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Markus Mayer

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Papers by Markus Mayer

Research paper thumbnail of Large-signal characterization of microwave power devices

International Journal of RF and Microwave Computer-Aided Engineering, 2005

Research paper thumbnail of A measurement based gate current model for GaAs MESFET's and HEMT's including self-heating and impact ionization

2001 International Symposium on Electron Devices for Microwave and Optoelectronic Applications. EDMO 2001 (Cat. No.01TH8567), 2000

We present a new gate current model to improve the simulation accuracy of power MESFET and HEMT c... more We present a new gate current model to improve the simulation accuracy of power MESFET and HEMT characteristics. The model is designed to meet the demands of a circuit designer. By the use of a polynomial fit it predicts the gate current within the usual voltage range of an amplifier load line with the highest accuracy. In addition, this leads

Research paper thumbnail of Modeling, analysis and classification of a PA based on identified Volterra kernels

European Gallium Arsenide and Other Semiconductor Application Symposium Gaas 2005, Oct 1, 2005

This article presents the modeling of a microwave Power Amplifier (PA) in the almost linear and c... more This article presents the modeling of a microwave Power Amplifier (PA) in the almost linear and compression operation modes. An in-band quasi-white noise real-valued signal is used as input for the identification process to excite every possible source of nonlinearity. A segment of the input-output measurement data is processed to generate an initial Parallel Cascade Wiener Model (PCWM). The model is cross-validated with the entire measurement signal. The first order Volterra kernel is extracted in order to obtain an estimation of the amplifier's memory. A new model is generated and its Volterra kernels up to the second order are estimated to apply the Structural Classification Methods (SCM). The result of this process is a suitable block-structure for the final amplifier model. The optimized model is intended to be numerically robust having a high identification percentage based on a variance figure of merit. This resulting model can be used for simulation of linearization systems or even in further identification processes.

Research paper thumbnail of A novel low loss microwave multiplexer design based on directional filters

IEEE Radio and Wireless Symposium formerly, 2002

A novel design method for directional filters is presented which reduces transmission loss and in... more A novel design method for directional filters is presented which reduces transmission loss and insertion loss. The theoretical background of directional filters is given, the frequency characteristics and transmission loss are discussed and parameters responsible for the requirements of a low loss application are worked out. A 50 Ω multiplexer was built to act as a bandpass filter bank to

Research paper thumbnail of The XML file format as a general solution for measurement data storage and exchange

2007 69th ARFTG Conference, 2007

Research paper thumbnail of A broadband active harmonic load-pull setup with a modulated generator as active load

Microwave, European Conference, 2004

ABSTRACT First Page of the Article

Research paper thumbnail of A time-domain large-signal measurement setup

International Journal of RF and Microwave Computer-Aided Engineering, 2005

ABSTRACT An active harmonic load-pull setup with the possibility to measure the inner voltages an... more ABSTRACT An active harmonic load-pull setup with the possibility to measure the inner voltages and currents is presented. To overcome stability issues, the realized setup uses open loops with synchronized generators for the 2nd and 3rd harmonic. Application examples show transistor-model verification and influences between harmonic matches. © 2004 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2005.

Research paper thumbnail of Large-signal characterization of microwave power devices

International Journal of RF and Microwave Computer-Aided Engineering, 2005

This paper presents an overview of nonlinear measurement techniques of microwave power devices an... more This paper presents an overview of nonlinear measurement techniques of microwave power devices and amplifiers. Several useful measurement techniques of nonlinear components available in Europe are described. Trends, especially in the area of high power and time domain measurements, are discussed. Finally, a summary of the TARGET measurement related tasks is proposed, in order to show how TARGET can improve the European capabilities in terms of nonlinear measurements.

Research paper thumbnail of Large-signal characterization of microwave power devices

International Journal of RF and Microwave Computer-Aided Engineering, 2005

Research paper thumbnail of A measurement based gate current model for GaAs MESFET's and HEMT's including self-heating and impact ionization

2001 International Symposium on Electron Devices for Microwave and Optoelectronic Applications. EDMO 2001 (Cat. No.01TH8567), 2000

We present a new gate current model to improve the simulation accuracy of power MESFET and HEMT c... more We present a new gate current model to improve the simulation accuracy of power MESFET and HEMT characteristics. The model is designed to meet the demands of a circuit designer. By the use of a polynomial fit it predicts the gate current within the usual voltage range of an amplifier load line with the highest accuracy. In addition, this leads

Research paper thumbnail of Modeling, analysis and classification of a PA based on identified Volterra kernels

European Gallium Arsenide and Other Semiconductor Application Symposium Gaas 2005, Oct 1, 2005

This article presents the modeling of a microwave Power Amplifier (PA) in the almost linear and c... more This article presents the modeling of a microwave Power Amplifier (PA) in the almost linear and compression operation modes. An in-band quasi-white noise real-valued signal is used as input for the identification process to excite every possible source of nonlinearity. A segment of the input-output measurement data is processed to generate an initial Parallel Cascade Wiener Model (PCWM). The model is cross-validated with the entire measurement signal. The first order Volterra kernel is extracted in order to obtain an estimation of the amplifier's memory. A new model is generated and its Volterra kernels up to the second order are estimated to apply the Structural Classification Methods (SCM). The result of this process is a suitable block-structure for the final amplifier model. The optimized model is intended to be numerically robust having a high identification percentage based on a variance figure of merit. This resulting model can be used for simulation of linearization systems or even in further identification processes.

Research paper thumbnail of A novel low loss microwave multiplexer design based on directional filters

IEEE Radio and Wireless Symposium formerly, 2002

A novel design method for directional filters is presented which reduces transmission loss and in... more A novel design method for directional filters is presented which reduces transmission loss and insertion loss. The theoretical background of directional filters is given, the frequency characteristics and transmission loss are discussed and parameters responsible for the requirements of a low loss application are worked out. A 50 Ω multiplexer was built to act as a bandpass filter bank to

Research paper thumbnail of The XML file format as a general solution for measurement data storage and exchange

2007 69th ARFTG Conference, 2007

Research paper thumbnail of A broadband active harmonic load-pull setup with a modulated generator as active load

Microwave, European Conference, 2004

ABSTRACT First Page of the Article

Research paper thumbnail of A time-domain large-signal measurement setup

International Journal of RF and Microwave Computer-Aided Engineering, 2005

ABSTRACT An active harmonic load-pull setup with the possibility to measure the inner voltages an... more ABSTRACT An active harmonic load-pull setup with the possibility to measure the inner voltages and currents is presented. To overcome stability issues, the realized setup uses open loops with synchronized generators for the 2nd and 3rd harmonic. Application examples show transistor-model verification and influences between harmonic matches. © 2004 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2005.

Research paper thumbnail of Large-signal characterization of microwave power devices

International Journal of RF and Microwave Computer-Aided Engineering, 2005

This paper presents an overview of nonlinear measurement techniques of microwave power devices an... more This paper presents an overview of nonlinear measurement techniques of microwave power devices and amplifiers. Several useful measurement techniques of nonlinear components available in Europe are described. Trends, especially in the area of high power and time domain measurements, are discussed. Finally, a summary of the TARGET measurement related tasks is proposed, in order to show how TARGET can improve the European capabilities in terms of nonlinear measurements.

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