Enviaments recents

  • Performance modeling and shaping function extraction for Dual-input load modulated power amplifiers 

    Li, Wantao; Bogusz, Aleksander; Lees, Jonathan; Quaglia, Roberto; Cripps, Steve C.; Montoro López, Gabriel; Gilabert Pinal, Pere Lluís
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    This paper proposes the method of extracting a shaping function for operating a family of Dual Input Power Amplifiers operating with modulated signals such as OFDM-based 5G new radio (NR) signals. The shaping function ...
  • Design and implementation of a GPU-Based digital predistortion linearizer for RF power amplifiers 

    Li, Wantao; Montoro López, Gabriel; Gilabert Pinal, Pere Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2023)
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    This paper presents an automated process for generating computationally efficient radiofrequency (RF) power amplifier (PA) behavioural models that can be used for digital-predistortion (DPD) linearization. The implementation ...
  • Digital control and predistortion linearization of Dual-input load modulated power amplifiers 

    Li, Wantao; Thompson, William; Montoro López, Gabriel; Cope, Mark; BenArfi, Anis; Outaleb, Noureddine; Chuang, Kevin; Gilabert Pinal, Pere Lluís (European Space Agency (ESA), 2023)
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    In a satellite communication system, due to the limited amount of energy that can be obtained through photovoltaic cells, there are some constraints on the downlink capabilities, especially for small satellites. A typical ...
  • Digital shaping and linearization of a dual-input load-modulated balanced amplifier 

    Li, Wantao; Montoro López, Gabriel; Thompson, William; Chuang, Kevin; Gilabert Pinal, Pere Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2023)
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    This paper presents shaping and linearization techniques to trade-off linearity and power efficiency in a dual-input pseudo-Doherty load-modulated balanced amplifier (PD-LMBA). The proposed shaping function is defined to ...
  • Incremental DPD linearization for mobile terminals with non-flat frequency response in dynamic bandwidth Re-allocation scenarios 

    Li, Wantao; Guo, Yan; Montoro López, Gabriel; Gilabert Pinal, Pere Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2023)
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    This paper presents a low-complexity open-loop digital linearization system for handset applications with non-flat frequency response when considering a 5G new radio dynamic bandwidth re-allocation scenario. The proposed ...
  • Frequency-Dependent DPD linearization for load-mismatched mobile terminal PAs operating under dynamic resource block allocation 

    Li, Wantao; Montoro López, Gabriel; Guo, Yan; Gilabert Pinal, Pere Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2023)
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    This paper presents a novel linearization method to compensate for load-mismatched power amplifiers in 5G new radio mobile terminals. The proposed digital predistortion (DPD) approach is based on a frequency-dependent ...
  • Slow-envelope shaping function FPGA implementation for 5G NR envelope tracking PA 

    Li, Wantao; Bartzoudis, Nikolaos; Rubio Fernández, José; López Bueno, David; Montoro López, Gabriel; Gilabert Pinal, Pere Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2022)
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    This paper focuses on the FPGA implementation of a slew-rate reduction (SR) shaping function for envelope tracking (ET) power amplifiers (PAs). The SR envelope has been proved effective to trade-off power efficiency and ...
  • Fast modeling of lateral modes in BAW resonators with arbitrary in-plane geometry 

    Udaondo Guerrero, Carlos; Collado Gómez, Juan Carlos; Mateu Llevadot, Jordi (Institute of Electrical and Electronics Engineers (IEEE), 2022)
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    The Transmission Line Matrix (TLM) method is used to model and predict lateral spurious resonances in a BAW resonator. The dispersive characteristics of the main propagating mode, which are defined by the stack of materials, ...
  • Application of the input-output equivalent sources method for the simulation of nonlinearities in TC-SAW resonators and filters 

    González Rodríguez, Marta; Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; González Arbesú, José María; Huebner, Sebatian; Aigner, Robert (Institute of Electrical and Electronics Engineers (IEEE), 2022)
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    A good understanding of the nonlinearity mechanism in SAW devices is a crucial aspect in the filter stage. Nonlinear intermodulation distortion (IMD) may lead to spurious signals falling into the receiver band and limiting ...
  • Updated BVD modeling of AlN-based solidly mounted resonators working at cryogenic and high temperatures: from -160°C up to 130°C 

    Lugo Hernández, Eduardo; Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; Carmona Cejas, José Manuel; Mirea, Teona; Olivares Roza, Jimena (Institute of Electrical and Electronics Engineers (IEEE), 2022)
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    In this work we theoretically and experimentally assess the behavior of AlN-based Solidly Mounted Resonators (SMR) at cryogenic and high temperatures. This study can be useful for precise behavior prediction of SMR sensors ...
  • RF leakage compensation in wideband envelope tracking power amplifiers for mobile terminals 

    Li, Wantao; Montoro López, Gabriel; Gilabert Pinal, Pere Lluís (2022)
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    This paper presents a new linearization method to compensate for the unwanted RF leakage that appears at the ouput of envelope tracking modulators (ETMs) when operating envelope tracking (ET) power amplifiers (PAs) with ...
  • Method to measure reflection coefficient under CW high-power signals in SAW resonators 

    González Rodríguez, Marta; Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; González Arbesú, José María; Huebner, Sebatian; Aigner, Robert (Institute of Electrical and Electronics Engineers (IEEE), 2021)
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    Improving power handling and lifetime are key assets to ensure device performance and reliability. SAW resonators composed by very thin cross-section inter-digital transducer (IDT) structures make difficult to control the ...

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