Thesis
Phase noise suppression techniques for 5-6GHZ oscillator design
Washington State University
Master of Science (MS), Washington State University
2007
Handle:
https://hdl.handle.net/2376/102360
Abstract
This thesis presents novel designs of low-phase-noise 0.18µm CMOS LC voltage controlled oscillator (VCO) and quadrature VCO (QVCO) for 5-6GHz wireless communications applications. Using a new capacitor tapping technique, the phase noise of CMOS LC oscillators is lowered based on the improvement of loaded-Q improvement and suppression of flicker noise up-conversion. As a proof of concept, a 4.6GHz LC VCO using this technique is implemented and shows measured phase noise of -120dBc/Hz at 1MHz offset while drawing 7mA from a 1.8V supply. Bottom-series coupling is a low-phase-noise coupling method for QVCOs reported by other researchers recently. In this thesis, new analysis of bottom-series coupling is proposed and proves its phase noise advantage. A 5.3GHz LC QVCO using bottom-series coupling and capacitor tapping is implemented. The measured phase noise is -123dBc/Hz at 1MHz offset while drawing 10mA from a 1.8V supply and is -118dBc/Hz at 1MHz offset while drawing 10mA from a 1V supply. Bulk coupling is another coupling method reported for low-phase-noise QVCO design. Combining bulk coupling and capacitor tapping techniques, a 5.6GHz LC QVCO is implemented and shows measured phase noise of -118dBc/Hz at 1MHz offset while drawing 10mA from a 1.8V supply. Overall, all the proposed VCO and QVCOs show good measurement performance and meet the design expectation. This work also gives an overview of the operating principles and phase noise mechanism of CMOS LC VCOs and QVCOs. The important role of high-performance signal generation circuits for 5-6GHz wireless communications is also addressed.
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Details
- Title
- Phase noise suppression techniques for 5-6GHZ oscillator design
- Creators
- Yang Zhang
- Contributors
- Deukhyoun Heo (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Electrical Engineering and Computer Science, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525130201842
- Language
- English
- Resource Type
- Thesis