Design of Q-enhanced Class-C VCO with robust start-up and high oscillation stability | Zendy

Mi Tian | Zendy; Zhigong Wang | Zendy; Jian Xu | Zendy; Changchun Zhang | Zendy

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Design of Q-enhanced Class-C VCO with robust start-up and high oscillation stability

Author(s) -

Mi Tian,

Zhigong Wang,

Jian Xu,

Changchun Zhang

Publication year - 2014

Publication title -

ieice electronics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.178

H-Index - 36

eISSN - 1349-9467

pISSN - 1349-2543

DOI - 10.1587/elex.11.20140982

Subject(s) - dbc , voltage controlled oscillator , phase noise , total harmonic distortion , capacitor , oscillation (cell signaling) , cmos , figure of merit , electronic engineering , q factor , materials science , electrical engineering , voltage , optoelectronics , engineering , resonator , biology , genetics

A novel topology of Q (quality factor)-enhanced dynamically self-biasing Class-C VCO is proposed in this article. It introduces a bridging capacitor to enhance the quality factor of the oscillator. The enhancement of the quality factor suppresses the squegging phenomenon and the harmonic distortion, and thus improves the phase noise and oscillation stability. The prototype of the proposed circuit was fabricated in SMIC 0.18 μm CMOS process and the measurement results showed a low phase noise of −125 dBc/Hz@1MHz from 3.331GHz carrier with a total power consumption of 3.36mW from a 1.2V supply. The proposed work exhibited an excellent Figure of Merit (FoM) of −190 dBc/Hz.

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