Title :
A low-phase-noise wide-tuning-range quadrature oscillator in 65nm CMOS
Author :
Li, Guansheng ; Afshari, Ehsan
Author_Institution :
Sch. of Electr. & Comput. Eng., Cornell Univ., Ithaca, NY, USA
Abstract :
In this paper, we present a low-phase-noise wide-tuning-range quadrature oscillator using an LC-ring resonator. It achieves low phase noise by employing passive coupling between multiple stages and at the same time it covers a wide tuning range by switching between two resonant modes. Furthermore, the problem of oscillation frequency uncertainty which is a common issue in oscillators with multiple oscillation modes is addressed by the novel mode switching method. The proposed design is verified by a four-stage LC-ring prototype in a 65nm CMOS process, which covers 2.78GHz-5.00GHz with phase noise FoM of 186dB at 3.66GHz and >;180dB across the entire tuning range. This demonstrates the best performance among wide-tuning-range quadrature VCO´s at this frequency range.
Keywords :
CMOS integrated circuits; microwave oscillators; resonators; voltage-controlled oscillators; CMOS; LC-ring resonator; four-stage LC-ring prototype; frequency 2.78 GHz to 5 GHz; low-phase-noise wide-tuning-range quadrature oscillator; mode switching method; oscillation frequency uncertainty; passive coupling; resonant mode; size 65 nm; wide-tuning-range quadrature VCO; CMOS integrated circuits; Phase noise; Prototypes; Resonant frequency; Switches; Tuning;
Conference_Titel :
Custom Integrated Circuits Conference (CICC), 2012 IEEE
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-4673-1555-5
Electronic_ISBN :
0886-5930
DOI :
10.1109/CICC.2012.6330682
