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Full oscillation cycle phase noise analysis of differential CMOS LC oscillators

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Author

Summary, in English

This paper analyzes the phase noise of the widely used differential LC oscillator topology and presents brief equations describing phase noise over the entire oscillation period. The findings show that if a capacitance is present at the source node of the differential pair, two phenomena occur that increase the phase noise: the switch time increases, lengthening the interval spent in a noisy balanced state and increasing the transistor noise excess factor; and at higher frequencies the unbalanced state starts to contribute phase noise. The analysis is based upon the superposition of piecewise linear equations using the EKV transistor model, which includes a concise formulation of the noise excess factor.

Publishing year

2006

Language

English

Pages

211-222

Publication/Series

Analog Integrated Circuits and Signal Processing

Volume

48

Issue

3

Document type

Journal article

Publisher

Springer

Topic

  • Electrical Engineering, Electronic Engineering, Information Engineering

Keywords

  • CMOS
  • voltage controlled oscillators
  • phase noise

Status

Published

ISBN/ISSN/Other

  • ISSN: 0925-1030