Ultra-Compact Wireless Sensing System
Wireless sensors can become much more useful as they get smaller. They are less intrusive, can be put on many more subjects, and therefore enable new kinds of sensing applications, especially in wearable ones.
What is challenging is not just making a small system, but to make the small system work well.
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•battery: very difficult to shrink; limited energy capacity; difficult to recharge wirelessly; aging effect
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•antenna: also difficult to have both high efficiency and small size at the same time.
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•limited memory: RAM takes up most of the chip area and power, but small RAM makes it difficult to have OS, run applications, and manage communication protocols.
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•expandability: to eliminate redundant effort and maximize reuse, the platform should support an expansion interface for connecting to different types of sensor modules. However the expansion connector takes up much room and can be fragile.
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•packaging: waterproof packaging is often requested but it is difficult to fit
