Although phase change materials (PCM) were introduced nearly twenty years ago, it was not until the development of the high-powered Pentium processor that this class of interface material gained widespread acceptance. The large quantities of heat produced by these processors necessitated a carefully designed thermal path where all of the thermal resistances were minimized. For … [Read more...]
Diamonds are a Thermal Designer's Best Friends
Different forms of carbon, such as processed natural graphite, pyrolytic graphite, diamond-like carbon, and synthetic diamond, offer lots of possibilities for maximizing conductive heat transfer.Synthetic diamond has already found its place as a common solution for heat spreaders inside semiconductor laser components, where temperature stabilization is of utmost importance for … [Read more...]
High Resolution, Real Time Micro-thermal Imaging — Steady State and Pulse Measurements on Microscopic Semiconductor Targets
Thermal imaging of microscopic targets has evolved over the past 20 years to the point where real time "true-temperature" mapping with 50 milliKelvin sensitivity and 2.75 �m spatial resolution is possible. Recently, the capability to study and evaluate high frequency transient pulses has been added. Infrared imaging methods provide unequaled ease and flexibility for … [Read more...]
Thermal Issues in GaAs Analog RF Devices
Wireless communication and advanced radar systems require circuitry that can operate at frequencies greater than 2 GHz and at high power levels. Analog gallium arsenide (GaAs) semiconductors are frequently used in these applications and present additional challenges for thermal engineers compared to silicon semiconductors. Whereas thermal characterization modeling and … [Read more...]
The thermal conductivity of rubbers/elastomers
In the May 2001 issue, this column discussed the thermal conductivity of unfilled plastics. The interested reader may have noticed that the category of rubbers/elastomers was missing. This was not without reason. The user of these elastic materials should be aware that the final thermal resistance (which is, of course, from an engineering point of view, the more important … [Read more...]
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