- document
-
de Kok, M. (author), Monni S., (author), van Heijningen, M. (author), Garufo, A. (author), Smolders, B.A. (author), Johannsen, U. (author)This article reviews the current state-of-the-art of active-integrated antennas co-designed with power amplifiers (PAs). Three strategies to improve output power and power-added efficiency are described using examples, namely direct matching between PA and antenna, tuning of harmonic reflections in the antenna, and in-antenna power combining...conference paper 2022
- document
-
van der Bent, G. (author), de Hek, A.P. (author), Knight, R.J. (author), van Vliet, F.E. (author)In this article the feasibility and benefits of tacked-FET structures in a state-of-art GaN technology are investigated. Trade-offs between output power, efficiency and stability are made to yield stable, high performance devices. The results of three S-band GaN stacked-FET structures in the UMS GH25-10 technology are given. These structures are...conference paper 2022
- document
-
Donnot, A. (author), Edmunds, J. (author), Hammond, N. (author), Welch, M. (author), Kean, P. (author), Kehayas, E. (author), Hagen, R.A.J. (author), Yadav, S. (author), Medenblik, H.J.W. (author), Cheng, L.K. (author), Bulgarini, G. (author), Dresscher, M. (author)The High Photon Efficiency (HPE) standard is a promising approach for, low Size, Weight and Power (SWaP) optical terminal for space communications. In this paper, we report the creation of a breadboard demonstrator CCSDS compliant HPE source, capable of a Pulse Position Modulation (PPM) order of 256 with an average power of 4W and kW level peak...conference paper 2022
- document
-
de Hek, A.P. (author), van de Bent, G. (author), van Vliet, F.E. (author)A state-of-the-art, second harmonically tuned, 400 W S-band MMIC power amplifier has been developed. This amplifier delivers in the 2.8 – 3.3 GHz band an output power of 400 W and a PAE between 50-55%. The obtained amplifier performance is the result of the structured design approach discussed in this paper.conference paper 2022
- document
-
Essing, J.A.J. (author), Bossuet, A. (author), Knight, R.J. (author), de Hek, A.P. (author), van Vliet, F.E. (author)This paper describes an integrated S-band phaseshifter driver-amplifier to drive Gallium-Nitride (GaN) based power amplifiers in a phased-array radar transmit chain. This phase driver is implemented in a 0.25μm SiGe BiCMOS process and packaged into a QFN5x5. By using device stacking, the phase driver achieves an output power of more than 32.5dBm...conference paper 2021
- document
-
Atanasov, A.N. (author), Ahmad, W.H.R.A.M. (author), Alink, M.S.O. (author), van Vliet, F.E. (author)We propose a fast and simple method to accurately determine the compressing stage in a two-stage amplifier system based on reverse intermodulation and hot S-parameter measurements. The method uses no specialized hardware and needs little reconfiguration, simplifying the measurements. We demonstrate its validity over a broad range of amplifiers...conference paper 2021
- document
- Tajdari, F. (author), Berkhoff, A.P. (author), van der Zee, R.A.R. (author), de Boer, A. (author) article 2020
- document
-
van der Bent, G. (author), de Hek, A.P. (author), van Vliet, F.E. (author)The manufacturing of radar front-ends is preferably performed with components that are fully tested and known to be functional. This decreases the chances of instant failure or rapid degradation of the system. Complete testing of the RF-performance of the individual MMICs, however, is not always possible due to technical, infrastructural or...conference paper 2019
- document
-
van der Bent, G. (author), de Hek, A.P. (author), van Vliet, F.E. (author)The manufacturing of radar front-ends is preferably performed with components that are fully tested and known to be functional. This decreases the chances of instant failure or rapid degradation of the system. Complete testing of the RF-performance of the individual MMICs, however, is not always possible due to technical, infrastructural or...conference paper 2019
- document
-
van der Bent, G. (author), de Hek, P. (author), van Vliet, F.E. (author)The application of stacked-FETs in power ampli fiers allows for a supply voltage higher than supported by the breakdown voltage of a single transistor. Potential benefits of the increased supply voltage are reduced supply currents and a lower matching ratio at the output of the amplifier. Furthermore, an increased output power per chip area is...article 2019
