Freguency-domain analysis of nonlinear microwave circuits

Dissertation

Tapani Närhi

Research output: ThesisDissertationMonograph

Abstract

A frequency-domain method is presented for the numerical steady-state analysis of nonlinear microwave circuits. Nonlinear elements are described with Chebyshev expansions or rational functions of Chebyshev expansions and their response is calculated directly in the frequency domain. Since no time-to-frequency conversions are needed, the method is especially suitable for multi-tone problems which are difficult to solve with harmonic-balance methods. Numerically stable recursive procedures allow the use of high-degree expansions for strongly nonlinear devices. The analysis method is coupled with a new measurement-based modelling approach, where the frequency-domain large-signal model is directly constructed through integration from the measured small-signal y-parameters. The resulting model is inherently consistent and allows an accurate representation of the frequency-dependent characteristics of nonlinear devices. The analysis method and modelling approach are experimentally verified by two- and three-tone measurements on a MESFET mixer.
Original languageEnglish
QualificationDoctor Degree
Awarding Institution
  • Helsinki University of Technology
Award date9 Jul 1993
Place of PublicationEspoo
Publisher
Print ISBNs951-38-4386-6
Publication statusPublished - 1993
MoE publication typeG4 Doctoral dissertation (monograph)

Fingerprint

microwave circuits
expansion
rational functions
frequency converters
field effect transistors
harmonics

Keywords

  • telecommunications
  • microwave devices
  • nonlinear systems
  • numerical analysis

Cite this

Närhi, T. (1993). Freguency-domain analysis of nonlinear microwave circuits: Dissertation. Espoo: VTT Technical Research Centre of Finland.
Närhi, Tapani. / Freguency-domain analysis of nonlinear microwave circuits : Dissertation. Espoo : VTT Technical Research Centre of Finland, 1993. 150 p.
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abstract = "A frequency-domain method is presented for the numerical steady-state analysis of nonlinear microwave circuits. Nonlinear elements are described with Chebyshev expansions or rational functions of Chebyshev expansions and their response is calculated directly in the frequency domain. Since no time-to-frequency conversions are needed, the method is especially suitable for multi-tone problems which are difficult to solve with harmonic-balance methods. Numerically stable recursive procedures allow the use of high-degree expansions for strongly nonlinear devices. The analysis method is coupled with a new measurement-based modelling approach, where the frequency-domain large-signal model is directly constructed through integration from the measured small-signal y-parameters. The resulting model is inherently consistent and allows an accurate representation of the frequency-dependent characteristics of nonlinear devices. The analysis method and modelling approach are experimentally verified by two- and three-tone measurements on a MESFET mixer.",
keywords = "telecommunications, microwave devices, nonlinear systems, numerical analysis",
author = "Tapani N{\"a}rhi",
year = "1993",
language = "English",
isbn = "951-38-4386-6",
series = "VTT Publications",
publisher = "VTT Technical Research Centre of Finland",
number = "148",
address = "Finland",
school = "Helsinki University of Technology",

}

Närhi, T 1993, 'Freguency-domain analysis of nonlinear microwave circuits: Dissertation', Doctor Degree, Helsinki University of Technology, Espoo.

Freguency-domain analysis of nonlinear microwave circuits : Dissertation. / Närhi, Tapani.

Espoo : VTT Technical Research Centre of Finland, 1993. 150 p.

Research output: ThesisDissertationMonograph

TY - THES

T1 - Freguency-domain analysis of nonlinear microwave circuits

T2 - Dissertation

AU - Närhi, Tapani

PY - 1993

Y1 - 1993

N2 - A frequency-domain method is presented for the numerical steady-state analysis of nonlinear microwave circuits. Nonlinear elements are described with Chebyshev expansions or rational functions of Chebyshev expansions and their response is calculated directly in the frequency domain. Since no time-to-frequency conversions are needed, the method is especially suitable for multi-tone problems which are difficult to solve with harmonic-balance methods. Numerically stable recursive procedures allow the use of high-degree expansions for strongly nonlinear devices. The analysis method is coupled with a new measurement-based modelling approach, where the frequency-domain large-signal model is directly constructed through integration from the measured small-signal y-parameters. The resulting model is inherently consistent and allows an accurate representation of the frequency-dependent characteristics of nonlinear devices. The analysis method and modelling approach are experimentally verified by two- and three-tone measurements on a MESFET mixer.

AB - A frequency-domain method is presented for the numerical steady-state analysis of nonlinear microwave circuits. Nonlinear elements are described with Chebyshev expansions or rational functions of Chebyshev expansions and their response is calculated directly in the frequency domain. Since no time-to-frequency conversions are needed, the method is especially suitable for multi-tone problems which are difficult to solve with harmonic-balance methods. Numerically stable recursive procedures allow the use of high-degree expansions for strongly nonlinear devices. The analysis method is coupled with a new measurement-based modelling approach, where the frequency-domain large-signal model is directly constructed through integration from the measured small-signal y-parameters. The resulting model is inherently consistent and allows an accurate representation of the frequency-dependent characteristics of nonlinear devices. The analysis method and modelling approach are experimentally verified by two- and three-tone measurements on a MESFET mixer.

KW - telecommunications

KW - microwave devices

KW - nonlinear systems

KW - numerical analysis

M3 - Dissertation

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Närhi T. Freguency-domain analysis of nonlinear microwave circuits: Dissertation. Espoo: VTT Technical Research Centre of Finland, 1993. 150 p.