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In this paper a SPICE (Simulation Program with Integrated Circuit Emphasis) implementation of a memristor model able to describe the major and minor current-voltage loops in bipolar resistive switches is reported. In particular, this work addresses the implementation of one transistor-one resistor (1T1R) structures for RRAM applications by means of SPICE simulations. Specifically, the dependence of...
In order to drive both positive and negative directions in the shaft of a DC motor connected to a DC/DC Buck power electronic converter, this paper presents a new topology of the DC/DC Buck power electronic converter-DC motor system. To this end, a full-bridge converter is placed between the Buck converter and the DC motor. The deduction of the mathematical model step-by-step, from applying Kirchhoff's...
Multiphase interleaved synchronous boost converter is one of the most interesting topologies for non-isolated bidirectional applications due to its high efficiency, high reliability and low number of components. In order to increase the efficiency, this converter can work in Discontinuous Conduction Mode (DCM) but close to Boundary Conduction Mode (BCM), known as Quasi-Square Wave Zero Voltage Switching...
This paper presents a comparative study of three low-noise amplifiers for neural recording applications. The topologies are thoroughly analysed in terms of area, power consumption and noise performance. Further, the theoretical results are confirmed by simulations of transistor-level implementations in a 0.13 μm CMOS technology at 1.2 V supply voltage.
Envelope Tracking techniques are used to increase the efficiency of modern radiofrequency transmitters. These techniques are based on varying the supply voltage of the radiofrequency power amplifier according to the envelope of the signal to be transmitted. This paper presents an Envelope Tracking system based on a multilevel topology that targets relatively low voltage systems (12-28 volt range)...
The envelope tracking technique is used to increment the efficiency of modern radiofrequency transmitters. It is based on supplying the linear radiofrequency power amplifier of the transmitter with a time-varying voltage that tracks the envelope of the information signal being transmitted. These systems require a converter capable of varying its output voltage very fast and a control system able to...
This paper presents a design tool for the synthesis of pipeline ADCs which is able to optimally map high-level converter specifications, such as the required effective resolution, onto electrical-level parameters, i.e., transistor sizes and biasing conditions. It is based on the combination of a behavioural simulator for performance evaluation, accurate models of the converter components, and an optimization...
This paper deals with a new control method for power factor correctors based on flybackpsilas family converters (e.g., Buck-Boost, Flyback, SEPIC, Cuk and Zeta). The control is carried out by a standard IC controller for peak current-mode dc-dc converters, with only an exponential compensation ramp and a peak detector. Neither analog multiplier nor input voltage sensor are needed to achieve quasi-sinusoidal...
This paper deals with a new control method for power factor correctors based on flybackpsilas family converters (e.g., Buck-Boost, Flyback, SEPIC, Cuk and Zeta). The control is carried out by a standard IC controller for peak current-mode dc-dc converters, with only an exponential compensation ramp and a peak detector or low pass filter. Neither analog multiplier nor input voltage sensor are needed...
This paper presents a systematic approach to design smart-pixel chips in standard CMOS technologies. These chips include light sensors together with parallel analog signal-processing circuitry, on the same silicon substrate. Light detection is made with vertical CMOS-compatible BJTs, which yield contrasts larger by an order of magnitude than conventional photodiodes. A Darlington structure is presented...
A tunable/adaptive feedthrough-error cancelation technique for switched-current circuits is presented. A comparison, based on measurements from silicon prototypes designed with the same technology and equal geometries, shows an improvement of more than one order of magnitude as compared to the conventional dummy-switch technique. Robustness against local process or switch-geometry variations has been...
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