- document
-
Tajdari, F. (author), Berkhoff, A.P. (author), de Boer, A. (author)This paper studies an acoustic source with a relatively small thickness and high bending stiffness. Piezoelectric actuators are used to drive the moving component of the acoustic source. In the current study, a lumped model is used to represent the acoustic source that is excited by a piezoelectric stacked actuator. The equivalent electrical...conference paper 2018
- document
-
van der Bent, G. (author), de Hek, A.P. (author), van Vliet, F.E. (author)A small-signal model of a Gallium Nitride (GaN) Field Effect Transistor (FET) is created which consists of a compact linear model of the intrinsic gate fingers and an Electro-Magnetic (EM)-based model of the extrinsic part. Accurate scaling of transistor size is obtained which means that larger transistors than supported by standard (foundry)...conference paper 2018
- document
-
Papadopoulos, N. (author), Steudel, S. (author), de Roose, F. (author), Eigabry, D.M. (author), Kronemeijer, A.J. (author), Genoe, J. (author), Dehaene, W. (author), Myny, K. (author)In this paper a charge sense amplifier (CSA) using a 5μm In-Ga-Zn-O transistor technology on 15μm thick flexible substrate is presented for readout of a 500dpi fingerprint sensor array targeting direct integration with active matrix organic light emitting displays (AMOLED). The CSA achieves a linear input range of 0.8V for rail to rail output at...conference paper 2018
- document
-
Papadopoulos, N. (author), Steudel, S. (author), de Roose, F. (author), Eigabry, D.M. (author), Kronemeijer, A.J. (author), Genoe, J. (author), Dehaene, W. (author), Myny, K. (author)In this paper a charge sense amplifier (CSA) using a 5μm In-Ga-Zn-O transistor technology on 15μm thick flexible substrate is presented for readout of a 500dpi fingerprint sensor array targeting direct integration with active matrix organic light emitting displays (AMOLED). The CSA achieves a linear input range of 0.8V for rail to rail output at...conference paper 2018
- document
-
Bultink, C.C. (author), Tarasinski, B. (author), Haandbæk, N. (author), Poletto, S. (author), Haider, N. (author), Michalak, D.J. (author), Bruno, A. (author), DiCarlo, L. (author)We present and demonstrate a general three-step method for extracting the quantum efficiency of dispersive qubit readout in circuit QED. We use active depletion of post-measurement photons and optimal integration weight functions on two quadratures to maximize the signal-to-noise ratio of the non-steady-state homodyne measurement. We derive...article 2018
- document
-
van Heijningen, M. (author), de Hek, A.P. (author), Dourlens, C. (author), Fellon, P. (author), Adamiuk, G. (author), Ayllon, N. (author), van Vliet, F.E. (author)This paper presents the design and measurement results of a single-chip front-end monolithic microwave integrated circuit (MMIC), incorporating a high-power amplifier, transmit– receive switch, low-noise amplifier, and calibration coupler,realized in 0.25 μm AlGaN/GaN-on-SiC MMIC technology of UMS (GH25-10). The MMIC is operating in C-band (5.2...article 2017
- document
- van der Bent, G. (author), de Hek, A.P. (author), van Vliet, F.E. (author) conference paper 2016
- document
-
Tajdari, F. (author), Berkhoff, A.P. (author), de Boer, A. (author)The present work describes the electrical, mechanical and acoustical behavior of a thin honey-comb structure as an acoustic source. The acoustic source has to operate in the low frequency, quasi-static regime and is driven by a piezoelectric stack actuator. In addition, a two-way energy flow between the actuator and a connected amplifier is...conference paper 2016
- document
-
Firrao, E.L. (author), Annema, A.J. (author), van Vliet, F.E. (author), Nauta, B. (author)The impedance of an antenna changes heavily with changing EM environments, while RF power amplifiers (PAs) are optimized for driving a well-defined load impedance. As a solution, switchable matching networks are used in automatic antenna tuners to match the antenna impedance to (about) the desired PA load impedance. This paper presents a...article 2015
- document
-
van Vliet, F.E. (author), de Hek, P. (author)In this overview paper, a summary of the European academic and industrial status on RF GaN is given. The roles of EDA and ESA are highlighted, and examples of on-going research activities are presented. A set of HPAs over frequency, representative of today's European status, is discussed. © 2015 IEEE.conference paper 2015