• ±0.25 V Class-AB CMOS capacitance multiplier and precision rectifiers 

      Pourashraf, Shirin; Ramírez-Angulo, Jaime; Hinojo Montero, José María; González Carvajal, Ramón; López Martín, Antonio Upna Orcid (IEEE, 2019)   Artículo / Artikulua  OpenAccess
      Reduction of minimum supply requirements is a crucial aspect to decrease the power consumption in VLSI systems. A high performance capacitance multiplier able to operate with supplies as low as ±0.25 V is presented. It is ...
    • ±0.3v bulk-driven fully differential buffer with high figures of merit 

      Gangineni, Manaswini; Ramírez-Angulo, Jaime; Vázquez-Leal, Héctor; Huerta-Chua, Jesús; López Martín, Antonio Upna Orcid; González Carvajal, Ramón (MDPI, 2022)   Artículo / Artikulua  OpenAccess
      A high performance bulk-driven rail-to-rail fully differential buffer operating from ±0.3V supplies in 180 nm CMOS technology is reported. It has a differential–difference input stage and common mode feedback circuits ...
    • 1-V 15-μW 130-nm CMOS super class AB OTA 

      López Martín, Antonio Upna Orcid; Algueta-Miguel, Jose M. Upna Orcid; Garde Luque, María Pilar Upna Orcid; Carvajal, Ramón G.; Ramírez-Angulo, Jaime (IEEE, 2020)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      A super class AB recycling folded cascode amplifier in 130 nm CMOS is presented. It combines for the first time adaptive biasing of the differential input pair, nonlinear current mirrors with current starving and dynamic ...
    • 360 nW gate-driven ultra-low voltage CMOS linear transconductor with 1 MHz bandwidth and wide input range 

      Rico-Aniles, Héctor Daniel; Ramírez-Angulo, Jaime; López Martín, Antonio Upna Orcid; González Carvajal, Ramón (IEEE, 2020)   Artículo / Artikulua  OpenAccess
      A low voltage linear transconductor is introduced. The circuit is a pseudo differential architecture that operates with ±0.2V supplies and uses 900nA total biasing current. It employs a floating battery technique to achieve ...
    • Class AB amplifier with enhanced slew rate and GBW 

      Garde Luque, María Pilar Upna Orcid; López Martín, Antonio Upna Orcid; Algueta-Miguel, Jose M. Upna Orcid; Ramírez-Angulo, Jaime; González Carvajal, Ramón (John Wiley & Sons, 2019)   Artículo / Artikulua  OpenAccess
      The design of a micropower class AB operational transconductance amplifier with large dynamic current to quiescent current ratio is addressed. It is based on a compact and power-efficient adaptive biasing circuit and a ...
    • CMOS first-order all-pass filter with 2-Hz pole frequency 

      Paul, Anindita; Ramírez-Angulo, Jaime; López Martín, Antonio Upna Orcid; González Carvajal, Ramón (IEEE, 2019)   Artículo / Artikulua  OpenAccess
      A CMOS fully integrated all-pass filter with an extremely low pole frequency of 2 Hz is introduced in this paper. It has 0.08-dB passband ripple and 0.029-mm2 Si area. It has 0.38-mW power consumption in strong inversion ...
    • Energy-efficient amplifiers based on quasi-floating gate techniques 

      López Martín, Antonio Upna Orcid; Garde Luque, María Pilar Upna Orcid; Algueta-Miguel, Jose M. Upna Orcid; Beloso Legarra, Javier Upna Orcid; González Carvajal, Ramón; Ramírez-Angulo, Jaime (MDPI, 2021)   Artículo / Artikulua  OpenAccess
      Energy efficiency is a key requirement in the design of amplifiers for modern wireless applications. The use of quasi-floating gate (QFG) transistors is a very convenient approach to achieve such energy efficiency. We ...
    • An enhanced gain-bandwidth class-AB miller op-amp with 23,800 MHz pF/mW FOM, 11-16 current efficiency and wide range of resistive and capacitive loads driving capability 

      Paul, Anindita; Ramírez-Angulo, Jaime; Díaz Sánchez, Alejandro; López Martín, Antonio Upna Orcid; González Carvajal, Ramón; Li, Frank X. (IEEE, 2021)   Artículo / Artikulua  OpenAccess
      A compact power-efficient class-AB Miller op-amp is introduced. It uses a simple auxiliary circuit that enhances the op-amp's gain-bandwidth product and helps to drive a wide range of capacitive and resistive loads with ...
    • Enhanced single-stage folded cascode OTA suitable for large capacitive loads 

