On phase noise in quadrature cross-coupled oscillators

L.B. Oliveira; A. Allam; I.M. Filanovsky; J.R. Fernandes; IEEE

doi:10.1109/ISCAS.2005.1465167

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Conference proceeding

On phase noise in quadrature cross-coupled oscillators

L.B. Oliveira, A. Allam, I.M. Filanovsky, J.R. Fernandes and IEEE

2005 IEEE International Symposium on Circuits and Systems (ISCAS), pp.2635-2638 Vol. 3

2005

DOI: https://doi.org/10.1109/ISCAS.2005.1465167

Abstract

Circuit simulation

Circuit stability

Coupling circuits

cross-coupled oscillator

Delay

Frequency

Inductors

Mathematical model

Oscillators

Phase noise

Relaxation oscillator

Stability analysis

A cross-coupled relaxation oscillator has two outputs of the same frequency, which are in quadrature. In this paper a comparative study of the phase noise in a cross-coupled relaxation oscillator is given. We present a high level (system) study of the oscillator and analyse the oscillator stability. The derivation proves analytically that cross-coupling reduces the influence of a perturbation (noise) on the oscillator output. Both high-level and circuit simulations at 5GHz are presented to confirm the theoretical results. Close to 10dB improvement in phase noise performance due to coupling was found, and the phase noise performance compared with that of a coupled LC oscillator was achieved.

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Details

Title: On phase noise in quadrature cross-coupled oscillators
Creators - without role: L.B. Oliveira - I.S.Tecnico/TNESC-ID Lisboa, Portugal
A. Allam - University of Alberta
I.M. Filanovsky - University of Alberta
J.R. Fernandes
IEEE
Publication Details: 2005 IEEE International Symposium on Circuits and Systems (ISCAS), pp.2635-2638 Vol. 3
Publisher: IEEE
Identifiers: 9929578908331
Academic Unit: Taibah University
Language: English
Resource Type: Conference proceeding