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检索条件"任意字段=Conference on Ph.D Research in Microelectronics and Electronics"

共 836 条记录，以下是31-40 订阅

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Integrated GaN digital soft start-up for switching power converters 18

Integrated GaN digital soft start-up for switching power con...

引用

18th International conference on ph.d research in microelectronics and electronics (PRIME)

作者： Samperi, Katia Spina, Nunzio Pennisi, Salvatore Palmisano, Giuseppe Univ Catania DIEEI Catania Italy STMicroelectronics R&D ADG Catania Italy

ISBN: (纸本)9798350303209

This paper presents an integrated soft start-up circuit implemented in a 0.5-mu m GaN on Si technology suitable for on-chip integration in power applications. The proposed approach avoids the use of large on-chip or external capacitors to overcome the problem of voltage overshoot and inrush current at start up in switching power converters. It could be also adapted to the specific application by choosing the number of Flip Flops, or, for large start-up periods, using a counter, and setting the desired start-up signal duty cycle. Moreover, an optimized Flip Flop circuit topology has been proposed to reduce area occupation. The circuit working principle and the design challenges in GaN technology are discussed together with simulations. The circuit has been designed by considering worst-case conditions. A test buffer has been also included to drive the high external load capacitance of the readout device. Measured waveforms are reported that demonstrate the effective circuit operation and suitability for all-GaN integration.

关键词： Soft-Start Inrush Current Voltage Overshoot GaN ICs GaN power converter

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An Automatic Tuning System to Improve Near-Field Powering in Implanted electronics 17

An Automatic Tuning System to Improve Near-Field Powering in...

引用

17th conference on ph.d research in microelectronics and electronics (PRIME)

作者： Collu, Riccardo Salis, Cinzia Barbaro, Massimo Univ Cagliari Dept Elect & Elect Engn I-09123 Cagliari Italy

ISBN: (纸本)9781665467001

developments in the field of inductive charging have opened the door to the use of devices without a battery or with a wireless rechargeable battery. Although this aspect is significant in the field of wearable devices, it is even more significant in the field of transcutaneous connections for implanted electronics and batteries that can greatly benefit the safety and comfort of the patient. The performance on the ability to transmit and store energy through an inductive channel can, however, be influenced by various environmental and manufacturing factors, with significant variations on the effective values of the LC resonant pair. In this regard, an automatic tuning mechanism based on a SAR algorithm implemented in 180nm CMOS technology is proposed.

关键词： Implantable electronics Near-Field powering Wireless Power Transfer magnetic coupling automatic tuning

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A 2+1 Hybrid Incremental MASH Converter 17

A 2+1 Hybrid Incremental MASH Converter

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17th conference on ph.d research in microelectronics and electronics (PRIME)

作者： Colucci, Antonio Rigo, Massimo Fiocchi, Carlo Malcovati, Piero Bonizzoni, Edoardo Univ Pavia Dept Elect Comp & Biomed Engn Pavia Italy Ams OSRAM Grp Garching Germany Ams OSRAM Grp Pavia Italy

ISBN: (纸本)9781665467001

This paper explores the possibility of using the MASH (multi-stage noise shaping) technique in incremental converters to be used for x-rays detection, targeting a medium-high resolution in a limited conversion time. The presented 2+1 MASH receives at the input a current generated by a photodiode. The adopted scheme is hybrid as the input stage is continuous time while the remaining portion of the circuit operates at discrete time. The converter is studied at the behavioural level in the MATLAB-Simulink environment and some design trade-offs are analysed and discussed in details.

关键词： Multi-stage noise shaping Simulation X-ray detection Modulation Switches Mathematical models microelectronics

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A Fast-Response Reference Current Source for High- and Low-Side High-Voltage Current Mirrors for Gate-Shaping digital Gate drivers 18

A Fast-Response Reference Current Source for High- and Low-S...

