3.1.2. Device Selection
Device families have different power characteristics. Many parameters affect the device family power consumption, including choice of process technology, supply voltage, electrical design, and device architecture.
Power consumption also varies in a single device family. A larger device with more transistors consumes more static power than a smaller device in the same family. In devices that employ global routing architectures, dynamic power can also increase with device size.
The choice of device package also affects the ability of the device to dissipate heat, and you may need to use a different cooling solution to comply with junction temperature constraints.
Process variation can affect power consumption. Process variation primarily impacts static power, because sub-threshold leakage current varies exponentially with changes in transistor threshold voltage. Therefore, you must consult device specifications for static power, and not rely on empirical observation. Process variation has a weak effect on dynamic power.
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