Publication

Phase noise in bipolar and CMOS VCO's - an analytical comparison

Adil Koukab
2006
Conference Papers

Abstract

As RF IC design has become more prevalent and more demanding, the need for a more precise VCO phase noise model has arisen. For both MOS and bipolar VCO's new formulas are still being proposed to model the phase noise, which is a key factor for a precise oscillator. In this paper, a previous phase noise model for a bipolar VCO as presented in A. Tasic and W. A. Serdijn (2002) is refuted and the formulas developed for MOS VCO phase noise calculations based in J. J. Rael and A. Abidi (2000) are adapted to bipolar VCO. Then, the results are compared and some conclusions are drawn for the comparison of these oscillators

Official source

https://infoscience.epfl.ch/entities/publication/18104990-c772-4f30-aa6c-752588c7cc9a

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Adil Koukab
2006
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/18104990-c772-4f30-aa6c-752588c7cc9a

About this result

Related concepts (31)

Phase-locked loop

A phase-locked loop or phase lock loop (PLL) is a control system that generates an output signal whose phase is related to the phase of an input signal. There are several different types; the simplest is an electronic circuit consisting of a variable frequency oscillator and a phase detector in a feedback loop. The oscillator's frequency and phase are controlled proportionally by an applied voltage, hence the term voltage-controlled oscillator (VCO).

Voltage-controlled oscillator

A voltage-controlled oscillator (VCO) is an electronic oscillator whose oscillation frequency is controlled by a voltage input. The applied input voltage determines the instantaneous oscillation frequency. Consequently, a VCO can be used for frequency modulation (FM) or phase modulation (PM) by applying a modulating signal to the control input. A VCO is also an integral part of a phase-locked loop. VCOs are used in synthesizers to generate a waveform whose pitch can be adjusted by a voltage determined by a musical keyboard or other input.

Phase noise

In signal processing, phase noise is the frequency-domain representation of random fluctuations in the phase of a waveform, corresponding to time-domain deviations from perfect periodicity (jitter). Generally speaking, radio-frequency engineers speak of the phase noise of an oscillator, whereas digital-system engineers work with the jitter of a clock. Historically there have been two conflicting yet widely used definitions for phase noise.

Related publications (2)

Phase noise in bipolar and CMOS VCO's - an analytical comparison

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