Regenerative Current Amplifier using van der Pol Approximation

Luís Augusto Bica Gomes de Oliveira; DEE Group Author

doi:10.1109/MWSCAS.2011.6026686

Regenerative Current Amplifier using van der Pol Approximation

Luís Augusto Bica Gomes de Oliveira, DEE Group Author

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

When van der Pol oscillator linear damping parameter is positive then this oscillator becomes a nonlinear resonant amplifier of high sensitivity for small ac signals with the frequencies located in the vicinity of the oscillator natural frequency. The gain characteristic of this amplifier is similar to the gain characteristic of logarithmic amplifier; the sensitivity is high for small signals and, due to the nonlinear damping parameter, is reduced for the signals of higher amplitudes. Application of this amplifier in regenerative receiver requires a precise control of the linear term, i.e. the Q-factor of linear low-level signal operation. The proposed amplifier is realized using a modified active inductor circuit with compensation of resistive component in input admittance; this approach provides the required high value and good control of Q-factor. The simulations of amplifier selectivity characteristics are given for the design example using 130 nm CMOS technology.

Original language	Unknown
Title of host publication	Midwest Symposium on Circuits and Systems Conference Proceedings
Pages	1-4
ISBN (Electronic)	978-1-61284-855-6
DOIs	https://doi.org/10.1109/MWSCAS.2011.6026686
Publication status	Published - 1 Jan 2011
Event	IEEE 54th International Midwest Symposium on Circuits and Systems (MWSCAS) - Duration: 1 Jan 2011 → …

Conference

Conference	IEEE 54th International Midwest Symposium on Circuits and Systems (MWSCAS)
Period	1/01/11 → …

Access to Document

10.1109/MWSCAS.2011.6026686

Cite this

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title = "Regenerative Current Amplifier using van der Pol Approximation",

abstract = "When van der Pol oscillator linear damping parameter is positive then this oscillator becomes a nonlinear resonant amplifier of high sensitivity for small ac signals with the frequencies located in the vicinity of the oscillator natural frequency. The gain characteristic of this amplifier is similar to the gain characteristic of logarithmic amplifier; the sensitivity is high for small signals and, due to the nonlinear damping parameter, is reduced for the signals of higher amplitudes. Application of this amplifier in regenerative receiver requires a precise control of the linear term, i.e. the Q-factor of linear low-level signal operation. The proposed amplifier is realized using a modified active inductor circuit with compensation of resistive component in input admittance; this approach provides the required high value and good control of Q-factor. The simulations of amplifier selectivity characteristics are given for the design example using 130 nm CMOS technology.",

keywords = "Amplifier, CMOS, van der Pol",

author = "Oliveira, {Lu{\'i}s Augusto Bica Gomes de} and {DEE Group Author}",

year = "2011",

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doi = "10.1109/MWSCAS.2011.6026686",

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T1 - Regenerative Current Amplifier using van der Pol Approximation

AU - Oliveira, Luís Augusto Bica Gomes de

AU - DEE Group Author

PY - 2011/1/1

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N2 - When van der Pol oscillator linear damping parameter is positive then this oscillator becomes a nonlinear resonant amplifier of high sensitivity for small ac signals with the frequencies located in the vicinity of the oscillator natural frequency. The gain characteristic of this amplifier is similar to the gain characteristic of logarithmic amplifier; the sensitivity is high for small signals and, due to the nonlinear damping parameter, is reduced for the signals of higher amplitudes. Application of this amplifier in regenerative receiver requires a precise control of the linear term, i.e. the Q-factor of linear low-level signal operation. The proposed amplifier is realized using a modified active inductor circuit with compensation of resistive component in input admittance; this approach provides the required high value and good control of Q-factor. The simulations of amplifier selectivity characteristics are given for the design example using 130 nm CMOS technology.

AB - When van der Pol oscillator linear damping parameter is positive then this oscillator becomes a nonlinear resonant amplifier of high sensitivity for small ac signals with the frequencies located in the vicinity of the oscillator natural frequency. The gain characteristic of this amplifier is similar to the gain characteristic of logarithmic amplifier; the sensitivity is high for small signals and, due to the nonlinear damping parameter, is reduced for the signals of higher amplitudes. Application of this amplifier in regenerative receiver requires a precise control of the linear term, i.e. the Q-factor of linear low-level signal operation. The proposed amplifier is realized using a modified active inductor circuit with compensation of resistive component in input admittance; this approach provides the required high value and good control of Q-factor. The simulations of amplifier selectivity characteristics are given for the design example using 130 nm CMOS technology.

KW - Amplifier

KW - CMOS

KW - van der Pol

U2 - 10.1109/MWSCAS.2011.6026686

DO - 10.1109/MWSCAS.2011.6026686

M3 - Conference contribution

SN - 978-1-61284-856-3

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EP - 4

BT - Midwest Symposium on Circuits and Systems Conference Proceedings

Y2 - 1 January 2011

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