引用

18th International conference on ph.d research in microelectronics and electronics (PRIME)

作者： Zekorn, Tobias Wehr, Erik Vohl, Kenny Wunderlich, Ralf Heinen, Stefan Rhein Westfal TH Aachen Integrated Analog Circuits & RF Syst Lab Kopernikusstr 16 D-52074 Aachen Germany

ISBN: (纸本)9798350303209

This paper presents the design of a fast-response reference current (I-FRR) source being the reference for the high-voltage output current sources of a gate shaping digital gate driver for Silicon-Carbide power MOSFETs. By shaping the switching waveform driving the power MOSFET, there are significant improvements regarding energy efficiency and electromagnetic compatibility obtainable. The maximum reference current for the output current mirrors of the gate driver is 44.7 mA with a total output current of 5.6 A. A maximum startup time of less than 50 ns over process and mismatch variations and the full temperature range of -40 degrees C to 150 degrees C is achieved. The total current consumption is 4.12 mA from 5 V with a reference current of 44.7 mA from 20V while operating. The turn-off current consumption is 0 mA from 20 V and the standby current consumption is 9.27 mA respectively.

关键词： fast-response reference current source high-voltage current mirror digital gate driver gate shaping Gate Shaper Integrated Circuit

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Low-complexity Machine Learning Architecture for Hardware-aware True Random Number Generators Assessment and Continuous Monitoring 18

Low-complexity Machine Learning Architecture for Hardware-aw...

引用

18th International conference on ph.d research in microelectronics and electronics (PRIME)

作者： Spinelli, F. Moretti, R. Addabbo, T. Vitolo, P. Licciardo, G. d. Univ Siena Dept Informat Engn & Math Siena Italy Univ Salerno Dept Ind Engn Fisciano SA Italy

ISBN: (纸本)9798350303209

A new machine learning approach of assessment and monitoring of True Random Number Generators (TRNGs) is explored in order to create a new technical framework for entropy source development and validation, based on the direct estimation of the core source entropy, which is suitable for hardware-based lightweight cryptography. It consists of the integration between a pre-processing stage and an Artificial Neural Network (ANN). The pre-processing stage continuously generates stochastically patterned images from number sequences provided by TRNGs with assigned entropy thresholds. The ANN processes the images to determine whether the TRNG entropy remains higher than the assigned threshold, dynamically, during the sequence generation. A custom dataset, generated from a Markovian TRNG has been used to train, validate and test a very compact 3-layer ANN. The model achieves accuracy, precision, recall, and F-score all equal to 98.28% averaged on the test set. The low computational complexity of the ANN, favored by the effectiveness of the pre-processing stage, which, in turn, requires a simple architecture to be implemented, proves that the proposed solution can be effectively employed for a perspective resource-constrained hardware implementation.

关键词： True Random Number Generators Artificial Neural Networks Machine Learning Lightweight Cryptography

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Time-Based Buck Converter with Variable Frequency dCM and ON-Time Correction for Seamless Transitions 18

Time-Based Buck Converter with Variable Frequency DCM and ON...

引用

18th International conference on ph.d research in microelectronics and electronics (PRIME)

作者： Melillo, Paolo Zaffin, Simone Gasparini, Alessandro Levantino, Salvatore Ghioni, Massimo Politecn Milan DEIB Milan Italy STMicroelectronics R&D Milan Italy

ISBN: (纸本)9798350303209

A time-based compensator represents an effective solution to overcome the limitations of the traditional voltage mode controllers, as it allows to reduce both the die area occupation and the quiescent power consumption without compromising the control loop performances. Buck converters driven by high switching frequencies suffer from relatively low efficiency in medium/light load conditions, given the large power losses associated to the switching activity. Usually, to overcome this limitation the converter is operated in pulse frequency modulation (PFM), which makes it necessary to design an additional control loop and adds a dC offset to the output voltage as well. This paper proposes a variable switching frequency time-based control, able to operate the converter both in continuous and discontinuous current mode to guarantee high efficiency for a wide load current range. In addition, seamless frequency transition are obtained with a dedicated on-time correction circuit, which keeps the average inductor current constant upon variations of the operating regime. The proposed method boosts the efficiency in medium-light load conditions, ensuring an overall efficiency above 85% over a wide load current range. The effectiveness of this technique is supported by theoretical analysis and simulation results.

关键词： on-time correction variable frequency buck converter time-based control dCM operation

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Interface Circuit for Low-Resistance Sensors Based on Noise Cancelling Technique 17

Interface Circuit for Low-Resistance Sensors Based on Noise ...

