Conference proceeding
A low-phase-noise LC QVCO with bottom-series coupling and capacitor tapping
2008 IEEE International Symposium on Circuits and Systems (ISCAS), pp.1000-1003
05/2008
Handle:
https://hdl.handle.net/2376/117072
Abstract
A novel LC Quadrature VCO (QVCO) employing bottom-series coupling and capacitor tapping to suppress phase noise at low voltage operation is presented. Placing the coupling transistors at the bottom of the switching pairs, the bottom-series coupling method yields zero resonator-phase-shift (RPS) which maximizes the quality factor (Q) of the resonator. The capacitor tapping technique allows a large signal swing at the resonator outputs while maintaining the current sources and the turned-on switching transistors in saturation. Therefore, the signal-to-noise ratio (SNR) and the loaded Q of the resonator are both boosted resulting in a low phase noise. The proposed QVCO achieves the figure of merit (FOM) of 189 dBc/Hz with a phase noise of -120.3 dBc/Hz at 1-MHz offset when operating at 6 GHz, and draws 5 mA from a 1-V power supply.
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Details
- Title
- A low-phase-noise LC QVCO with bottom-series coupling and capacitor tapping
- Creators
- Yang Yang Zhang - Sch. of Electr. Eng. & Comput. Sci., Washington State Univ., Pullman, WAPeng Peng Liu - Sch. of Electr. Eng. & Comput. Sci., Washington State Univ., Pullman, WADeukhyoun Deukhyoun Heo - Sch. of Electr. Eng. & Comput. Sci., Washington State Univ., Pullman, WA
- Publication Details
- 2008 IEEE International Symposium on Circuits and Systems (ISCAS), pp.1000-1003
- Publisher
- IEEE
- Identifiers
- 99900548393401842
- Language
- English
- Resource Type
- Conference proceeding