An earlier work by the authors (Molki et al., 1995) discussed the adiabatic heat transfer coefficient of rectangular blocks situated in an in-line array. In real circuit boards, heat is generated by a number of electronic components. The temperature of each component is affected by two factors, self-heating and thermal wake effect. Self-heating is the temperature rise due to … [Read more...]
Thermal challenges in the telecom and networks industry
Figure 1: Telecom Equipment Operating EnvironmentsThere are two main reasons for doing thermal design in the telecommunication industry. The first is to ensure functionality of the equipment and system when subjected to extreme environments. The second is to ensure high dependability of the network. While doing thermal design, many challenges must be kept in mind: the … [Read more...]
The history of power dissipation
Figure 1. Transistor counts on Intel processors from inception to present superimposed on Moore's prediction. In his fascinating book, "Visions," Michio Kaku [1] predicts a future driven by silicon and quantum computers. Based on the information we have today, it is intriguing to speculate how such a highly silicon-based society might function and evolve. Being a thermal … [Read more...]
Thermal conductivity of composite materials
A composite material can be defined as a material in which two or more different materials are bonded together. It is sensible to make a distinction between macrocomposites and microcomposites. The first group usually has a layered structure, and PCBs are the main application. The second group looks uniform to the naked eye; materials from this group are often used for packages … [Read more...]
Adjusting temperatures for high altitude
Many companies design products with electronics that must function reliably at high altitude, typically 1,500m (5,000 ft) or 3,000m (10,000 ft) above sea level. Estimating the increase in operating temperatures is necessary to design and qualify such products. There are a variety of corrections used to account for this effect, many of which sacrifice accuracy for simplicity. … [Read more...]
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