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    Chaos in a Switched-Capacitor Circuit  [Artículo]

    Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis; Chua, Leon O. (Institute of Electrical and Electronics Engineers, 1985)
    We report chaotic phenomena observed from a simple nonlinear switched-capacitor circuit. The experimentally measured bifurcation tree diagram reveals a period-doubling route to chaos. This circuit is described by a first-order ...
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    A Programmable Neural Oscillator Cell  [Artículo]

    Linares Barranco, Bernabé; Sánchez Sinencio, Edgar; Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis (Institute of Electrical and Electronics Engineers, 1989)
    A programmable analog neural oscillator cell architecture is presented. The proposed neuron circuit is of hysteretic neural nature with its implementation based on operational transconductance amplifiers (OTA's). The ...
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    A Chaotic Switched-Capacitor Circuit for 1/f Noise Generation  [Artículo]

    Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito; Espejo Meana, Servando Carlos; Huertas Díaz, José Luis (Institute of Electrical and Electronics Engineers, 1992)
    A switched-capacitor circuit is reported for the generation of 1 / fYnoise. The circuit is described by a chaotic first-order piecewise-finear discrete map which yields a hopping transition between regions of chaotic motions ...
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    Chaos via a piecewise-linear switch ed-capacitor circuit  [Artículo]

    Rodríguez Vázquez, Ángel Benito; Rueda Rueda, Adoración; Pérez Verdú, Belén; Huertas Díaz, José Luis (Institution of Engineering and Technology, 1987)
    A nonlinear switched-capacitor circuit that generates chaotic signals is reported. The circuit is described by a first-order piecewise-linear discrete equation that exhibits a chaotic dynamics. Experimental results ...
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    Switched-Current Chaotic Neurons  [Artículo]

    Delgado Restituto, Manuel; Rodríguez Vázquez, Ángel Benito (Institution of Engineering and Technology, 1994)
    The Letter presents two nonlinear CMOS current-mode circuits that implement neuron soma equations for chaotic neural networks. They have been fabricated in a double-metal, single-poly 1.6µm CMOS technology. The neuron soma ...
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    Switched-capacitor neural networks for linear programming  [Artículo]

    Rodríguez Vázquez, Ángel Benito; Rueda Rueda, Adoración; Huertas Díaz, José Luis; Domínguez Castro, Rafael (Institution of Engineering and Technology, 1988)
    A circuit for online solving of linear programming problems is presented. The circuit uses switched-capacitor techniques and is thus suitable for monolithic implementation. The connection of the proposed circuit to analogue ...
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    Robust high-accuracy high-speed continuous-time CMOS current comparator  [Artículo]

    Liñán Cembrano, Gustavo; Río Fernández, Rocío del; Domínguez Castro, Rafael; Rodríguez Vázquez, Ángel Benito (Institution of Engineering and Technology, 1997)
    The authors present a CMOS current comparator which employs nonlinear negative feedback to obtain high-accuracy (down to 1.5pA) and high-speed for low input currents (8ns at 50nA). The new structure features a speed ...
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    Novel active-compensated weighted summer  [Artículo]

    Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis (Institution of Engineering and Technology, 1980)
    A summer amplifier with extended bandwidth is proposed. Compensation of the frequency characteristics is achieved by employing two operational amplifiers instead of external reactive components.
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    Nonlinear switched-current CMOS IC for random signal generation  [Artículo]

    Delgado Restituto, Manuel; Medeiro Hidalgo, Fernando; Rodríguez Vázquez, Ángel Benito (Institution of Engineering and Technology, 1993)
    A nonlinear switched-current circuit is presented that implements a chaotic algorithm for the generation of broadband, white analogue noise. The circuit has been fabricated in a double-metal, single-poly 1.6µm CMOS technology ...
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    New analogue switch circuit having very low forward resistance  [Artículo]

    Huertas Díaz, José Luis; Rodríguez Vázquez, Ángel Benito; Rueda Rueda, Adoración (Institution of Engineering and Technology, 1984)
    A new circuit realisation for an analogue switch is reported. The main feature of the proposed design is the low value of the forward resistance as compared with commercial switches. Experimental data confirming the ...
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    Error control in simplification before generation algorithms for symbolic analysis of large analogue circuits  [Artículo]

    Rodríguez García, Juan D.; Guerra Vinuesa, Oscar; Roca Moreno, Elisenda; Fernández Fernández, Francisco Vidal; Rodríguez Vázquez, Ángel Benito (Institution of Engineering and Technology, 1999)
    Circuit reduction is a fundamental first step in addressing the symbolic analysis of large analogue circuits. A new algorithm for simplification before generation is presented which is very efficient in terms of speed and ...
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    CMOS optical-sensor array with high output current levels and automatic signal-range centring  [Artículo]

