Electronic data exchange represents a very important link for integrating PCB electrical layout, analysis and mechanical design. It has become, in fact, the basis for enhanced economic and industrial growth. The Intermediate Data Format (IDF) is the most used file format for exchanging printed circuit assembly (PCA) data between electrical and mechanical CAD/CAE systems and for … [Read more...]
Thermal Calculations for Multi-chip Modules
Due to the flexible manufacturing processes for producing BGA packages, there has been an explosion of new package designs, many of which contain more than one integrated circuit chip [1]. Existing industry standards for IC package thermal characterization apply only to single-chip packages. This Calculation Corner will present some techniques for calculating the junction … [Read more...]
The Thermal Conductivity of Air at Reduced Pressures and Length Scales
In several earlier issues of Electronics Cooling, I discussed the thermal conductivity of air as a function of temperature and pressure. Therein, it was stated that the temperature dependence cannot be neglected, but that the pressure dependence, under 'normal' conditions, is virtually absent. But what is 'normal' these days? In 'normal' electronic systems we, indeed, need … [Read more...]
Thermal joint conductance for graphite materials
The heat flow across a metal/interstitial elastic-layer/metal joint is a very important problem in many microelectronic applications. It is generally known that when two surfaces are brought together, intimate solid-to-solid contact occurs only at discrete parts of the interface. Therefore, the actual contact area of pressed surfaces represents a very small fraction of the … [Read more...]
There's something for everybody on talk radio
I was doing my Sunday morning (2 a.m.) radio call-in show about electronics cooling (Hot Air on the Air with Tony K), when I heard a familiar voice on the line. "Herbie in Hereford," I greeted the caller, "You're on the air with Hot Air." "First time caller, long time listener . . .," the caller said. "Wow. There must be an insomnia epidemic," I interrupted. Johnny, the … [Read more...]
- « Previous Page
- 1
- …
- 143
- 144
- 145
- 146
- 147
- …
- 176
- Next Page »