An analog circuit for the compensation of pressure effects in thermal flow meters is presented. T... more An analog circuit for the compensation of pressure effects in thermal flow meters is presented. The result is obtained by modulating the power delivered to the heater by means of a feedback loop that senses the pressure variations with no need of an additional pressure sensor. A possible system architecture is proposed and the effectiveness of the method is demonstrated
I segnali d’uscita dei sensori integrati sono tipicamente a bassa potenza, in special modo se son... more I segnali d’uscita dei sensori integrati sono tipicamente a bassa potenza, in special modo se sono presenti trasduttori autogeneranti; la loro amplificazione risulta quindi critica, e tuttavia necessaria per renderli facilmente trattabili da convenzionali sistemi di condizionamento e di elaborazione. L’obiettivo di questa tesi è quello di progettare una catena di amplificazione particolarmente sensibile, in grado di leggere i segnali provenienti da un sensore di portata basato su termocoppie; sia il sensore, sia l’interfaccia di lettura verranno integrati sul solito die di silicio. Questo lavoro si suddivide in cinque capitoli: Capitolo 1 : Viene fatta una breve panoramica sui sensori integrati di portata ed è data una descrizione di massima dei principi fisici implicati nella trasduzione delle grandezze: dal flusso al segnale elettrico. Si è dedicata particolare attenzione ai sensori di portata calorimetrici ed al loro pilotaggio, in quanto il circuito qui progettato, è destinato a...
An apparatus and a method using no switching elements for multiplexing and reading arrays of sens... more An apparatus and a method using no switching elements for multiplexing and reading arrays of sensors whose electrical resistance is modulated by the signals to be measured are proposed. Sensor elements are arranged in group and columns where each column is fed with a continuous voltage waveform of different amplitude, frequency and phase characteristics which then produce current signals that are modulated by the variable resistance signals to be measured. Modulated currents are summed row-wise and collected at the read-out circuits, either by applying a constant voltage to each row of the array or by connecting a capacitor and converting these current summations into output voltage signals. The read-out circuits de-multiplex each individual sensor signal to be measured by means of lock-in demodulation according to the frequencies and phases employed for the stimulation of each column.Peer reviewedConsejo Superior de Investigaciones científicas (España), Universitat Autònoma de Barc...
Biosensor inalámbrico, portátil y reutilizable. La presente invención se refiere a un dispositivo... more Biosensor inalámbrico, portátil y reutilizable. La presente invención se refiere a un dispositivo biosensor para la determinación de analitos, no invasivo mediante la visualización de un cambio de color, y a partir de una muestra de líquido. La presente invención se enmarca en el ámbito dispositivos para la salud, control durante realización de deporte, la seguridad laboral y la industria alimentaria.Peer reviewedConsejo Superior de Investigaciones Científicas (España)A1 Solicitud de patente con informe sobre el estado de la técnic
[EN] The invention comprises at least one digital active pixel including: an optical sensor which... more [EN] The invention comprises at least one digital active pixel including: an optical sensor which generates a current Isens as a function of an illumination power, a current-tunable high-pass filter which generates an effective current Ieff from the Isens current, and a phase-locked loop which generates a current Itune from a frequency signal ftune generated by external digital control signals, the Itune current being the tuning current of the tunable high-pass filter.[ES] Comprende al menos un píxel activo digital que tiene un sensor óptico que genera una corriente Isens en función de una potencia de iluminación, un filtro paso-alto sintonizable por corriente que genera una corriente efectiva Ieff a partir de la corriente Isens y un lazo de enganche de fase que genera una corriente Itune a partir de una señal de frecuencia ftune generada por unas señales digitales externas de control, siendo la corriente Itune la corriente de sintonización del filtro paso-alto sintonizablePeer reviewedConsejo Superior de Investigaciones CientíficasA1 Solicitud de patente con informe sobre el estado de la técnic
2017 32nd Conference on Design of Circuits and Integrated Systems (DCIS), 2017
In this work a new design methodology for the low-power design of switched-capacitors delta-sigma... more In this work a new design methodology for the low-power design of switched-capacitors delta-sigma modulators using the recently introduced switched-variable-mirror amplifiers (SVMAs) is presented. The effectiveness of the methodology is demonstrated for a third-order single-loop single-bit delta-sigma modulator employing SVMAs designed in a standard 0.18 μm CMOS technology. Results show that the proposed methodology allows for the design of state-of-the-art high-resolution ADCs while greatly boosting design cycles by removing the need for time consuming full electrical simulations.
