Ara es mostren els items 1-20 de 396

    • 5GHz CMOS all-pass filter-based true time delay cell 

      Aghazadeh Dafsari, Seyed Rasoul; Martínez García, Herminio; Saberkari, Alireza (Multidisciplinary Digital Publishing Institute (MDPI), 2020)
      Capítol de llibre
      Accés obert
      Analog CMOS time-delay cells realized by passive components, e.g., lumped LC delay lines, are inefficient in terms of area for multi-GHz frequencies. All-pass filters considered as active circuits can, therefore, be the ...
    • 5GHz CMOS all-pass filter-based true time delay cell 

      Aghazadeh Dafsari, Seyed Rasoul; Martínez García, Herminio; Saberkari, Alireza (2018-12-22)
      Article
      Accés obert
      Analog CMOS time-delay cells realized by passive components, e.g., lumped LC delay lines, are inefficient in terms of area for multi-GHz frequencies. All-pass filters considered as active circuits can, therefore, be the ...
    • 5GHz CMOS all–pass filter–based true time delay cell 

      Aghazadeh Dafsari, Seyed Rasoul; Martínez García, Herminio; Saberkari, Alireza (2018-12-22)
      Article
      Accés obert
      Analog CMOS time-delay cells realized by passive components, e.g., lumped LC delay lines, are inefficient in terms of area for multi-GHz frequencies. All-pass filters considered as active circuits can, therefore, be the ...
    • A 250-ps integrated ultra-wideband timed array beamforming receiver in 0.18 um CMOS 

      Aghazadeh Dafsari, Seyed Rasoul; Martínez García, Herminio; Aragonès Cervera, Xavier; Saberkari, Alireza (Institute of Electrical and Electronics Engineers (IEEE), 2020)
      Comunicació de congrés
      Accés obert
      This paper presents a 4-channel ultra-wideband (UWB) timed array beamforming receiver designed in a standard 0.18-um CMOS technology. The proposed timed array receiver achieves a maximum delay of 250 ps at the maximum beam ...
    • A 3–5-GHz, 385–540-ps CMOS true time delay element for ultra-wideband antenna arrays 

      Aghazadeh Dafsari, Seyed Rasoul; Martínez García, Herminio; Barajas Ojeda, Enrique; Saberkari, Alireza (Elsevier, 2022-05-01)
      Article
      Accés restringit per política de l'editorial
      This paper proposes an all-pass filter-based true time delay (TTD) element covering a 3–5-GHz ultra-wideband (UWB) frequency. The proposed TTD element designed in a standard 0.18-µm CMOS technology achieves a tunable delay ...
    • A comparative study of different optimization methods for resonance half-bridge converter 

      Salehi, Navid; Martínez García, Herminio; Velasco Quesada, Guillermo (2018-12-02)
      Article
      Accés obert
      The LLC resonance half-bridge converter is one of the most popular DC-DC converters and could easily inspire researchers to design a high-efficiency and high-power-density converter. LLC resonance converters have diverse ...
    • A comprehensive review of control strategies and optimization methods for individual and community microgrids 

      Salehi, Navid; Martínez García, Herminio; Velasco Quesada, Guillermo; Guerrero, Josep Maria (Institute of Electrical and Electronics Engineers (IEEE), 2022-01-13)
      Article
      Accés obert
      Community Microgrid offers effective energy harvesting from distributed energy resources and efficient energy consumption by employing an energy management system (EMS). Therefore, the collaborative microgrids are essentially ...
    • A contribution to students' assessment adjusts of multiple choice questionnaires with fuzzy logic 

      Domingo Peña, Joan; Martínez García, Herminio; García Vílchez, Encarnación (European Society for Engineering Education (SEFI), 2022)
      Text en actes de congrés
      Accés obert
      In University environment, it is common to use multiple-choice objective tests with three or four possible answers, of which only one is correct and the rest are erroneous. In this type of tests, usually the wrong answers ...
    • A contribution to students’ assessment adjusts of multiple choice questionnaires with fuzzy logic 

      Martínez García, Herminio; García Vílchez, Encarnación (Universitat Politècnica de Catalunya, 2022-09)
      Text en actes de congrés
      Accés obert
      In University environment, it is common to use multiple-choice objective tests with three or four possible answers, of which only one is correct and the rest are erroneous. In this type of tests, usually the wrong answers ...
    • A contribution to students’ assessment adjusts of multiple choice questionnaires with fuzzy logic 

