Analysis and design of injection-locked LC dividers for quadrature generation
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- 30 August 2004
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Journal of Solid-State Circuits
- Vol. 39 (9) , 1425-1433
- https://doi.org/10.1109/jssc.2004.831596
Abstract
Injection-locked LC dividers for low-power quadrature generation are discussed in this paper. Modeling the circuits as regenerative frequency dividers leads to very simple analytical expressions for the locking band, phase deviation from quadrature and phase noise. Maximizing the ratio between the injected and the biasing current is beneficial to all the above parameters whereas reducing the tank quality factor improves locking band and quadrature accuracy, though at the expense of current consumption, for given output amplitude. To validate the theory, experiments have been carried on a 0.18-/spl mu/m CMOS direct conversion IC, embedding an injection-locked quadrature generator, realized for the Universal Mobile Telecommunication System. Frequency locking range as large as 24% and phase deviation from quadrature around 0.8/spl deg/ are measured while each divider consumes 2 mA. The phase noise of the quadrature generator is determined by the driving oscillator phase noise because the dividers contribution is easily made negligible up to hundreds of megahertz offset.Keywords
This publication has 15 references indexed in Scilit:
- Injection locking LC dividers for low power quadrature generationPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2004
- A Fully Integrated 0.18->tex<$mu$>/tex<m CMOS Direct Conversion Receiver Front-End With On-Chip LO for UMTSIEEE Journal of Solid-State Circuits, 2004
- A unified model for injection-locked frequency dividersIEEE Journal of Solid-State Circuits, 2003
- A noise-shifting differential Colpitts VCOIEEE Journal of Solid-State Circuits, 2002
- Physical processes of phase noise in differential LC oscillatorsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Analysis and design of an optimally coupled 5-GHz quadrature LC oscillatorIEEE Journal of Solid-State Circuits, 2002
- Phase noise in externally injection-locked oscillator arraysIEEE Transactions on Microwave Theory and Techniques, 1997
- A simple model of feedback oscillator noise spectrumProceedings of the IEEE, 1966
- A Study of Locking Phenomena in OscillatorsProceedings of the IRE, 1946
- Fractional-Frequency Generators Utilizing Regenerative ModulationProceedings of the IRE, 1939