Download Ambient Intelligence - Impact on Embedded System Design by T Basten, M. Gellen PDF

By T Basten, M. Gellen

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Hence‚ the vast majority of transistors are in memories. Even though‚ memory power density is notoriously smaller than logic power density‚ such a disproportion between memory transistors and logic transistors leads us to conjecture that at least half of the “switching logic” power is consumed in memories and memory buses. Furthermore‚ 33% of the total power is consumed by clock generation and distribution‚ and another 8% is consumed by global repeaters and I/O drivers. Leakage is still marginal (only 2%).

3. Hummmingbirds: Wireless Base Network Devices The wireless base network occupies the middle range of computational power and energy budget. The characterizing feature of this class of devices is their wireless nature‚ that causes energy to become a design constraint. Besides energy‚ however‚ there are three other issues to be considered when evaluating possible candidates for this part of the communication infrastructure. The first issue‚ and probably the most important is related to the available bandwidth.

Individual nodes will be extremely simple objects‚ but a sensor network will contain a large number of them‚ tightly connected to the wireless base network infrastructure. Wireless sensors leverage recent advances in miniaturization and the integration of micro-electro-mechanical systems (MEMS) to build small sensors‚ optical communication components‚ and power supplies. From the operational point of view‚ wireless sensor requirements are quite atypical within the wireless domain‚ in particular when compared to usual wireless technologies: sensor networks have very high density (several nodes per square meter)‚ low-range communication (100 meters range is typically long enough)‚ and especially very low data rates (few computations per second)‚ and consequently very low bandwidth (fraction of Kbps) [24].

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