Now showing items 1-18 of 18

    • A 1.2-V current-mode RMS-to-DC converter based on a novel two-quadrant electronically simulated MOS translinear loop 

      Martincorena Arraiza, Maite; Cruz Blas, Carlos Aristóteles de la Upna; Algueta-Miguel, Jose M. Upna; López Martín, Antonio Upna (IEEE, 2020)   Artículo / Artikulua  OpenAccess
      A novel current-mode CMOS RMS-to-DC converter using translinear techniques is introduced. It is based on a squarer/divider cell that is implemented using an electronically simulated loop with a novel biasing scheme that ...
    • Characterization of wireless propagation in complex indoor environments 

      Azpilicueta Fernández de las Heras, Leyre Upna (2015)   Tesis doctoral / Doktoretza tesia  OpenAccess
      En este trabajo de investigación se ha propuesto un nuevo modelo de propagación determinista para analizar la propagación radioeléctrica en entornos complejos. En primer lugar, se ha realizado un profundo análisis de los ...
    • Design of low-cost smart accelerometers 

      Carlosena García, Alfonso Upna; López Martín, Antonio Upna; Massarotto, Marco Upna; Cruz Blas, Carlos Aristóteles de la Upna; Lecumberri Villamediana, Pablo Upna; Gómez Fernández, Marisol Upna; Pintor Borobia, Jesús María Upna; Gárriz Sanz, Sergio Upna (Universitat Politècnica de Catalunya, 2005)   Artículo / Artikulua  OpenAccess
      The goal of this project is to design a low-cost smart accelerometer, making use of a piezoelectric element as basic sensing material, and adding a mixed-mode conditioning circuit.
    • Design of MOS-translinear multiplier/dividers in analog VLSI 

      López Martín, Antonio Upna; Carlosena García, Alfonso Upna (Hindawi Publishing Corporation, 2000)   Artículo / Artikulua  OpenAccess
      A general framework for designing current-mode CMOS analog multiplier/divider circuits based on the cascade connection of a geometric-mean circuit and a squarer/ divider is presented. It is shown how both building blocks ...
    • Energy harvesting approaches in IoT scenarios with very low ambient energy 

      López Martín, Antonio Upna; Algueta-Miguel, Jose M. Upna; Matías Maestro, Ignacio Upna (European Association for the Development of Renewable Energy, Environment and Power Quality (EA4EPQ), 2019)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      The feasibility of multi-source energy harvesting in Internet of Things (IoT) scenarios with low and intermittent ambient energy is addressed. As a relevant case study, application to a smart cargo container system is ...
    • Folded Cascode OTA with 5540 MHzpF/mA FoM 

      Garde Luque, María Pilar Upna; López Martín, Antonio Upna; Carvajal, Ramón G.; Ramírez-Angulo, Jaime (IEEE, 2018)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      A micropower single-stage folded cascode amplifier able to drive a wide range of capacitive loads is presented. It features class AB operation and includes power-efficient adaptive biasing techniques, which provide enhanced ...
    • Low power channel selection filtering for highly integrated wireless receivers 

      García Alberdi, Coro Upna (2013)   Tesis doctoral / Doktoretza tesia  OpenAccess
      En este trabajo de investigación, se han propuesto y aplicado nuevas técnicas de baja tensión y bajo consumo en diseño analógico para implementar varios circuitos, principalmente filtros Gm-C. La tesis está estructurada ...
    • Low-power class-AB CMOS voltage feedback current operational amplifier with tunable gain and bandwidth 

      Esparza Alfaro, Fermín Upna; Pennisi, Salvatore; Palumbo, Gaetano; López Martín, Antonio Upna (IEEE, 2014)   Artículo / Artikulua  OpenAccess
      A CMOS class AB variable gain Voltage Feedback Current Operational Amplifier (VFCOA) is presented. The implementation is based on class AB second generation current conveyors and exploits an electronically tunable ...
    • Low-power ultrasonic front-end for cargo container monitoring 

      Algueta-Miguel, Jose M. Upna; García Oya, José Ramón; López Martín, Antonio Upna; Cruz Blas, Carlos Aristóteles de la Upna; Muñoz Chavero, Fernando; Hidalgo Fort, Eduardo (IEEE, 2019)   Artículo / Artikulua  OpenAccess
      A low-power ultrasonic communication system conceived for cargo container monitoring is presented. Two piezoelectric transducers operating at 40 kHz are used for generating and acquiring an ultrasonic signal through the ...
    • Low-voltage 0.81mW, 1-32 CMOS VGA with 5% bandwidth variations and -38dB DC rejection 

