Tuning-Range Enhancement Through Deterministic Mode Selection in RF Quadrature Oscillators

Quadrature oscillators (QOs) based on parallel or series coupling mechanisms produce ambiguous phase relationships between the coupled oscillators. Deterministic mode selection is presented and analyzed for a series-coupled LC quadrature oscillator ( LC-QO) and leveraged to increase the tuning range...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2015-11, Vol.63 (11), p.3713-3726
Main Authors: Bagheri, Mahdi, Bagheri, Rahim, Buckwalter, James F., Larson, Lawrence E.
Format: Article
Language:English
Subjects:
Couplings
Impedance
Oscillator
Phase noise
Phase shifters
quadrature
Quality of service
Tuning
tuning range
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Summary:Quadrature oscillators (QOs) based on parallel or series coupling mechanisms produce ambiguous phase relationships between the coupled oscillators. Deterministic mode selection is presented and analyzed for a series-coupled LC quadrature oscillator ( LC-QO) and leveraged to increase the tuning range of the QO. Series-coupled LC-QOs have been implemented in a 90-nm CMOS technology. Measured results show a frequency tuning range of 94% for a center frequency of 1.3 GHz, 60% for the oscillator operating at 3.7 GHz, and 52% for the oscillator operating at 4.4 GHz.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2015.2478787