Now showing items 1-20 of 75

    • Icon

      A 0.13μm CMOS current steering D/A converter for PLC and VDSL applications  [Presentation]

      Ruiz Amaya, Jesús; Fernández Bootello, Juan Francisco; Rosa Utrera, José Manuel de la; Delgado Restituto, Manuel ; Río Fernández, Rocío del (2005)
      This paper describes the design of a 12-bit 80MS/s Digital-to-Analog converter implemented in a 0.13μm CMOS logic technology. The design has been computer-aided by a developed toolbox for the simulation and verification ...
    • Icon

      A 0.35 μm CMOS 17-bit@40-kS/s cascade 2-1 ΣΔ modulator with programmable gain and programmable chopper stabilization  [Presentation]

      Guerra Vinuesa, Oscar; Escalera Morón, Sara; Rosa Utrera, José Manuel de la; Medeiro Hidalgo, Fernando; Rodríguez Vázquez, Ángel Benito (The International Society for Optical Engineering - SPIE, 2005)
      This paper describes a 0.35μm CMOS chopper-stabilized Switched-Capacitor 2-1 cascade ΣDelta; modulator for automotive sensor interfaces. For a better fitting to the characteristics of different sensor outputs, the modulator ...
    • Icon

      A 0.35μm CMOS 17-bit@40kS/s Sensor A/D Interface Based on a Programmable-Gain Cascade 2-1 ΣΔ Modulator  [Presentation]

      García González, José Manuel; Escalera Morón, Sara; Rosa Utrera, José Manuel de la; Guerra Vinuesa, Oscar; Medeiro Hidalgo, Fernando; Río Fernández, Rocío del; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2004)
      This paper describes the design and electrical implementation of an A/D interface for sensor applications realized in a 0.35μm standard CMOS technology. The circuit is composed of a low-noise instrumentation preamplifier ...
    • Icon

      A 12-bit@40MS/s Gm-C Cascade 3-2 Continuous-Time Sigma-Delta Modulator  [Presentation]

      Tortosa Navas, Ramón; Aceituno, Antonio; Rosa Utrera, José Manuel de la; Rodríguez Vázquez, Ángel Benito; Fernández Fernández, Francisco Vidal (Institute of Electrical and Electronics Engineers, 2007)
      This paper reports the transistor-level design of a 130-nm CMOS continuous-time cascade ΣΔ modulator. The modulator topology, directly synthesized in the continuous-time domain, consists of a third-order stage followed by ...
    • Icon

      A 14-bit 4-MS/s Multi-bit Cascade Sigma-Delta Modulator in CMOS 0.35-um Digital Technology  [Presentation]

      Río Fernández, Rocío del; Medeiro Hidalgo, Fernando; Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (2000)
      This paper presents a 4th-order 3-stage cascade SD modulator that achieves 14-bit dynamic range at 4MS/s using low oversampling ratio. It includes a programmable multi-bit quantizer in the last stage, providing 2-, 3-, ...
    • Icon

      A 2.5-V CMOS Wideband Sigma-Delta Modulator  [Presentation]

      Río Fernández, Rocío del; Medeiro Hidalgo, Fernando; Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2003)
      A high-performance Sigma-Delta modulator for wireline communication applications is presenfed It employs a 4th-order cascade multi-bit architecfure that requires only 16 oversampling ratio, and has been implemented using ...
    • Icon

      A 2.5-V ΣΔ modulator in 0.25-um CMOS for ADSL  [Presentation]

      Río Fernández, Rocío del; Medeiro Hidalgo, Fernando; Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2002)
      This paper presents a dual-quantization SC Sigma-Delta Modulator intended for A/D Conversion in ADSL applications.
    • Icon

      A 2.5MHz 55dB Switched-Current BandPass ΣΔ Modulator for AM Signal Conversion  [Presentation]

      Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Medeiro Hidalgo, Fernando; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1997)
      We present a Switched-Current (SI) fourth-order bandpass ΣΔ modulator IC prototype. It uses fully-differential circuits in 0.8μm CMOS technology to obtain a Dynamic Range (DR) larger than 55dB at 2.5MHz center frequency ...
    • Icon

      A CMOS 0.8 μm fully differential current mode buffer for HF SI circuits  [Article]

      Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Medeiro Hidalgo, Fernando; Domínguez Castro, Rafael; Rodríguez Vázquez, Ángel Benito (Elsevier, 1998)
      We present a high-frequency fully-differential current-mode buffer to interface off-chip currents with no significant degradation of the frequency response, and to measure current-mode ICs using standard equipment. It has ...
    • Icon

      A CMOS 0.8- µm transistor-only 1.63-MHz switched-current bandpass ΣΔ modulator for AM signal A/D conversion  [Article]

      Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Río Fernández, Rocío del; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2000)
      This paper presents a CMOS 0.8-/spl mu/m switched-current (SI) fourth-order bandpass /spl Sigma//spl Delta/ modulator (BP-/spl Sigma//spl Delta/M) IC capable of handling signals up to 1.63 MHz with 105-bit resolution and ...
    • Icon