      López Martín, Antonio Upna; Rico-Aniles, Héctor Daniel; Ramírez-Angulo, Jaime; Rocha-Pérez, José Miguel; González Carvajal, Ramón (IEEE, 2020)   Artículo / Artikulua  OpenAccess
      A CMOS low-voltage amplifier with approximately constant bandwidth and DC rejection is introduced. The design is based on the cascade of a wide linear input range OTA, an op-amp and a servo-loop with extremely large time ...
    • A novel PLL architecture 

      Osa, Juan I.; Carlosena García, Alfonso Upna; López Martín, Antonio Upna (2000)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      A novel phase-locked loop scheme is proposed in this paper, whose main distinguishing features are infinite hold-in range, pull-out range fractionally constant and also a ripple fractionally constant. To this end, it ...
    • On the optimal current followers for wide-swing current-efficient amplifiers 

      López Martín, Antonio Upna; Garde Luque, María Pilar Upna; Carvajal, Ramón G.; Ramírez-Angulo, Jaime (IEEE, 2018)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      The design of various current followers for the implementation of OTAs with high slew rate and current efficiency is addressed. Two basic current follower topologies are compared, and modifications of both followers to ...
    • Power efficient simple technique to convert a reset-and-hold into a true-sample-and-hold using an auxiliary output stage 

      Rico Aniles, Héctor Daniel; Ramírez Angulo, Jaime; López Martín, Antonio Upna; González Carvajal, Ramón; Rocha Pérez, José Miguel; Garde Luque, María Pilar Upna (IEEE, 2020)   Artículo / Artikulua  OpenAccess
      A technique to implement true-sample-and-hold circuits that hold the output for almost the entire clock cycle without resetting to zero is introduced, alleviating the slew rate requirement on the op-amp. It is based on a ...
    • Power-efficient CMOS circuits for energy harvesting supplied IoT systems 

      Garde Luque, María Pilar Upna (2019)   Tesis doctoral / Doktoretza tesia  OpenAccess
      En esta tesis se han aplicado técnicas de baja tensión y bajo consumo para implementar nuevos circuitos analógicos (principalmente amplificadores). Estos circuitos están orientados a dispositivos energéticamente autónomos ...
    • Power-efficient current-mode analog circuits for highly integrated ultra low power wireless transceivers 

      Esparza Alfaro, Fermín Upna (2014)   Tesis doctoral / Doktoretza tesia  OpenAccess
      In this thesis, current-mode low-voltage and low-power techniques have been applied to implement novel analog circuits for zero-IF receiver backend design, focusing on amplification, filtering and detection stages. The ...
    • Sensing in coin discriminators 

      Carlosena García, Alfonso Upna; López Martín, Antonio Upna; Arizti, Fernando; Martínez de Guereñu, Ane; Pina Insausti, José L.; García Sayés, Miguel (IEEE, 2007)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      This paper describes the technologies used in coin discriminator devices, stressing the improvements and novel mechanisms introduced by the authors in the past few years as a result of the cooperation with one leading ...
    • Super class AB RFC OTA using non-linear current mirrors 

      Garde Luque, María Pilar Upna; López Martín, Antonio Upna; Carvajal, Ramón G.; Galan, J.A.; Ramírez-Angulo, Jaime (Institution of Engineering and Technology, 2018)   Artículo / Artikulua  OpenAccess
      An alternative approach to the design of super class AB recycling folded cascode operational transconductance amplifiers is proposed. Instead of using local common-mode feedback for boosting dynamic currents, simple current ...
    • Super class AB RFC OTA with adaptive local common-mode feedback 

      Garde Luque, María Pilar Upna; López Martín, Antonio Upna; Carvajal, Ramón G.; Ramírez-Angulo, Jaime (Institution of Engineering and Technology, 2018)   Artículo / Artikulua  OpenAccess
      A super class AB recycling folded cascode operational transconductance amplifier is presented. It employs local common-mode feedback using two matched tuneable active resistors, allowing to adapt the amplifier to different ...