    Espejo Meana, Servando Carlos; Domínguez Castro, Rafael; Carmona Galán, Ricardo; Rodríguez Vázquez, Ángel Benito (Institution of Engineering and Technology, 1994)
    A CMOS compatible photosensor with high output current levels, and an area-efficient scheme for automatic signal-range centring according to illumination conditions are presented. The high output current levels allow the ...
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    CMOS 2.4μm chaotic oscillator: Experimental verification of chaotic encryption of audio  [Artículo]

    Delgado Restituto, Manuel; Liñán Cembrano, Gustavo; Rodríguez Vázquez, Ángel Benito (Institution of Engineering and Technology, 1996)
    The Letter reports the first experimental verification of chaotic encryption of audio using custom monolithic chaotic oscillators. We use Gm-C techniques to realise a chaotic modulator/ demodulator IC that implements a ...
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    Algorithm for efficient symbolic analysis of large analogue circuits  [Artículo]

    Wambacq, Piet; Gièlen, Georges G.E.; Sansen, Willy M.C.; Rodríguez Vázquez, Ángel Benito; Fernández Fernández, Francisco Vidal (Institution of Engineering and Technology, 1994)
    An algorithm is presented that generates simplified symbolic expressions for the small-signal characteristics of large analogue circuits. The expressions are approximated while they are computed, so that only the most ...
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    A switched-capacitor broadband noise generator for CMOS VLSI  [Artículo]

    Rodríguez Vázquez, Ángel Benito; Delgado Restituto, Manuel; Espejo Meana, Servando Carlos; Huertas Díaz, José Luis (Institution of Engineering and Technology, 1991)
    A switched-capacitor circuit is reported for the generation of broadband white noise in MOS VLSI. It is based on the implementation of a very simple chaotic discrete-time system. The concept is demonstrated via a 3ftm CMOS ...
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    Does the use of nest materials in a ground-nesting bird result from a compromise between the risk of egg overheating and camouflage?  [Artículo]

    Gómez, Jesús; Liñán Cembrano, Gustavo; Ramo, Cristina; Castro, Macarena; Pérez Hurtado, Alejandro; Amat, Juan A. (Company of Biologists, 2019)
    Many studies addressing the use of nest materials by animals have focused on only one factor to explain its function. However, the consideration of more than one factor could explain the apparently maladaptive choice of ...
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    10mhz cmos ota-c voltage-controlled quadrature oscillator  [Artículo]

    Linares Barranco, Bernabé; Rodríguez Vázquez, Ángel Benito; Sánchez Sinencio, Edgar; Huertas Díaz, José Luis (Institution of Engineering and Technology, 1989)
    A quadrature-type voltage-controlled oscillator with operational transconductance amplifiers and capacitors (OTA-C) is presented. A monolithic integrated CMOS test circuit is introduced to verify theoretical results. The ...
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    Smart-Pixel Cellular Neural Networks in Analog Current-Mode CMOS Technology  [Artículo]

    Espejo Meana, Servando Carlos; Rodríguez Vázquez, Ángel Benito; Domínguez Castro, Rafael; Huertas Díaz, José Luis; Sánchez Sinencio, Edgar (Institute of Electrical and Electronics Engineers, 1994)
    This paper presents a systematic approach to design CMOS chips with concurrent picture acquisition and processing capabilities. These chips consist of regular arrangements of elementary units, called smart pixels. Light ...
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    Efficient symbolic computation of approximated small-signal characteristics of analog integrated circuits  [Artículo]

    Wambacq, Piet; Fernández Fernández, Francisco Vidal; Gielen, Georges; Sansen, Willy M.C.; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1995)
    A symbolic analysis tool is presented that generates simplified symbolic expressions for the small-signal characteristics of large analog integrated circuits. The expressions are approximated while they are computed, so ...
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    Analog Neural Programmable Optimizers in CMOS VLSI Technologies  [Artículo]

    Domínguez Castro, Rafael; Rodríguez Vázquez, Ángel Benito; Huertas Díaz, José Luis; Sánchez Sinencio, Edgar (Institute of Electrical and Electronics Engineers, 1992)
    A 3-μm CMOS IC is presented demonstrating the concept of an analog neural system for constrained optimization. A serial time-multiplexed general-purpose architecture is introduced for the real-time solution of this kind ...

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