      Domingo Peña, Joan; Martínez García, Herminio (Universitat Politècnica de Catalunya (UPC), 2022)
      Text en actes de congrés
      Accés obert
      In University environment, it is common to use multiple-choice objective tests with three or four possible answers, of which only one is correct and the rest are erroneous. In this type of tests, usually the wrong answers ...
    • A high step-up Z-source-flyback converter with integrated inductors for photovoltaic applications 

      Hamed, Moradmand Jazi; Davoodi, Bita; Soltani, Mohsen; Martínez García, Herminio; Velasco Quesada, Guillermo (2021-12-30)
      Article
      Accés obert
      Increasing the voltage gain by means of Z-source network will provide some features such as low voltage stress of semiconductor devices, low duty cycle of the switch and low reverse recovery problem of output diode that ...
    • A novel component sizing procedure in off-grid networked microgrids 

      Salehi, Navid; Martínez García, Herminio; Velasco Quesada, Guillermo (Institute of Electrical and Electronics Engineers (IEEE), 2021)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Stand-alone Microgrids (MGs) can effectively be utilized to provide the energy demand for different purposes, such as reducing the burden of the main grid. Paying attention to harvesting renewable energies in MGs resulted ...
    • A novel high step-up secondary side impedance source full-bridge converter 

      Salehi, Navid; Martínez García, Herminio; Velasco Quesada, Guillermo (International Centre for Numerical Methods in Engineering (CIMNE), 2018)
      Text en actes de congrés
      Accés obert
      In order to suppress the voltage stress of semiconductor devices, and solve the reverse recovery problem of diodes by decreasing the duty cycle of switches, impedance source converters could be consider as a solution. In ...
    • A PLL control for self-tuning of parallel wireless power transfer receivers utilizing switch-mode gyrator emulated inductors 

      Saad, M.A.; Martínez García, Herminio; Alarcón Cot, Eduardo José (2017)
      Comunicació de congrés
      Accés obert
      In multiple receivers wireless power transfer (WPT) systems, it is preferable to retune the resonant frequency of every receiver to the transmitter operating frequency in front of frequency mismatches. This paper discusses ...
    • Active inductor-based tunable impedance matching network for RF power amplifier application 

      Saberkari, Alireza; Ziabakhsh, Saman; Martínez García, Herminio; Alarcón Cot, Eduardo José (2015-08)
      Article
      Accés obert
      This paper presents the use of a new structure of active inductor named cascoded flipped-active inductor (CASFAI) in a T-type high-pass tunable output matching network of a class-E RF power amplifier (RFPA) to control the ...
    • Active inductor–based tunable impedance matching network for RF power amplifier application 

      Saberkari, Alireza; Ziabakhsh, Saman; Martínez García, Herminio; Alarcón Cot, Eduardo José (2016-01)
      Article
      Accés obert
    • Activities as a link element in the bachelor's degree in Industrial Electronics and Automation Engineering 

      Martínez García, Herminio; García Vílchez, Encarnación (European Society for Engineering Education (SEFI), 2022)
      Text en actes de congrés
      Accés obert
      This paper describes the experience carried out within the Bachelor's Degree in Industrial Electronics and Automation Engineering taught at the Eastern Barcelona School of Engineering (EEBE) of the Technical University of ...
    • An agile supply modulator with improved transient performance for power efficient linear amplifier employing envelope tracking techniques 

      Prakash, Suraj; Martínez García, Herminio; Naderi, Mohammad H.; Lee, Hoi; Silva Martinez, José (Institute of Electrical and Electronics Engineers (IEEE), 2019-08-09)
      Article
      Accés obert
      This article presents an agile supply modulator with optimal transient performance that includes improvement in rise time, overshoot and settling time for the envelope tracking supply in linear power amplifiers. For this ...
    • An approach to renewable energies courses for Energy Engineering students in the framework of the European Higher Education Area (EHEA) 

      Martínez García, Herminio; García Vílchez, Encarna (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Text en actes de congrés
      Accés obert
    • An efficient CMOS LDO-assisted DC/DC buck regulator 

      Shirmohammadli, V.; Saberkari, Alireza; Martínez García, Herminio; Alarcón Cot, Eduardo José (2016)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this paper, a new structure based on linear-assisted DC-DC buck converter principle is proposed. Using a segmented LDO regulator instead of the conventional linear one in the hybrid scheme, reduces the difference between ...