Browsing by Author "Ramírez-Angulo, Jaime"
Now showing items 1-20 of 20
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±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
(IEEE, 2019)
Artículo / Artikulua 
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 ; González Carvajal, Ramón (MDPI, 2022)
Artículo / Artikulua
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 ; Algueta-Miguel, Jose M. ; Garde Luque, María Pilar ; Carvajal, Ramón G.; Ramírez-Angulo, Jaime (IEEE, 2020)
Contribución a congreso / Biltzarrerako ekarpena
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 ; González Carvajal, Ramón (IEEE, 2020)
Artículo / Artikulua
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 ; López Martín, Antonio ; Algueta-Miguel, Jose M. ; Ramírez-Angulo, Jaime; González Carvajal, Ramón (John Wiley & Sons, 2019)
Artículo / Artikulua
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 ; González Carvajal, Ramón (IEEE, 2019)
Artículo / Artikulua
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 ; Garde Luque, María Pilar ; Algueta-Miguel, Jose M. ; Beloso Legarra, Javier ; González Carvajal, Ramón; Ramírez-Angulo, Jaime (MDPI, 2021)
Artículo / Artikulua
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 ; González Carvajal, Ramón; Li, Frank X. (IEEE, 2021)
Artículo / Artikulua
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 ... -
Folded Cascode OTA with 5540 MHzpF/mA FoM
Garde Luque, María Pilar ; López Martín, Antonio ; Carvajal, Ramón G.; Ramírez-Angulo, Jaime (IEEE, 2018)
Contribución a congreso / Biltzarrerako ekarpena
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 ; Cruz Blas, Carlos Aristóteles de la ; López Martín, Antonio ; Ramírez-Angulo, Jaime (IEEE, 2021)
Artículo / Artikulua
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 ; González Carvajal, Ramón (IEEE, 2018)
Artículo / Artikulua
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 ; Rico-Aniles, Héctor Daniel; Ramírez-Angulo, Jaime; Rocha-Pérez, José Miguel; González Carvajal, Ramón (IEEE, 2020)
Artículo / Artikulua
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 ; Garde Luque, María Pilar ; Carvajal, Ramón G.; Ramírez-Angulo, Jaime (IEEE, 2018)
Contribución a congreso / Biltzarrerako ekarpena
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 ; González Carvajal, Ramón; Rocha-Pérez, José Miguel; Garde Luque, María Pilar (IEEE, 2020)
Artículo / Artikulua
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 ; González Carvajal, Ramón; Rocha-Pérez, José Miguel (IEEE, 2019)
Artículo / Artikulua
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 ... -
Super class AB RFC OTA using non-linear current mirrors
Garde Luque, María Pilar ; López Martín, Antonio ; Carvajal, Ramón G.; Galán, J.A.; Ramírez-Angulo, Jaime (Institution of Engineering and Technology, 2018)
Artículo / Artikulua
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 ; López Martín, Antonio ; Carvajal, Ramón G.; Ramírez-Angulo, Jaime (Institution of Engineering and Technology, 2018)
Artículo / Artikulua
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 ; González Carvajal, Ramón; Li, Frank X. (IEEE, 2021)
Artículo / Artikulua
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 ... -
Super-gain-boosted miller op-amp based on nested regulated cascode techniques with FoMAOLDC =24,614kV/V.MHz.pF/µWatt
Paul, Anindita; Ramírez-Angulo, Jaime; López Martín, Antonio ; González Carvajal, Ramón; Díaz Sánchez, Alejandro (IEEE, 2020)
Contribución a congreso / Biltzarrerako ekarpena
A simple technique to greatly enhance the DC open-loop gain of a Miller op-amp is introduced here. It is based on the utilization of nested regulated cascode amplifiers. It uses conventional Miller compensation and does ... -
Wide-swing class AB regulated cascode current mirror
Garde Luque, María Pilar ; López Martín, Antonio ; Cruz Blas, Carlos Aristóteles de la ; Carvajal, Ramón G.; Ramírez-Angulo, Jaime (IEEE, 2020)
Contribución a congreso / Biltzarrerako ekarpena
A micropower regulated cascode CMOS current mirror is presented, combining floating gate and quasi floating gate MOS transistors to achieve both wide swing and class AB operation, respectively. Measurement results for a ...
