IEIE Transactions on Smart Processing and Computing

The Institute of Electronics and Information Engineers (대한전자공학회)
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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)
  • Received : 2015.05.30
  • Accepted : 2015.06.15
  • Published : 2015.06.30
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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.

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References

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