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http://dx.doi.org/10.5573/IEIESPC.2015.4.3.149

A Capacitively Coupled Multi-Stage LC Oscillator  

Park, Cheonwi (School of Mechatronics, Gwangju Institute of Science and Technology)
Park, Junyoung (Samsung Electronics)
Lee, Byung-Geun (School of Mechatronics, Gwangju Institute of Science and Technology)
Publication Information
IEIE Transactions on Smart Processing and Computing / v.4, no.3, 2015 , pp. 149-151 More about this Journal
Abstract
Coupling with a ring of capacitors introduces in-phase coupling current in multi-stage LC oscillators, increasing coupling strength and phase spacing accuracy. Capacitive coupling is effective at high-frequency applications because it increases coupling strength with the operating frequency. However, capacitive loading from the ring lowers operating frequency and reduces the tuning range. Mathematical expressions of phase noise and phase spacing accuracy with capacitive coupling are examined here, and transistor-level simulations confirm the effectiveness of the capacitive coupling.
Keywords
LC oscillator; Multi-stage; Phase noise; Capacitive coupling;
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