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

Author

Bagheri, Mahdi ; Bagheri, Rahim ; Buckwalter, James F. ; Larson, Lawrence E.

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of California at San Diego, La Jolla, CA, USA

Volume

63

Issue

11

fYear

2015

Firstpage

3713

Lastpage

3726

Abstract

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.

Keywords

CMOS integrated circuits; LC circuits; MMIC oscillators; UHF oscillators; circuit tuning; coupled circuits; CMOS technology; RF quadrature oscillators; coupled oscillators; deterministic mode selection; parallel coupling; series coupling; series-coupled LC quadrature oscillator; series-coupled LC-QO; size 90 nm; tuning-range enhancement; Couplings; Impedance; Phase noise; Phase shifters; Quality of service; Tuning; Oscillator; phase noise; quadrature; tuning range;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2015.2478787

Filename

7279210