Silicon CMOS Technology is now the preferred process for low power wireless
communication devices, although currently much noisier and slower than comparable
processes such as SiGe Bipolar and GaAs technologies. However, due to ever-reducing
gate sizes and correspondingly higher speeds, higher Ft CMOS processes are
increasingly competitive, especially in low power wireless systems such as Bluetooth,
Wireless USB, Wimax, Zigbee and W-CDMA transceivers. With the current 32 nm gate
sized devices, speeds of 100 GHz and beyond are well within the horizon for CMOS
technology, but at a reduced operational voltage, even with thicker gate oxides as
compensation.
This thesis investigates newer techniques, both from a systems point of view and at a
circuit level, to implement an efficient transceiver design that will produce a more
sensitive receiver, overcoming the noise disadvantage of using CMOS Silicon. As a
starting point, the overall components and available SoC were investigated, together
with their architecture.
Two novel techniques were developed during this investigation. The first was a high
compression point LNA design giving a lower overall systems noise figure for the
receiver. The second was an innovative means of matching circuits with low Q
components, which enabled the use of smaller inductors and reduced the attenuation
loss of the components, the resulting smaller circuit die size leading to smaller and
lower cost commercial radio equipment. Both these techniques have had patents filed by the
University.
Finally, the overall design was laid out for fabrication, taking into account package
constraints and bond-wire effects and other parasitic EMC effects.
| Identifer | oai:union.ndltd.org:BRADFORD/oai:bradscholars.brad.ac.uk:10454/5418 |
| Date | January 2010 |
| Creators | Logan, Nandi |
| Contributors | Not given |
| Publisher | University of Bradford, School of Engineering, Design and Technology |
| Source Sets | Bradford Scholars |
| Language | English |
| Detected Language | English |
| Type | doctoral, Thesis, PhD |
| Rights | <a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/3.0/"><img alt="Creative Commons License" style="border-width:0" src="http://i.creativecommons.org/l/by-nc-nd/3.0/88x31.png" /></a><br />The University of Bradford theses are licenced under a <a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/3.0/">Creative Commons Licence</a>. |
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