HUERTAS DÍAZ , José Luis

A new CMOS circuit strategy for very low-voltage Pulse-Duration Modulators (PDM) is proposed. Optimization of voltage supply scaling below the sum of threshold voltages is based on Instantaneous Log Companding processing through the MOSFET operating in weak inversion. A 1 V VLSI PDM circuit for very low-voltage audio applications such as...

In this work, a way to cell-culture real-time monitoring system by means of the Oscillation-Based Test (OBT) methodology [1]is proposed and implemented with Texas Instrument (TI) components. The idea is inspired in previous works from the authors [1] in the area of testing analogue integrated circuits and deals with solving some critical points...

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.

A unified treatment of the active compensation for VCVS realized by operational amplifiers is presented. It is a summary of low-sensitivity circuit structures which can be either magnitude or phase compensated. The performance of such a circuits is discussed in detail. Experimental data for some of them are also included.

The self-purging technique is not commonly used mainly due to the lack of practical implementations of its key component, the threshold voter. A very efficient implementation of this voter is presented which uses a decomposition technique to substantially reduce the circuit complexity and delay, as compared to alternative implementations.

The authors describe a state assignment algorithm for FSMs which produces an assignment of non-necessarily distinct, and eventually, incompletely specified codes. In this new approach, state-reduction and state assignment are dealt with concurrently, and a restricted state splitting technique is explored. The algorithm is particularly...

Experiences with heuristics for the state reduction of finite-state machines are presented and two new heuristic algorithms described in detail. Results on machines from the literature and from the MCNC benchmark set are shown. The area of the PLA implementation of the combinational component and the design time are used as figures of merit....

A system for cell-culture real-time monitoring using an oscillation-based approach is proposed. The system transforms a cell culture under test into a suitable "biological" oscillator, without needing complex circuitry for excitation and measurement. The obtained oscillation parameters are directly related to biological test, owed to an...

This paper presents a collection of novel current-mode circuit techniques for the integration of very low-voltage (down to 1 V) low-power (few hundreds of μA) complete SoCs in CMOS technologies. The new design proposal is based on both, the Log Companding theory and the MOSFET operating in subthreshold. Several basic building blocks for audio...

Se describe una familia de redes de interconexión para sistemas multiprocesadores. Estas redes utilizan buses múltiples estructurados en varios niveles e incorporan el concepto de tolerancia a fallos mediante redundancia en las vías de comunicación. Sus principales características son: buena relación coste/ rendimiento, fiabilidad, modularidad...

A study of circular piezoelectric micro speakers is presented for applications in the audio frequency range, including values for impedance, admittance, noise figures, transducer gain, and acoustic frequency responses. The micro speakers were modelled based on piezoelectric micro ultrasonic transducer (pMUT) design techniques and principles. In...

A complete VHDL model of bistables including their metastable operation is presented. An RS-NAND latch has been modelled as a basic structure, orienting its implementation towards its inclusion in a cell library. Two applications are included: description of a more complex latch (D-type) and description of a circuit containing three latches...

Nowadays, metastability is becoming a serious problem in high-performance VLSI design, mainly due to the relatively-high probability of error when a bistable circuit operates at high frequencies. As far as we know, there is not any work published that justifies and formally characterizes metastable behavior in dynamic latches. With current...

A programmable switched-capacitor circuit for the generation of 1/f/sup y/ noise is reported. The circuit is described by a chaotic first-order piecewise-linear finite-difference equation which yields a hopping transition between regions of chaotic motions and hence produces 1/f/sup y/ noise. Experimental results illustrating the circuit...

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 performance of the circuit are also included.

The required building blocks of CMOS fuzzy chips capable of performing as adaptive fuzzy systems are described in this paper. The building blocks are designed with mixed-signal current-mode cells that contain low-resolution A/D and D/A converters based on current mirrors. These cells provide the chip with an analog-digital programming...