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Alavi, S.M. (author), Staszewski, R.B. (author), De Vreede, L.C.N. (author), Long, J.R. (author)
This paper presents a wideband 2 13-bit in-phase/quadrature-phase (I/Q) RF digital-to-analog converter-based all-digital modulator realized in 65-nm CMOS. The isolation between I and Q paths is guaranteed employing 25% duty-cycle differential quadrature clocks. With a 1.3-V supply and an on-chip power combiner, the digital I/Q transmitter...
journal article 2014
document
Hajian, M. (author), Kuijpers, B. (author), Buisman, K. (author), Akhnoukh, A. (author), Pelk, M. (author), De Vreede, L.C.N. (author), Zijdeveld, J. (author), Ligthart, L.P. (author), Spitas, C. (author)
The design concept of passive and active reconfigurable reflectarray antennas has been proposed and tested. The antenna elements in the array are identical hollowed patches. In the first phase of study the slots are loaded with a SMD capacitor to set the required phase shift needed for array implementation. Simulations show promising results....
journal article 2012
document
Kolfschoten, G.L. (author), De Vreede, G.J. (author), Pietron, L.R. (author)
This paper presents a training approach to support the deployment of collaboration process support according to the Collaboration Engineering approach. In Collaboration Engineering, practitioners in an organization are trained to facilitate a specific collaborative work practice on a recurring basis. To transfer the complex skill set of a...
journal article 2011
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Staszewski, R.B. (author), De Vreede, L.C.N. (author)
patent 2011
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Marchetti, M. (author), Pelk, M.J. (author), De Vreede, L.C.N. (author)
Measurement arrangement and method for active load pull measurements of a device under test (1). A wideband analog-to-digital conversion block (3) is provided for obtaining measurement data. First and second injection signal generators (7, 8) are connected to a source side and a load side of the device under test (1). This set up allows to...
patent 2009
document
Kolfschoten, G.L. (author), Seck, M. (author), De Vreede, G.J. (author)
Modeling is a key activity in system analysis and design. Users as well as stakeholders, experts and entrepreneurs need to be able to create shared understanding about a system representation in various phases of a design process. In each of these phases it is important to align views and ensure that differences in understanding of the system...
journal article 2009
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Nanver, L.K. (author), Schellevis, H. (author), Scholtes, T.L.M. (author), La Spina, L. (author), Lorito, G. (author), Sarubbi, F. (author), Gonda, V. (author), Popadic, M. (author), Buisman, K. (author), De Vreede, L.C.N. (author)
This paper reviews special RF/microwave silicon device implementations in a process that allows two-sided contacting of the devices: the back-wafer contacted silicon-on-glass (SOG) substrate-transfer technology (STT) developed at DIMES. In this technology, metal transmission lines can be placed on the low-loss glass substrate, while the...
journal article 2009
document
Qureshi, J.H. (author), Pelk, M.J. (author), Marchetti, M. (author), Neo, W.C.E. (author), Gajadharsing, J.R. (author), Van der Heijden, M.P. (author), De Vreede, L.C.N. (author)
A 90-W peak-power 2.14-GHz improved GaN outphasing amplifier with 50.5% average efficiency for wideband code division multiple access (W-CDMA) signals is presented. Independent control of the branch amplifiers by two in-phase/quadrature modulators enables optimum outphasing and input power leveling, yielding significant improvements in gain,...
journal article 2009
document
Kolfschoten, G.L. (author), De Vreede, G.J. (author)
Collaboration Engineering is an approach for the design and deployment of repeatable collaboration processes that can be executed by practitioners without the support of collaboration professionals such as facilitators. A critical challenge in Collaboration Engineering concerns how the design activities have to be executed and which design...
journal article 2009
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Marchetti, M. (author), Pelk, M.J. (author), Buisman, K. (author), Neo, W.C.E. (author), Spirito, M. (author), De Vreede, L.C.N. (author)
A new wideband open-loop active harmonic load–pull measurement approach is presented. The proposed method is based on wideband data-acquisition and wideband signal-injection of the incident and device generated power waves at the frequencies of interest. The system provides full, user defined, in-band control of the source and load reflection...
journal article 2008
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Huang, C. (author), Buisman, K. (author), Nanver, L.K. (author), Sarubbi, F. (author), Popadic, M. (author), Scholtes, T.L.M. (author), Schellevis, H. (author), Larson, L.E. (author), De Vreede, L.C.N. (author)
journal article 2008
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Pelk, M.J. (author), Neo, W.C.E. (author), Gajadharsing, J.R. (author), Pengelly, R.S. (author), De Vreede, L.C.N. (author)
A three-way Doherty 100-W GaN base-station power amplifier at 2.14 GHz is presented. Simple, but accurate design equations for the output power combiner of the amplifier are introduced. Mixed-signal techniques are utilized for uncompromised control of the amplifier stages to optimize efficiency, as well as linearity. The combination of the above...
journal article 2008
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Huang, C. (author), De Vreede, L.C.N. (author), Sarubbi, F. (author), Popadic, M. (author), Buisman, K. (author), Qureshi, J. (author), Marchetti, M. (author), Akhnoukh, A. (author), Scholtes, T.L.M. (author), Larson, L.E. (author), Nanver, L.K. (author)
journal article 2008
document
De Vreede, L.C.N. (author)
Varactor element (Dl; D2) having a junction region, in which the depletion capacitance of the varactor element varies when a reverse bias voltage is applied to the varactor element. The varactor element (Dl; D2) has an exponential depletion capacitance- voltage relation, e.g. obtained by providing a predetermined doping profile in the junction...
patent 2007
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Kolfschoten, G.L. (author), Den Hengst-Bruggeling, M. (author), De Vreede, G.J. (author)
journal article 2007
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Larson, L.E. (author), De Vreede, L.C.N. (author)
An integrated variable voltage diode capacitor topology applied to a circuit providing a variable voltage load for controlling variable capacitance. The topology includes a first pair of anti-series varactor diodes, wherein the diode power-law exponent n for the first pair of anti-series varactor diodes in the circuit is equal or greater than 0...
patent 2006
document
Kolfschoten, G.L. (author), Briggs, R.O. (author), De Vreede, G.J. (author), Jacobs, P.H.M. (author), Appelman, J.H. (author)
Organizations increasingly use collaborative teams in order to create value for their stakeholders. This trend has given rise to a new research field: Collaboration Engineering. The goal of Collaboration Engineering is to design and deploy processes for high-value recurring collaborative tasks, and to design these processes such that...
journal article 2006
document
De Vreede, L. (author), Pelk, M.J. (author)
Loss-compensating circuit for use when analysing electrical properties, such as largesignal properties, of an electronic device to be tested (1) by means of an impedance tuner (6; 7). The loss-compensating circuit (15) comprises two symmetrically positioned negative impedance elements (26, 27) separated by a phase shift network (17; 28; 30). By...
patent 2004
document
Van Mullem, C. (author), Janssen, W.J.G.D. (author), De Vreede, J.P.M. (author)
journal article 1997
document
De Vreede, L.C.N. (author)
Abstract not available
doctoral thesis 1996
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