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Phase Noise and Amplitude Issues of a Wide Band VCO Utilizing a Switched Tuning Resonator
Mälardalen University, Department of Computer Science and Electronics.
2005 (English)In: Proceedings - IEEE International Symposium on Circuits and Systems, 2005, 2691-2694 p.Conference paper, Published paper (Other academic)
Abstract [en]

A 3.5-5.3 GHz, low phase noise CMOS VCO with switched tuning for multi-standard radios is presented in this paper. Design of low phase noise and small amplitude variations across the operating frequency is shown to be important aspects in wide-band VCOs. An analytic expression for the output amplitude of the VCO is derived as a function of the switched capacitor resonator Q. The linear-time variant model was used for prediction of the phase noise and for deciding a proper tank current to achieve the minimum phase noise and amplitude variations across the frequency range. The results are verified in a fully integrated 0.18μm VCO with measured phase noise levels of less than -115 dBc/Hz at 1 MHz offset from the carrier while dissipating 6 mW of power. 

Place, publisher, year, edition, pages
2005. 2691-2694 p.
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-4237DOI: 10.1109/ISCAS.2005.1465181ISI: 000232002402196Scopus ID: 2-s2.0-33847709786OAI: oai:DiVA.org:mdh-4237DiVA: diva2:121526
Conference
IEEE International Symposium on Circuits and Systems 2005, ISCAS 2005; Kobe; Japan; 23 May 2005 through 26 May 2005
Available from: 2006-01-01 Created: 2006-01-01 Last updated: 2015-07-28Bibliographically approved
In thesis
1. Analysis and Design of Low-Phase-Noise Integrated Voltage-Controlled Oscillators for Wide-Band RF Front-Ends
Open this publication in new window or tab >>Analysis and Design of Low-Phase-Noise Integrated Voltage-Controlled Oscillators for Wide-Band RF Front-Ends
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The explosive development of wireless communication services creates a demand for more flexible and cost-effective communication systems that offer higher data rates. The obvious trend towards small-size and ultra low power systems, in combination with the ever increasing number of applications integrated in a single portable device, tightens the design constraints at hardware and software level. The integration of current mobile systems with the third generation systems exemplifies and emphasizes the need of monolithic multi-band transceivers. A long term goal is a software defined radio, where several communication standards and applications are embedded and reconfigured by software. This motivates the need for highly flexible and reconfigurable analog radio frequency (RF) circuits that can be fully integrated in standard low-cost complementary metal-oxide-semiconductor (CMOS) technologies.

In this thesis, the Voltage-Controlled Oscillator (VCO), one of the main challenging RF circuits within a transceiver, is investigated for today’s and future communication systems. The contributions from this work may be divided into two parts. The first part exploits the possibility and design related issues of wide-band reconfigurable integrated VCOs in CMOS technologies. Aspects such as frequency tuning, power dissipation and phase noise performance are studied and design oriented techniques for wide-band circuit solutions are proposed. For demonstration of these investigations several fully functional wide-band multi-GHz VCOs are implemented and characterized in a 0.18µm CMOS technology.

The second part of the thesis concerns theoretical analysis of phase noise in VCOs. Due to the complex process of conversion from component noise to phase noise, computer aided methods or advanced circuit simulators are usually used for evaluation and prediction of phase noise. As a consequence, the fundamental properties of different noise sources and their impact on phase noise in commonly adopted VCO topologies have so far not been completely described. This in turn makes the optimization process of integrated VCOs a very complex task. To aid the design and to provide a deeper understanding of the phase noise mechanism, a new approach based on a linear time-variant model is proposed in this work. The theory allows for derivation of analytic expressions for phase noise, thereby, providing excellent insight on how to minimize and optimize phase noise in oscillators as a function of circuit related parameters. Moreover, it enables a fair performance comparison of different oscillator topologies in order to ascertain which structure is most suitable depending on the application of interest. The proposed method is verified with very good agreement against both advanced circuit simulations and measurements in CMOS and bipolar technologies. As a final contribution, using the knowledge gained from the theoretical analysis, a fully integrated 0.35µm CMOS VCO with superior phase noise performance and power dissipation is demonstrated.

Place, publisher, year, edition, pages
Västerås: Institutionen för Datavetenskap och Elektronik, 2006. 166 p.
Series
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 25
Keyword
Electronic
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Elektronik
Identifiers
urn:nbn:se:mdh:diva-88 (URN)91–85485–05-5 (ISBN)
Public defence
2006-01-27, Beta, 14:00
Opponent
Supervisors
Available from: 2006-01-01 Created: 2006-01-01

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  • apa
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