Design of Ultra-Low Power Impulse Radios by Alyssa Apsel, Xiao Wang, Rajeev Dokania

By Alyssa Apsel, Xiao Wang, Rajeev Dokania

This ebook covers the basic ideas in the back of the layout of ultra-low energy radios and the way they could shape networks to facilitate quite a few purposes inside healthcare and environmental tracking, considering the fact that they might function for years off a small battery or perhaps harvest power from the surroundings. those radios are exact from traditional radios in that they need to function with very limited assets and occasional overhead. This e-book presents a radical dialogue of the demanding situations linked to designing radios with such limited assets, in addition to primary layout options and useful methods to imposing operating designs. assurance contains built-in circuit layout, timing and regulate issues, basic idea at the back of low energy and time area operation, and network/communication protocol considerations.

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28. Each stage uses a differential common-source amplifier with tunable LC load, optimized for switching transients of ~ 1 ns. 5 mW in a 90 nm IBM process. The choice of the number of gain stages is made based on the trade-off between power consumption, Rx-sensitivity, tunability, and bandwidth. Since power increases roughly quadratically with gain in a single stage, use of more cascaded lower gain stages enables the designer to reduce the power, while achieving high gain and bandwidth specifications.

11 Study of the Effect of Non-Idealities Non-idealities, particularly associated with process-variation, can change the timing as well as spectral characteristics of the transmitted pulse and so warrant further study. 11 Study of the Effect of Non-Idealities 53 Fig. 20 Power vs data rate of different published schemes and comparision to our work. (ref. are [7, 12, 17–22] in order) Fig. 21 Energy/bit vs data rate of different published schemes and comparison to our work (ref. 1 Effect of Pulse-Width Variation The pulse-width of the impulse wavelet controls the 10-dB bandwidth of the transmission spectrum.

17b), where all the sensor nodes are within the reach of the cluster-head, the nodes can configure their mode of communication to facilitate a time-multiplexed dedicated channel originating between any two nodes. 5 Timing Requirements for an Impulse Radio Design: Synchronization 33 Fig. 17 a Decentralized multi-hop and b centralized cluster-head based network Fig. 18 shows one such timing scheme. In this type of configuration nodes in their immediate vicinity get local dedicated non-overlapping (time division multiple access) channels, on which communication can proceed between the clusterhead and various nodes.

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