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Design issues in CMOS differential LC oscillators

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2 Author(s)
Hajimiri, A. ; California Inst. of Technol., Pasadena, CA, USA ; Lee, T.H.

An analysis of phase noise in differential cross-coupled inductance-capacitance (LC) oscillators is presented. The effect of tail current and tank power dissipation on the voltage amplitude is shown. Various noise sources in the complementary cross-coupled pair are identified, and their effect on phase noise is analyzed. The predictions are in good agreement with measurements over a large range of tail currents and supply voltages. A 1.8 GHz LC oscillator with a phase noise of -121 dBc/Hz at 600 kHz is demonstrated, dissipating 6 mW of power using on-chip spiral inductors

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:34 ,  Issue: 5 )
RFIC Virtual Journal, IEEE