In this paper a new CMOS current-mode four-quadrant analog multiplier circuit based on squarer ci... more In this paper a new CMOS current-mode four-quadrant analog multiplier circuit based on squarer circuit is proposed. The dual translinear loop is the basic building block in realization scheme. Supply voltage is 3.3 V. The major advantages of this multiplier are high speed, low power, high linearity and less dc offset error. The circuit is designed and simulated using HSPICE
This paper proposes a compact switched-capacitor (SC) multi-bit flash quantizer for low-power hig... more This paper proposes a compact switched-capacitor (SC) multi-bit flash quantizer for low-power high-resolution delta-sigma modulators (ΔΣMs). First, a general power model for single-loop ΔΣMs is presented to show the importance of using multi-bit quantization when facing high-resolution specifications. In this context, a SC multi-bit quantizer circuit is proposed, which exhibits low-power operation, high modularity, single comparator design and compatibility with both multi-feedforward ΔΣM architectures and other SC low-power circuit techniques, like clocked comparators and switched OpAmps. A practical 50-kHz 16-bit ΔΣM design case is also presented.
The fabrication and experimental characterization of a thermal flow meter, capable of detecting a... more The fabrication and experimental characterization of a thermal flow meter, capable of detecting and measuring two independent gas flows with a single chip, is described. The innovative aspect of the sensor is the use of a plastic adapter, thermally sealed to the chip, to convey the gas flow only to the chip areas where the sensors are located. The packaging
An analog circuit for the compensation of pressure effects in thermal flow meters is presented. T... more An analog circuit for the compensation of pressure effects in thermal flow meters is presented. The result is obtained by modulating the power delivered to the heater by means of a feedback loop that senses the pressure variations with no need of an additional pressure sensor. A possible system architecture is proposed and the effectiveness of the method is demonstrated
I segnali d’uscita dei sensori integrati sono tipicamente a bassa potenza, in special modo se son... more I segnali d’uscita dei sensori integrati sono tipicamente a bassa potenza, in special modo se sono presenti trasduttori autogeneranti; la loro amplificazione risulta quindi critica, e tuttavia necessaria per renderli facilmente trattabili da convenzionali sistemi di condizionamento e di elaborazione. L’obiettivo di questa tesi è quello di progettare una catena di amplificazione particolarmente sensibile, in grado di leggere i segnali provenienti da un sensore di portata basato su termocoppie; sia il sensore, sia l’interfaccia di lettura verranno integrati sul solito die di silicio. Questo lavoro si suddivide in cinque capitoli: Capitolo 1 : Viene fatta una breve panoramica sui sensori integrati di portata ed è data una descrizione di massima dei principi fisici implicati nella trasduzione delle grandezze: dal flusso al segnale elettrico. Si è dedicata particolare attenzione ai sensori di portata calorimetrici ed al loro pilotaggio, in quanto il circuito qui progettato, è destinato a...
An apparatus and a method using no switching elements for multiplexing and reading arrays of sens... more An apparatus and a method using no switching elements for multiplexing and reading arrays of sensors whose electrical resistance is modulated by the signals to be measured are proposed. Sensor elements are arranged in group and columns where each column is fed with a continuous voltage waveform of different amplitude, frequency and phase characteristics which then produce current signals that are modulated by the variable resistance signals to be measured. Modulated currents are summed row-wise and collected at the read-out circuits, either by applying a constant voltage to each row of the array or by connecting a capacitor and converting these current summations into output voltage signals. The read-out circuits de-multiplex each individual sensor signal to be measured by means of lock-in demodulation according to the frequencies and phases employed for the stimulation of each column.Peer reviewedConsejo Superior de Investigaciones científicas (España), Universitat Autònoma de Barc...
