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Operating CMOS circuits at subthreshold supply voltages is an attractive solution for substantial energy reduction, at the expense of strong timing performance degradation, for a broad range of battery operated appliances. One of the challenges of this approach in current technology nodes is the reduced available noise margin when operating at low supplies. This paper evaluates the Static Noise Margin...
Modular multilevel converters (MMC) have many advantages owing to their power-stage modularity. However, this modularity does not extend directly to the control. Particularly, the balancing control usually requires central coordination and increases in complexity with the system size. This paper presents a balancing control method for a more general modular multilevel converter with series and parallel...
This paper presents a multi-step predictive control framework for modular multilevel converters with series/parallel connectivity — a more generalized topology of the H-bridge-based modular multilevel converters. The controller coordinates a wide range of objectives including converter output voltage, power losses, and balancing of the battery state of charge. Though capable of considering multiple...
In this paper, a new ladder transistor clamped multilevel inverter topology is proposed with the aim of reducing the number of transistor, while maintaining the bidirectional-controlled current flow capability of the transistor-clamped topologies. The basic structural features of the topology are presented along with their operational purpose. The merits of the new topology with respect to other topologies...
A modern smart battery charger is made of a Dc-Dc converter working in two modes: Charge and Boost. The Zero Cross Detector (ZCD) circuit is a highly important block in a Dc-Dc converter for achieving low switching losses. This paper presents a new approach to a ZCD converter which works by predicting the current through the inductor in DCM mode, based on the voltage across the diode during the conduction...
Vertical GaN power semiconductors promise higher power with faster switching speeds but the development of this technology has been slowed. This is due to the expense and lack of familiarity with GaN substrates. This paper will detail the functionality of HRL's cutting-edge vertical GaN transistor which is mounted onto a specially made PCB and tested. The testing consists of a static characterization...
Conventional text-based information communications may cause misunderstanding particularly in case of a dialog between different generations, gender or cultural background. Intelligent communications may solve these problems by the aid of “happiness sensor” and retrieving additional information of personal record of the counterparts. Breakthroughs necessary to realize the intelligent communications...
In this paper, a non-overlap clock (NVC) generator for high accuracy fully differential Switched Capacitor (SC) readout circuit which is applied in Micro-Electro Mechanical System (MEMS) differential sensor is proposed. Compared with traditional generator, generating a set of non-overlap clock, this circuit generates a new set of clocks which are being nested inside the primary non-overlap clocks,...
This paper presents dc-dc converter based on voltage dividing class E amplifier. Class E2 dc-dc converter, which is one of the converter suitable for high operating frequency is studied. Class E2 dc-dc converter composed of a Class E amplifier and Class E rectifier. the amplifier side and rectifier side of class E2 dc-dc converter can achieve ZVS and ZDS. However, it is indicated that peak switch...
Lateral GaN-on-Si HEMT technology enables integrated high-voltage half-bridges with gate drivers. However, the capacitive coupling through a common conductive substrate influences switching characteristics. The measured hard-switching turn-on time with floating substrate increased to over 16 ns as compared to conventional source-connected substrate (1 ns), switching 300 V/4A with GaN ICs comprising...
The paper proposes a new step-up topology with high step-up conversion ratio. Dc analysis is performed and the static characteristics are derived revealing that the static conversion ratio exhibits a high voltage boost, the converter still operating at reasonable duty cycles. Compared to a classical Boost, the static conversion ratio at the same duty cycle D is (1+nD) time higher, where n is the transformer...
Gallium Nitride has shown its potential over traditional Silicon devices with low switching and conduction losses. However, fast switching transition poses great challenges in dynamic device characterization due to sensitivity to parasitics and high requirement in testing equipment. An accurate switching behavior characterization method is proposed in this paper with loop inductance minimization and...
This paper presents the analysis and design of isolated voltage-fed single-switch soft-switched converter for magnetron filament heating. A step-down transformer is used to obtain the required voltage conversion ratio and isolation. By low-damped resonance, the primary transistor achieves zero-voltage switching. The secondary diode naturally attains zero-current switching due to discontinuous current...
This paper presents a clock-feedthrough compensation technique for bootstrapped switches. The proposed technique utilizes a dummy transistor to generate a reverse voltage, which compensates the input-dependent error caused by clock feedthrough effect of sampling switch. Simulation result shows the differential sampling error of bootstrapped switch reduces from 7.2mV to 1.4mV for the worst case, operating...
Reliable power supplies are indispensable for the control component of high voltage direct current switches. But power cannot be directly acquired from the high voltage side of the grid. Wireless power transmission is a practicable solution of supplying power. The efficiency of wireless power transmission system is directly influenced by the efficiency of the power supply. A power supply used on wireless...
This paper introduces a very-high-power-transfer-density GaN-based capacitive wireless power transfer (WPT) system, suitable as one module of a multi-modular WPT system for charging of electric forklifts. This capacitive WPT system achieves very high power transfer density by operating at a high switching frequency (6.78 MHz) using a GaN-based inverter, and by utilizing innovatively designed L-section...
An advanced Ka-band (27.5–30 GHz) Solid State Switch Matrix, based on a high order scalability concept and high integration level has been developed under a Contract with the European Space Agency (ESA) for application in satellite communication. A 4×4 module demonstrator has been designed, manufactured and tested, as a building block of switch matrix scalable to very high order, up to 32 inputs ×...
An advanced Ka-band (27.5–30 GHz) Solid State Switch Matrix, based on a high order scalability concept and high integration level has been developed under a Contract with the European Space Agency (ESA) for application in satellite communication. A 4×4 module demonstrator has been designed, manufactured and tested, as a building block of switch matrix scalable to very high order, up to 32 inputs ×...
This work presents a wideband digital PA topology implemented in Gallium Nitride MMIC for a direct-digital RF transmitter. The topology employs a differential current mode driver and GaN inverter stage with active pull-up to drive an efficient switch-mode PA. By applying digital circuit design techniques in GaN, our approach enables wide-band digital drive of a switched-mode PA through pulse-width...
This paper systematically analyzed the tradeoff between writing operation time and tail bit of LRS, and provided the optimal writing operation time for 1T1R RRAM with the target LRS 500kn and HRS 10Mn. Under three different cases of pulse width, the experiment results all show that the optimal voltage amplitude and step could achieve a good tradeoff between writing operation time and tail bits of...
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