      López Martín, Antonio Upna Orcid; Garde Luque, María Pilar Upna Orcid; Algueta-Miguel, Jose M. Upna Orcid; Cruz Blas, Carlos Aristóteles de la Upna Orcid; Carvajal, Ramón G.; Ramírez-Angulo, Jaime (IEEE, 2018)   Artículo / Artikulua  OpenAccess
      An enhanced single-stage folded cascode operational transconductance amplifier able to drive large capacitive loads is presented. Circuits that adaptively bias the input differential pair and the current folding stage ...
    • Folded Cascode OTA with 5540 MHzpF/mA FoM 

      Garde Luque, María Pilar Upna Orcid; López Martín, Antonio Upna Orcid; 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 ...
    • Gain-boosted super class AB OTAs based on nested local feedback 

      Beloso Legarra, Javier Upna Orcid; Cruz Blas, Carlos Aristóteles de la Upna Orcid; López Martín, Antonio Upna Orcid; Ramírez-Angulo, Jaime (IEEE, 2021)   Artículo / Artikulua  OpenAccess
      A new approach to design super class AB operational transcon-ductance amplifiers (OTAs) with enhanced large-signal and small-signal performance is presented. It is based on employing two nested positive and negative feedback ...
    • A highly efficient composite class-AB–AB Miller op-amp with high gain and stable from 15 pF up to very large capacitive loads 

      Pourashraf, Shirin; Ramírez-Angulo, Jaime; López Martín, Antonio Upna Orcid; González Carvajal, Ramón (IEEE, 2018)   Artículo / Artikulua  OpenAccess
      In this paper, a highly power-efficient class-AB–AB Miller op-amp is discussed. The structure uses gm enhancement based on local common-mode feedback to provide class-AB operation with enhanced effective gm , open-loop ...
    • Low-voltage 0.81mW, 1-32 CMOS VGA with 5% bandwidth variations and -38dB DC rejection 

      López Martín, Antonio Upna Orcid; 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 ...
    • On the optimal current followers for wide-swing current-efficient amplifiers 

      López Martín, Antonio Upna Orcid; Garde Luque, María Pilar Upna Orcid; 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 Orcid; González Carvajal, Ramón; Rocha-Pérez, José Miguel; Garde Luque, María Pilar Upna Orcid (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 ...
    • Pseudo-three-stage Miller op-amp with enhanced small-signal and large-signal performance 

      Paul, Anindita; Ramírez-Angulo, Jaime; López Martín, Antonio Upna Orcid; González Carvajal, Ramón; Rocha-Pérez, José Miguel (IEEE, 2019)   Artículo / Artikulua  OpenAccess
      A simple technique to implement highly power efficient class AB-AB Miller op-amps is presented in this paper. It uses a composite input stage with resistive local common mode feedback that provides class AB operation to ...
    • A review of techniques to enhance an amplifier's performance using resistive local common mode feedback 

      Ramírez-Angulo, Jaime; López Martín, Antonio Upna Orcid; Carvajal, Ramón G.; Torralba, Antonio; Huerta-Chua, Jesús (MDPI, 2023)   Artículo / Artikulua  OpenAccess
      A review of some of the most common applications of the resistive local common mode feedback technique to enhance amplifier’s performance is presented. It is shown that this simple technique offers essential improvement ...
    • Super class AB RFC OTA using non-linear current mirrors 

      Garde Luque, María Pilar Upna Orcid; López Martín, Antonio Upna Orcid; Carvajal, Ramón G.; Galán, 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 Orcid; López Martín, Antonio Upna Orcid; 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 ...
    • Super-gain-boosted AB-AB fully differential Miller op-amp with 156dB open-loop gain and 174MV/V MHZ pF/uW figure of merit in 130nm CMOS technology 

      Paul, Anindita; Ramírez-Angulo, Jaime; Díaz Sánchez, Alejandro; López Martín, Antonio Upna Orcid; González Carvajal, Ramón; Li, Frank X. (IEEE, 2021)   Artículo / Artikulua  OpenAccess
      A fully differential Miller op-amp with a composite input stage using resistive local common-mode feedback and regulated cascode transistors is presented here. High gain pseudo-differential auxiliary amplifiers are used ...

      El Repositorio ha recibido la ayuda de la Fundación Española para la Ciencia y la Tecnología para la realización de actividades en el ámbito del fomento de la investigación científica de excelencia, en la Línea 2. Repositorios institucionales (convocatoria 2020-2021).
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