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A frequency planning and generation scheme for multi-standard wireless transceivers
KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
Firstpass Semiconductors AB.
2005 (English)In: 12th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2005: Gammarth, 11 December 2005 through 14 December 2005, 2005Conference paper, Published paper (Refereed)
Abstract [en]

This work presents a novel frequency planning scheme associated with a reference frequency generation scheme that has the potential of providing low phase noise contribution for several wireless standards including DCS1800, WCDMA II and III, DECT, WLAN a/b/g and Bluetooth. The scheme is particularly useful when implemented in future technologies and can be extended to cover newer wireless standards in newer bands of interest. It uses a single multi-band voltage-controlled oscillator (VCO) with switching inductors and high speed dividers directly generating the quadrature outputs. The VCO itself covers the frequency ranges from 4.8GHz to 6GHz and from 6.8GHz to 8GHz. Its phase noise is -136dBc/Hz at 1MHz offset from a center frequency of 1.85GHz. The design is sent for fabrication using 0.18ÎŒm CMOS.

Place, publisher, year, edition, pages
2005.
Keyword [en]
Cellular telephone systems; Local area networks; Oscillators (electronic); Phase noise; Variable frequency oscillators; Voltage dividers; Wireless local area networks (WLAN), A centers; Frequency ranges; Future technologies; High speeds; Low phase noises; Planning schemes; Quadrature outputs; Reference frequencies; Voltage-controlled oscillators; Wireless standards; Wireless transceivers, Standards
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-13983DOI: 10.1109/ICECS.2005.4633612Scopus ID: 2-s2.0-56849099704ISBN: 978-997261100-1 (print)OAI: oai:DiVA.org:kth-13983DiVA: diva2:328805
Note
QC 20100706Available from: 2010-07-06 Created: 2010-07-06 Last updated: 2010-07-06Bibliographically approved
In thesis
1. Integrated Frequency Synthesis for Convergent Wireless Solutions
Open this publication in new window or tab >>Integrated Frequency Synthesis for Convergent Wireless Solutions
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Wireless transceivers combining several standards in one unit are of key importance. In order to reach the ultimate goal of maximizing the performance-to-cost ratio of such modules, a careful study of the target application, the architecture, and the frequency planning is strongly required. One of the most challenging tasks is the implementation of the frequency synthesizer. This challenge is compounded by the traditional technical difficulties in designing frequency synthesizers as well as the new requirements that include multi-standard support. As a result, studying the upper levels of the communication system becomes mandatory in order to frame the requirements of the frequency synthesizer and to provide a viable solution from a user’s perspective for an always-best-connected scenario. Additionally, the study of the upper layers opens up new opportunities for innovation at the lower layers, especially at the physical layer where the view is traditionally restricted by some harsh requirements whose source might not be clear at least for the physical-level designer. The first aim of this work is to provide a holistic view of how an optimum user experience can be achieved and how this affects the design of frequency synthesizers for the next generation networks. The work is heavily based on the existing garden of wireless standards although it can also serve for other applications such as real software-defined radios and dynamic spectrum allocation. As a result, this work cuts a vertical path starting from the best user experience vision down to the physical layer where it expands on the design of the frequency synthesizer. It proposes a wireless front-end solution that can make the vision of an always-best-connected scenario a reality. The architecture is based on a wireless detector called Sniffer that searches for an alternative connection while the main connection is running. Not only is the Sniffer solution viable at the physical level, but it also provides a stepping stone for development towards fully-enabled multi-standard transceivers. After this, and inline with the previous vision, some important frequency synthesizer parameters are pointed out and enhancements on the phase-locked architectures are presented. This includes ways to extend the range of the frequency synthesizer and ways to make the synthesizer adaptable depending on the requirements of the wireless standards. This work leads directly to the implementation of a multi-standard frequency synthesizer where the details of the top-down design procedure are presented at several levels of abstraction. In order to round-up the work, and due to the fact that the requirements of the frequency synthesizer stretch thin the capabilities of the technology used, calibration techniques to increase the yield of such a complicated sub-system are presented, an important step towards first-pass success.

Place, publisher, year, edition, pages
Stockholm: KTH, 2008. xviii, 182 p.
Series
Trita-ICT-ECS AVH, ISSN 1653-6363 ; 08:07
Keyword
wireless, transceiver, Bluetooth, DECT, GSM, 3G, LTE, WLAN, WiMAX, multi-standard, vertical handover, Sniffer, frequency synthesizer, phase-locked loop, PLL, sigma-delta, calibration
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-9486 (URN)978-91-7415-142-8 (ISBN)
Public defence
2008-11-20, sal D, Forum, KTH, Isafjordsgatan 39, Kista, 14:00 (English)
Opponent
Supervisors
Note
QC 20100706Available from: 2008-11-10 Created: 2008-11-07 Last updated: 2010-07-06Bibliographically approved

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