Biosensor inalámbrico, portátil y reutilizable. La presente invención se refiere a un dispositivo... more Biosensor inalámbrico, portátil y reutilizable. La presente invención se refiere a un dispositivo biosensor para la determinación de analitos, no invasivo mediante la visualización de un cambio de color, y a partir de una muestra de líquido. La presente invención se enmarca en el ámbito dispositivos para la salud, control durante realización de deporte, la seguridad laboral y la industria alimentaria.Peer reviewedConsejo Superior de Investigaciones Científicas (España)A1 Solicitud de patente con informe sobre el estado de la técnic
[EN] The invention comprises at least one digital active pixel including: an optical sensor which... more [EN] The invention comprises at least one digital active pixel including: an optical sensor which generates a current Isens as a function of an illumination power, a current-tunable high-pass filter which generates an effective current Ieff from the Isens current, and a phase-locked loop which generates a current Itune from a frequency signal ftune generated by external digital control signals, the Itune current being the tuning current of the tunable high-pass filter.[ES] Comprende al menos un píxel activo digital que tiene un sensor óptico que genera una corriente Isens en función de una potencia de iluminación, un filtro paso-alto sintonizable por corriente que genera una corriente efectiva Ieff a partir de la corriente Isens y un lazo de enganche de fase que genera una corriente Itune a partir de una señal de frecuencia ftune generada por unas señales digitales externas de control, siendo la corriente Itune la corriente de sintonización del filtro paso-alto sintonizablePeer reviewedConsejo Superior de Investigaciones CientíficasA1 Solicitud de patente con informe sobre el estado de la técnic
2017 32nd Conference on Design of Circuits and Integrated Systems (DCIS), 2017
In this work a new design methodology for the low-power design of switched-capacitors delta-sigma... more In this work a new design methodology for the low-power design of switched-capacitors delta-sigma modulators using the recently introduced switched-variable-mirror amplifiers (SVMAs) is presented. The effectiveness of the methodology is demonstrated for a third-order single-loop single-bit delta-sigma modulator employing SVMAs designed in a standard 0.18 μm CMOS technology. Results show that the proposed methodology allows for the design of state-of-the-art high-resolution ADCs while greatly boosting design cycles by removing the need for time consuming full electrical simulations.
In this paper a new CMOS current-mode four-quadrant analog multiplier circuit based on squarer ci... more In this paper a new CMOS current-mode four-quadrant analog multiplier circuit based on squarer circuit is proposed. The dual translinear loop is the basic building block in realization scheme. Supply voltage is 3.3 V. The major advantages of this multiplier are high speed, low power, high linearity and less dc offset error. The circuit is designed and simulated using HSPICE
This paper proposes a compact switched-capacitor (SC) multi-bit flash quantizer for low-power hig... more This paper proposes a compact switched-capacitor (SC) multi-bit flash quantizer for low-power high-resolution delta-sigma modulators (ΔΣMs). First, a general power model for single-loop ΔΣMs is presented to show the importance of using multi-bit quantization when facing high-resolution specifications. In this context, a SC multi-bit quantizer circuit is proposed, which exhibits low-power operation, high modularity, single comparator design and compatibility with both multi-feedforward ΔΣM architectures and other SC low-power circuit techniques, like clocked comparators and switched OpAmps. A practical 50-kHz 16-bit ΔΣM design case is also presented.
The fabrication and experimental characterization of a thermal flow meter, capable of detecting a... more The fabrication and experimental characterization of a thermal flow meter, capable of detecting and measuring two independent gas flows with a single chip, is described. The innovative aspect of the sensor is the use of a plastic adapter, thermally sealed to the chip, to convey the gas flow only to the chip areas where the sensors are located. The packaging
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Papers by Michele Dei