dubbed the Cannonball-Huray model
- The effort is collaborative, building on each others’ research i.e. Rogers, Polar
- As speed goes up, material properties are more important i.e. Fiber weave effect
- Accurate modeling is very important especially with new standards and tighter margins
Links and Resources: