ORCA
Online Research @ Cardiff

Browse by Current Cardiff authors

Number of items: 17.

Chen, Peng, Quaglia, Roberto, Lees, Jonathan, Merrick, Brian M., Alt, Alexander and Tasker, Paul J. 2020. Look-up table method for optimising coupling ratio in broadband sequential power amplifiers. IET Microwaves Antennas and Propagation 14 (13) , pp. 1626-1634. 10.1049/iet-map.2019.1102

Alt, Alexander, Villarruel-Parra, Alejandro, Chen, Peng, Alsahali, Sattam, Forsyth, Andrew, Tasker, Paul J. and Lees, Jonathan 2020. Characterising the baseband impedance of supply modulators using simple modulated signals. Presented at: 2020 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMiC), Cardiff, Wales, 16-17 July 2020. 2020 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMiC). IEEE, pp. 1-3. 10.1109/INMMiC46721.2020.9160186

Chen, Peng, Alt, Alexander, Moreno Rubio, Jorge, Alsahali, Sattam, Lees, Jonathan, Quaglia, Roberto, Casbon, Michael and Tasker, Paul J. 2020. Optimising linearity of envelope tracking power amplifier using baseband linearisation approach. Presented at: 2020 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMiC), Cardiff, Wales, 16-17 July 2020. 2020 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMiC). IEEE, pp. 1-3. 10.1109/INMMiC46721.2020.9160347

Chen, Peng, Quaglia, Roberto, Lees, Jonathan, Merrick, Brian M., Alt, Alexander and Tasker, Paul 2020. Efficiency enhancement of a broadband sequential power amplifier using envelope tracking. Presented at: 2020 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMiC), Cardiff, Wales, 16-17 July 2020. 2020 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMiC). IEEE, pp. 1-3. 10.1109/INMMiC46721.2020.9160332

Chen, P., Alsahali, S., Alt, A., Wang, G., Casbon, M. A., Lees, J. and Tasker, P. J. 2020. Flexible bandwidth reduction technique for envelope tracking using low-pass finite impulse response filters. Electronics Letters 56 (12) , pp. 586-589. 10.1049/el.2020.0194

Alsahali, S., Gecan, D., Alt, A., Chen, P., Woodington, S., Sheikh, A., Tasker, P. and Lees, J. 2020. Modulated rapid load pull system for the emulation of envelope tracking power amplifiers. Electronics Letters 56 (7) , pp. 325-328. 10.1049/el.2019.3896

Alsahali, Sattam, Alt, Alexander, Chen, Peng, Wang, Guofeng, Tasker, Paul and Lees, Jonathan 2019. Supply modulator ripple in envelope tracking systems - effects and countermeasures. Presented at: 49th European Microwave Conference (EuMC 2019), Paris, France, 01-03 October 2019. 2019 49th European Microwave Conference (EuMC). IEEE, pp. 710-713. 10.23919/EuMC.2019.8910890

Mokhti, Zulhazmi A., Lees, Jonathan, Cassan, Cedric, Alt, Alexander and Tasker, Paul J. 2019. The nonlinear drain-source capacitance effect on continuous-mode class-B/J power amplifiers. IEEE Transactions on Microwave Theory and Techniques 67 (7) , pp. 2741-2747. 10.1109/TMTT.2019.2918309

Alt, Alexander, Hirshy, Hassan, Jiang, Sheng, Lee, Kean Boon, Casbon, Michael, Chen, Peng, Houston, Peter, Tasker, Paul and Lees, Jonathan 2019. Analysis of gain variation with changing supply voltages in GaN HEMTs for envelope tracking power amplifiers. IEEE Transactions on Microwave Theory and Techniques 67 (7) , pp. 2495-2504. 10.1109/TMTT.2019.2916404

Alsahali, Sattam, Gecan, Dragan, Alt, Alexander, Wang, Guofeng, Syed Anera, Syed M. H., Chen, Peng, Woodington, Simon, Sheikh, Aamir, Tasker, Paul and Lees, Jonathan 2019. A novel modulated rapid load pull system with digital pre-distortion capabilities. Presented at: 2019 93rd ARFTG Microwave Measurement Conference (ARFTG), Boston, MA, USA, 7 June 2019. 10.1109/ARFTG.2019.8739220

Alt, Alexander, Chen, Peng, Alsahali, Sattam, Wang, Guofeng, Quaglia, Roberto, Tasker, Paul and Lees, Jonathan 2019. Impact of the input impedance on the linearity of supply modulated GaN HEMT power amplifiers. Presented at: European Microwave Week 2019 (EuMW2019), 29 September - 03 October 2019.

Alt, Alexander, Quaglia, Roberto, Chen, Peng, Alsahali, Sattam, Tasker, Paul and Lees, Jonathan 2019. Class B* - A new high efficiency RF DC/DC converter concept using second harmonic generation/injection. Presented at: WPTC 2018: IEEE MTT-S Wireless Power Transfer Conference, Montreal, Quebec, 3-7 June 2018. 2018 IEEE Wireless Power Transfer Conference (WPTC). IEEE, 10.1109/WPT.2018.8639317

Alt, Alexander, Quaglia, Roberto, Chen, Peng, Alsahali, Sattam, Tasker, Paul J. and Lees, Jonathan 2018. Analysis of highly efficient self-synchronous class-F microwave rectifiers using waveform engineering. Presented at: 48th European Microwave Conference (EuMC), Madrid, Spain, 23-27 Sep 2018. Proceedings of the 48th European Microwave Conference. Piscataway, NJ: IEEE, pp. 773-776. 10.23919/EuMC.2018.8541564

Chen, Peng, Alsahali, Sattam, Alt, Alexander, Lees, Jonathan and Tasker, Paul J. 2018. Behavioral modeling of GaN power amplifiers using long short-term memory networks. Presented at: International Workshop on Integrated Nonlinear Microwave and Millimetre-wave Circuits (INMMIC), Brive La Gaillarde, France, 5-6 Jul 2018. International Workshop on Integrated Nonlinear Microwave and Millimetre-wave Circuits (INMMIC). IEEE, 10.1109/INMMIC.2018.8429984

Alt, Alexander, Chen, Peng, Alsahali, Sattam, Quaglia, Roberto, Tasker, Paul and Lees, Jonathan 2018. Comparing FET technologies in terms of their suitability for broadband envelope tracking power amplifiers. Presented at: InMMIC, Brive La Gaillarde, 5-6 July 2018. -.

Alt, Alexander and Lees, Jonathan 2017. Improving efficiency, linearity and linearisability of an asymmetric doherty power amplifier by modulating the peaking amplifier’s supply voltage. Presented at: 20th EuMW 2017, Nuremberg, Germany, 8-13 October 2017. 2017 47th European Microwave Conference (EuMC). IEEE, pp. 464-467. 10.23919/EuMC.2017.8230890

Alt, Alexander, Schwerg, Nikolai, Wangler, Christian and Gruner, Daniel 2017. Concept for the implementation of very high directivity and decade bandwidth in compact microstrip directional couplers. Presented at: 2016 46th European Microwave Conference (EuMC), London, UK, 3-7 October 2017. 2016 46th European Microwave Conference (EuMC). IEEE, pp. 210-213. 10.1109/EuMC.2016.7824315

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