      A CMOS 110-dB@40-kS/s programmable-gain chopper-stabilized third-order 2-1 cascade sigma-selta modulator for low-power high-linearity automotive aensor ASICs  [Article]

      Rosa Utrera, José Manuel de la; Escalera Morón, Sara; Pérez Verdú, Belén; Medeiro Hidalgo, Fernando; Guerra Vinuesa, Oscar; Río Fernández, Rocío del; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2005)
      This paper describes a 0.35-μm CMOS chopper-stabilized switched-capacitor 2-1 cascade ΣΔ modulator for automotive sensor interfaces. The modulator architecture has been selected from an exhaustive comparison among multiple ...
    • Icon

      A CMOS fully-differential bandpass ΣΔ modulator using switched-current circuits  [Presentation]

      Rosa Utrera, José Manuel de la; Medeiro Hidalgo, Fernando; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1995)
      This paper presents a fourth-order bandpass sigma-delta modulator that has been designed using fully-differential switched-current circuits in a 0.8μm CMOS technology. The modulator prototype has been obtained by applying ...
    • Icon

      A design tool for high-resolution high-frequency cascade continuous- time Σ∆ modulators  [Article]

      Tortosa Navas, Ramón; Castro López, Rafael; Rosa Utrera, José Manuel de la; Rodríguez Vázquez, Ángel Benito; Fernández Fernández, Francisco Vidal (SPIE, 2007)
      This paper introduces a CAD methodology to assist the de signer in the implementation of continuous-time (CT) cas- cade Σ∆ modulators. The salient features of this methodology ar e: (a) flexible behavioral modeling ...
    • Icon

      A Direct Synthesis Method of Cascaded Continuous-Time Sigma-Delta Modulators  [Presentation]

      Tortosa Navas, Ramón; Rosa Utrera, José Manuel de la; Rodríguez Vázquez, Ángel Benito; Fernández Fernández, Francisco Vidal (2005)
      This paper presents an efficient method to synthesize cascaded sigma-delta modulators implemented with continuous-time circuits. It is based on the direct synthesis of the whole cascaded architecture in the continuous-time ...
    • Icon

      A fast readout electronic system for accurate spatial detection in ion beam tracking for the next generation of particle accelerators  [Article]

      Fernández Martínez, Begoña; Garzón-Camacho, A.; González Álvarez, Marcos Aurelio; Ceballos, Joaquín; Rosa Utrera, José Manuel de la (Institute of Electrical and Electronics Engineers Inc, 2015)
      This paper presents the design, implementation, and measurements of a complete electronic frontend intended for high-resolution spatial detection of ion beams at counting rates higher than 106 particles per second (p/s). ...
    • Icon

      A fourth-order bandpass ΣΔ modulator using current-mode analog/digital circuits  [Presentation]

      Rosa Utrera, José Manuel de la; Pérez Verdú, Belén; Medeiro Hidalgo, Fernando; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 1996)
      We present a fourth-order bandpass ΣΔ switched-current modulator IC in 0.8 μm CMOS single-poly technology. Its architecture is obtained by applying a lowpass to bandpass transformation (z-1 →-z-2) to a second-order lowpass ...
    • Icon

      A new high-level synthesis methodology of cascaded continuous-time ΣΔ modulators  [Article]

      Tortosa Navas, Ramón; Rosa Utrera, José Manuel de la; Fernández Fernández, Francisco Vidal; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2006)
      This brief presents an efficient method for synthesizing cascaded sigma–delta modulators implemented with continuous-time circuits. It is based on the direct synthesis of the whole cascaded architecture in the continuous-time ...
    • Icon

      A new reconfigurable cascade ΣΔ modulator architecture with inter-stage resonation and no digital cancellation logic  [Presentation]

      Morgado García de la Polavieja, Alonso; García Sánchez, Gerardo; Río Fernández, Rocío del; Rosa Utrera, José Manuel de la (2009)
      This paper presents a new two-stage cascade ΣΔ modula- tor architecture that uses inter-stage resonation to increase its effec- tive resolution as compared to conventional cascades and avoids the need for digital filtering ...
    • Icon

      A novel low-voltage reconfigurable ΣΔ modulator for 4G wireless receivers  [Presentation]

      Morgado García de la Polavieja, Alonso; Río Fernández, Rocío del; Rosa Utrera, José Manuel de la (2008)
      This paper presents a new adaptable cascade ΣΔ modulator architecture fo r low-voltage multi-stan- dard applications. It uses two reconfiguration strategies: a programmable global resonation and a variable loop-filter ...
    • Icon

      A SIMULINK-based approach for fast and precise simulation of switched-capacitor, switched-current and continuous-time /spl Sigma//spl Delta/ modulators  [Presentation]

      Moreno Reina, Javier; Rosa Utrera, José Manuel de la; Medeiro Hidalgo, Fernando; Romay, Rafael; Río Fernández, Rocío del; Pérez Verdú, Belén; Rodríguez Vázquez, Ángel Benito (Institute of Electrical and Electronics Engineers, 2003)
      This paper describes how to extend the capabilities of SIMULINK for the time-domain simulation of /spl Sigma//spl Delta/ modulators implemented by using switched-capacitor, switched-current and continuous-time circuits, ...