Class-C Harmonic CMOS VCOs, With a General Result on Phase Noise

@article{Mazzanti2008ClassCHC,
  title={Class-C Harmonic CMOS VCOs, With a General Result on Phase Noise},
  author={Andrea Mazzanti and Pietro Andreani},
  journal={IEEE Journal of Solid-State Circuits},
  year={2008},
  volume={43},
  pages={2716-2729}
}
A harmonic oscillator topology displaying an improved phase noise performance is introduced in this paper. Exploiting the advantages yielded by operating the core transistors in class-C, a theoretical 3.9 dB phase noise improvement compared to the standard differential-pair LC-tank oscillator is achieved for the same current consumption. Further benefits derive from the natural rejection of the tail bias current noise, and from the absence of parasitic nodes sensitive to stray capacitances… CONTINUE READING
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