Search Results - "Vidkjaer, J."

Oscillator Phase Noise: A Geometrical Approach by Djurhuus, T., Krozer, V., Vidkjaer, J., Johansen, T.K.

“…We construct a coordinate-independent description of oscillator linear response through a decomposition scheme derived independently of any Floquet theoretic…”
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Analysis and design of wide-band SiGe HBT active mixers by Johansen, T.K., Vidkjaer, J., Krozer, V.

“…The frequency response of SiGe HBT active mixers based on the Gilbert cell topology is analyzed theoretically. The time-varying operation of the active mixer…”
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Nonlinear analysis of a cross-coupled quadrature harmonic oscillator by Djurhuus, T., Krozer, V., Vidkjaer, J., Johansen, T.K.

“…The dynamic equations governing the cross-coupled quadrature harmonic oscillator are derived assuming quasi-sinusoidal operation. This allows for an…”
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Instabilities in RF-power amplifiers caused by a self-oscillation in the transistor bias network by Vidkjaer, J.

“…This paper describes a self-oscillation in the bias network of an amplifier which is commonly used for the output stage in mobile transmitters. It is…”
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A computerized study of the class-C-biased RF-power amplifier by Vidkjaer, J.

“…Comparisons between experiments and simulations on a widely used output stage in mobile transmitters are made. It is demonstrated that the operation cycle in…”
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Large-Signal Modeling of High-Speed InP DHBTs using Electromagnetic Simulation Based De-embedding by Johansen, T.K., Krozer, V., Konczykowska, A., Riet, M., Vidkjaer, J.

“…We report on a consistent large-signal and small-signal modeling and parameter extraction method for high-speed InP DHBT valid to 110 GHz. Electromagnetic…”
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Ultra-wideband MMICs for remote sensing applications by Johansen, T.K., Vidkjaer, J., Krozer, V.

“…This paper presents an overview of the current activity at the Technical University of Denmark in the field of ultra-wideband monolithic microwave integrated…”
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Ultra-wideband monolithic microwave integrated circuit solutions in SiGe and GaAs technology by Krozer, V., Johansen, T.K., Djurhuus, T., Vidkjaer, J.

“…Ultra-widehand analog monolithic microwave integrated circuits for advanced RF front-ends are presented using SiGe and GaAs technology. We demonstrate the…”
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A describing function approach to bipolar RF-power amplifier simulation by Vidkjaer, J.

“…A method for fast and accurate computations of the primary performance parameters such as gain, efficiency, output power, and bandwidth in class-C biased…”
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POLARIS: ESA's airborne ice sounding radar front-end design, performance assessment and first results by Hernandez, C.C., Krozer, V., Vidkjaer, J., Dall, J.

“…This paper addresses the design, implementation and experimental performance assessment of the RF front-end of an airborne P-band ice sounding radar. The ice…”
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AM to PM noise conversion in a cross-coupled quadrature harmonic oscillator by Djurhuus, Torsten, Krozer, Viktor, Vidkjær, Jens, Johansen, Tom K.

“…We derive the dynamic equations governing the cross‐coupled quadrature oscillator, perturbed by noise, leading to an expression for the close‐in phase noise…”
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Suitability of GaN and LDMOS for 70-82% efficiency 120-200W HPA addressing spaceborne P-band radar applications by Le Gallou, N., Vidkjaer, J., Poivey, C.

“…This paper addresses the development of P-band (435 MHz) HPA based on different technologies (GaN HEMT, LDMOS FET) for future use in pace radar applications in…”
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Suitability of GaN and LDMOS for 70-82% efficiency 120-200W HPA addressing spaceborne P-band radar applications by Le Gallou, N., Vidkjaer, J., Poivey, C.

“…This paper addresses the development of P-band (435 MHz) HPA based on different technologies (GaN HEMT, LDMOS FET) for future use in pace radar applications in…”
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Trade-off between phase-noise and signal quadrature in unilaterally coupled oscillators by Djurhuus, T., Krozer, V., Vidkjar, J., Johansen, T.K.

“…We present a comprehensive nonlinear analysis of coupled oscillators and examine the trade-off between phase-noise of the oscillator and the quadrature…”
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Substrate effects in wideband SiGe HBT mixer circuits by Johansen, T.K., Krozer, V., Vidkjaer, J., Djurhuus, T.

“…In this paper, the influence from substrate effects on the performance of wideband SiGe HBT mixer circuits is investigated. Equivalent circuit models including…”
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Design and performance assessment of an airborne ice sounding radar front-end by Hernandez, C.C., Krozer, V., Vidkjaer, J., Dall, J.

“…The paper describes the design and experimental performance assessment of the RF front-end of an airborne P-band ice sounding radar. The ice sounder design…”
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Development of an airborne ice sounding radar front-end by Krozer, V., Hernandez, C.C., Vazquez Roy, J.L., Vidkjaer, J., Dall, J.

“…This paper describes the design of an airborne P-band ice sounding radar. The ice sounder design features a microstrip antenna array with a relative operating…”
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Wideband monolithic microwave integrated circuit frequency converters with GaAs mHEMT technology by Krozer, V., Johansen, T.K., Djurhuus, T., Vidkjaer, J.

“…We present monolithic microwave integrated circuit (MMIC) frequency converter, which can be used for up and down conversion, due to the large RF and IF port…”
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Ultra-broadband Nonlinear Microwave Monolithic Integrated Circuits in SiGe, GaAs and InP by Krozer, V., Johansen, T.K., Djurhuus, T., Chenhui Jiang, Vidkjaer, J.

“…Analog MMIC circuits with ultra-wideband operation are discussed in view of their frequency limitation and different circuit topologies. Results for designed…”
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Uncertainty estimation in SiGe HBT small-signal modeling by Masood, S.M., Johansen, T.K., Vidkjaer, J., Krozer, V.

“…An uncertainty estimation and sensitivity analysis is performed on multi-step de-embedding for SiGe HBT small-signal modeling. The uncertainty estimation in…”
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