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17th conference on ph.d research in microelectronics and electronics (PRIME)

作者： Abdevand, M. M. Livornesi, d. Vergani, A. E. Malcovati, P. Bonizzoni, E. Univ Pavia Dept Elect Comp & Biomed Engn Pavia Italy STMicroelectronics Analog & MEMS Grp Cornaredo MI Italy

ISBN: (纸本)9781665467001

A resistive sensor is conventionally biased by a voltage divider or a Wheatstone bridge. Applying a precise bias on a low-resistance sensor with these conventional approaches, however, necessarily requires calibration of the components, which is time-consuming and costly for mass production. In this paper, we propose an analog front-end circuit for low-resistance sensors, based on a closed-loop bias circuit with high-impedance output, which does not require any calibration. In addition, after a comprehensive analysis of the bias noise, we introduce a noise canceling technique, which allows more than 25 dB reduction of the bias noise in the complete interface circuit, even in the presence of gain mismatches as large as 5%.

关键词： Mass production Bridge circuits Noise cancellation Calibration microelectronics Frequency measurement High frequency

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Acquisition RX Chain for PMUT-Based Highly Integrated Ultrasound Imaging Systems 17

Acquisition RX Chain for PMUT-Based Highly Integrated Ultras...

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17th conference on ph.d research in microelectronics and electronics (PRIME)

作者： Novaresi, Lara Terenzi, Marco Malcovati, Piero Mazzanti, Andrea Bonizzoni, Edoardo Univ Pavia Dept Elect Comp & Biomed Engn Pavia Italy STMicroelectronics Cornaredo MI Italy

ISBN: (纸本)9781665467001

This paper presents a design solution for a PMUT RX front-end for high performance portable ultrasound medical imaging systems. The PMUT transducer is part of a 1d array working in the 1-4 MHz frequency range. Adequate SNR and low power dissipation are ensured in the RX path thanks to a careful design flow focused onto specific imaging requirements, extracted considering the lumped-parameter equivalent circuit model of the transducer. Programmable gain [25 dB - 35 dB] is implemented to comply with a wide range of input acoustic pressure while distortion parameters are designed in order to provide good imaging qualities. Transistor level design and simulations performed in a BCd-SOI 0.16-mu m technology are shown as well.

关键词： Low-noise amplifiers Ultrasonic imaging Transducers Power dissipation microelectronics Transistors Probes

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CMOS driving circuit operating down to 77 K for single-photon emitting diode 17

CMOS driving circuit operating down to 77 K for single-photo...

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17th conference on ph.d research in microelectronics and electronics (PRIME)

作者： Castriotta, Michele Falbo, Alexander Orsenigo, Luca Olivieri, Fabio Ferrari, Giorgio Politecn Milan DEIB I-20133 Milan Italy Politecn Milan Dipartimento Fis I-20133 Milan Italy

ISBN: (纸本)9781665467001

A fully-integrated CMOS driving circuit for single-photon emitting diodes in silicon, optimized for space applications, is presented. The electronics comprises two 10-bit dACs in order to precisely set the on and off voltages of the diode based on the measured temperature by an integrated temperature sensor. A large driving voltage range of 0-5 V guarantees the maximum flexibility in the working temperature range from 77 K to 300 K. The chip also contains a pulse generator, capable of driving the diode with short pulses down to 20 ns triggered by an external signal, which is essential in a single-photon light source. The integrated circuit is realized in standard 150-nm CMOS technology, with a chip area of 1.2 mm(2) and a power consumption less than 6mW.

关键词： Cryogenic electronics single-photon driving circuit space applications

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A Novel Common-Gate Comparator with Auto-Zeroing Offset Cancellation 17

A Novel Common-Gate Comparator with Auto-Zeroing Offset Canc...

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17th conference on ph.d research in microelectronics and electronics (PRIME)

作者： dago, Alessandro Leoncini, Mauro Cattani, Alberto Levantino, Salvatore Ghioni, Massimo Politecn Milan DEIB Milan Italy STMicroelectronics AMG R&D Milan Italy

ISBN: (纸本)9781665467001

This paper presents a novel auto-zeroing common-gate comparator. This topology cancels the input-referred offset voltage by AC coupling the gates of the two input mosfets. The circuit operation is divided in two phases: in the first one, the circuit is in closed loop and samples the offset voltage as a voltage difference between two capacitors, while, in the second phase, the circuit is configured in open loop to compare the two input signals. Monte Carlo simulations run on a reference design in CMOS process shows that the offset standard deviation is reduced from 4.42mV down to 25.85 mu V. The designed comparator shows a 290 mu W power consumption from a 5V supply, while occupying a total area of 0.0156mm(2).

关键词： common-gate comparator offset cancellation zero-current detector (ZCd) resonant switched-capacitor converter (ReSCC)

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