Influence of Active Device Nonlinearities on the Determination of Adler's Injection.Locking Q-Factor

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Abstract

The problem of the correct evaluation of Q-factor appearing in Adler's equation for injection-locking is addressed. Investigation has shown that recent results presented in the literature, while extending applicability of the original method, do not completely account for nonlinear effects occurring when two-port active devices are involved. To overcome such limitation, use can be made of a newly developed theory in the dynamical complex envelope domain, capable of providing first-approximation exact dynamical models of driven quasi-sinusoidal oscillators. Some preliminary results are presented here concerning a class of injection-locked oscillators with single-loop feedback type configuration. The proposed procedure permits evaluation of the nonlinear oscillator Q-factor, either analytically or numerically, depending on the complexity of the nonlinear active device model involved. The example worked out, a MOST-equipped driven Colpitts scheme, clearly illustrates the accuracy improvement achieved in the determination of the locking bandwidth stemming from the newly defined effective Q-factor, without the need to resort to the very time consuming full numerical transient envelope simulations otherwise required to this purpose.
Original languageEnglish
Publication statusPublished - 2011

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All Science Journal Classification (ASJC) codes

  • Hardware and Architecture
  • Electrical and Electronic Engineering

Cite this

@conference{bfe59728a0d4463d9501c1db971f0ffb,
title = "Influence of Active Device Nonlinearities on the Determination of Adler's Injection.Locking Q-Factor",
abstract = "The problem of the correct evaluation of Q-factor appearing in Adler's equation for injection-locking is addressed. Investigation has shown that recent results presented in the literature, while extending applicability of the original method, do not completely account for nonlinear effects occurring when two-port active devices are involved. To overcome such limitation, use can be made of a newly developed theory in the dynamical complex envelope domain, capable of providing first-approximation exact dynamical models of driven quasi-sinusoidal oscillators. Some preliminary results are presented here concerning a class of injection-locked oscillators with single-loop feedback type configuration. The proposed procedure permits evaluation of the nonlinear oscillator Q-factor, either analytically or numerically, depending on the complexity of the nonlinear active device model involved. The example worked out, a MOST-equipped driven Colpitts scheme, clearly illustrates the accuracy improvement achieved in the determination of the locking bandwidth stemming from the newly defined effective Q-factor, without the need to resort to the very time consuming full numerical transient envelope simulations otherwise required to this purpose.",
author = "Enrico Calandra and Daniele Lupo and Marco Caruso",
year = "2011",
language = "English",

}

TY - CONF

T1 - Influence of Active Device Nonlinearities on the Determination of Adler's Injection.Locking Q-Factor

AU - Calandra, Enrico

AU - Lupo, Daniele

AU - Caruso, Marco

PY - 2011

Y1 - 2011

N2 - The problem of the correct evaluation of Q-factor appearing in Adler's equation for injection-locking is addressed. Investigation has shown that recent results presented in the literature, while extending applicability of the original method, do not completely account for nonlinear effects occurring when two-port active devices are involved. To overcome such limitation, use can be made of a newly developed theory in the dynamical complex envelope domain, capable of providing first-approximation exact dynamical models of driven quasi-sinusoidal oscillators. Some preliminary results are presented here concerning a class of injection-locked oscillators with single-loop feedback type configuration. The proposed procedure permits evaluation of the nonlinear oscillator Q-factor, either analytically or numerically, depending on the complexity of the nonlinear active device model involved. The example worked out, a MOST-equipped driven Colpitts scheme, clearly illustrates the accuracy improvement achieved in the determination of the locking bandwidth stemming from the newly defined effective Q-factor, without the need to resort to the very time consuming full numerical transient envelope simulations otherwise required to this purpose.

AB - The problem of the correct evaluation of Q-factor appearing in Adler's equation for injection-locking is addressed. Investigation has shown that recent results presented in the literature, while extending applicability of the original method, do not completely account for nonlinear effects occurring when two-port active devices are involved. To overcome such limitation, use can be made of a newly developed theory in the dynamical complex envelope domain, capable of providing first-approximation exact dynamical models of driven quasi-sinusoidal oscillators. Some preliminary results are presented here concerning a class of injection-locked oscillators with single-loop feedback type configuration. The proposed procedure permits evaluation of the nonlinear oscillator Q-factor, either analytically or numerically, depending on the complexity of the nonlinear active device model involved. The example worked out, a MOST-equipped driven Colpitts scheme, clearly illustrates the accuracy improvement achieved in the determination of the locking bandwidth stemming from the newly defined effective Q-factor, without the need to resort to the very time consuming full numerical transient envelope simulations otherwise required to this purpose.

UR - http://hdl.handle.net/10447/57612

M3 - Paper

ER -