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

By Alyssa Apsel, Xiao Wang, Rajeev Dokania

ISBN-10: 1461418445

ISBN-13: 9781461418443

ISBN-10: 1461418453

ISBN-13: 9781461418450

This e-book covers the basic ideas at the back of the layout of ultra-low strength radios and the way they could shape networks to facilitate a number of purposes inside healthcare and environmental tracking, due to the fact that they could function for years off a small battery or maybe harvest strength from the surroundings. those radios are distinctive from traditional radios in that they have to function with very restricted assets and occasional overhead. This ebook offers a radical dialogue of the demanding situations linked to designing radios with such limited assets, in addition to basic layout ideas and sensible techniques to imposing operating designs. insurance contains built-in circuit layout, timing and keep an eye on concerns, basic idea at the back of low strength and time area operation, and network/communication protocol considerations.

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The design tolerances will eventually require the LNA bandwidth to be limited to few MHz, requiring very high Q on-chip filters with precise center frequencies in order to achieve the benefits associated with the scaled data rate and FCC compliance. For example a 1 MHz bandwidth at 1 GHz, means a Q of 1,000, while the practical realizable Q’s are of the order of 10–20 with on-chip 30 2 Approaches to Low Power Radio Design inductors. MEMS based filters with higher Q’s have been shown, but they suffer from thermal and process variations and also large insertion loss.

Recent developments in continues wave radio designs have shown that by modifying the design architecture at the receiver, and having mixer as the first stage, can enable one to control the amplification-bandwidth of the baseband-LNA (or, gain stage), thereby enabling one to design baseband-LNAs with low amplification bandwidth that can trade power at the receiver by trading bandwidth, resulting in a different FOM for these baseband-LNA designs [13, 14]. The analysis associated with relative power comparison of the Impulse Radio as compared to the CW radio taking into account this recent development in continuous wave receiver designs, is given in the section below.

Pulse-shaping is also important for better inter-band isolation and side-lobe rejection as well as improved spectral efficiency. Thus, low power pulse-shaping techniques that avoid the use of external filters or baluns is an active area of research [12]. 1 Pulse-Shaping Requirements For an impulse transmitter, complying with FCC is not the only performance metric that is important. We also need to consider spectral efficiency, out-of-band emission and side-lobe rejection. 1 Spectral Efficiency The spectral efficiency of a pulse is an important performance parameter.

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


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