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Self powered energy management circuits make energy harvesting converters more efficient and more reliable. This paper presents an improvement of a self-powered parallel synchronized switch harvesting on inductor (P-SSHI) circuit for piezoelectric transducers. Two different switching techniques are evaluated, which are switching based on two MOSFETs controlled by two operational amplifiers and switching...
This paper focuses on analysis and behavioral modeling of CMOS RDAC (redundant disk array controller) potentiometers, using string DAC (digital-to-analog converter) or Kelvin divider architecture. The model is developed by using VHDL-AMS language and accurately reflects the basic DC and AC transfer characteristic at various modes of operation for linear and nonlinear increment/decrement of the wiper...
The class-E power amplifier is widely used due to its high efficiency, resulting from switching at zero voltage and zero slope of the switch voltage (i.e. ZVS and DZVS). This paper presents an analytical expression of the gain between the DC input voltage and the peak switch voltage on an ideal class-E power amplifier (PA) with finite dc-feed inductance, ZVS and DZVS operation. This expression is...
This paper addresses stability issues of DC networks with constant power loads (CPL). Common DC networks, such as automotive electrical systems and DC microgrids, typically have a step-up/down converter connected in one side to the main bus and, on the other, to the load. When load is constant power it can generate destabilizing effects if not proper controlled. This paper shows that converters driving...
In the last years, the advances on power electronics technology have led to many switching converters design, whose switching on-off property is more efficient than traditional rheostat based converters, which power losses are higher. Therefore, the switching converters are present at many devices, like photovoltaic systems, no-break circuits and DC settable voltage sources. A typical DC/DC converter...
A novel Impedance Generation Circuit is proposed in this paper and is also implemented. The need for this is the lack of availability of such a device in the market at an affordable price and also the versatility it provides. Decade boxes such as DRB, DCB or DLB use switching of the corresponding passive elements (R, C, L variations) whereas the device proposed in this paper uses only variations in...
This paper studies the influence of different implementation methods of a simple control algorithm over the chaotic behavior of a specified circuit. Two new methods are presented: one is using a microcontroller and the other is using logical gates. The article also presents a unique approach to modelling a negative resistance as simple as possible, closely resembling a proposed mathematical dependency.
An equivalent electrical circuit model for the switching conduction characteristics of TiO2-based metal-insulator-metal structures is proposed. The model consists of two antiparallel diodes in combination with series and parallel resistances, which represent the filamentary current pathway spanning the oxide layer and the possible parasitic conduction effects, respectively. The diode parameters are...
In this paper, we present COFFE (Circuit Optimization For FPGA Exploration), a new fully-automated transistor sizing tool for FPGAs. Automated transistor-level CAD tools are an important part of the architecture exploration flow because they provide accurate area and delay estimates of low-level FPGA circuitry, which must be obtained for each architecture. We show that modeling transistors as linear...
This paper presents a HSPICE macromodel of a phase change memory (PCM) by considering the phenomenon of drift behavior as leading to incorrect operation. The model simulates the behavior due to the drift in the resistance and threshold voltage when the cell is not been read or programmed. It considers not only the resistance change by phase (as corresponding to the two phases, amorphous and crystalline),...
In this note we briefly reviewed literature on DC models focusing on losses associated with parasitic capacitor and switch resistances in switched-capacitor converters. We give topological formulas for equivalent output resistances in limit modes of operation. Next we propose an improved metric on output resistance in intermediate SSL-FSL mode, in the Minkowski distance form. Unified formulas have...
The search for compact autonomous devices has been increasing in the microelectronics industry. These devices have the capacity to generate their own energy in order to be charged. One of the ways of harvesting environmental energy for charging such devices is by using mechanical vibrations through the use of variable capacitor. Taking this principle a basis, this work presents a behavioral analysis...
A simple analytical model for the switching I-V characteristic in electroformed metal-insulator-metal structures is reported. The transitions from the OFF state (high resistance) to the ON state (low resistance) and back are modeled using an equivalent electrical circuit model consisting in two opposite-biased diodes with a series resistance. It is shown how the I-V characteristics are achieved by...
The interaction between a fault arc and the power system has a big influence on evaluation of successful reclosing of a faulted system. In this paper, the single phase reclosing performance of the system is considered using Thailand 500 kV transmission system between Mae Moh and Tha Ta Ko substations as examples. The work has been investigated using simplified arc model. The study has used EMTP simulation...
Switching processes of carbon-based resistive memory cells are simulated on a fully atomistic level by the molecular dynamics (MD) method and the Extended-Hu??ckel-Theory-based Non Equilibrium Green's Function (EHT-NEGF) method. Graphitic filament breakage and re-growth are found to be responsible for the switching of resistance of carbon-based memory. Key parameters that affect the switching speed...
This paper demonstrates that memristors can be used to form a fine resolution programmable resistance without perturbations by parasitic components. By exploiting the memristor characteristics, fine resolution programmable memristance is achieved by varying the amount of charges flowing or flux across the memristor. Under the same circuit configuration with same or even less amount of parasitics,...
Emerging concepts of non-volatile memories are more and more investigated to replace conventional charge storage-based devices like EEPROM or Flash. One of these promising memory concepts is called Resistive Switching Memory (ReRAM). Such memory is based on a switching mechanism controlled in current and/or voltage, between two distinct resistive states depending upon the material nature integrated...
This paper discusses in detail the development process of general interface adapter in the digital circuit fault diagnosis system based on VXI. After introducing VXI bus, the paper gives overall description of fault diagnosis system, presents a method of solving the problem about load matching and interface matching, and realizes the function of identification to read and write on the memory of interface...
An on-chip buck converter with 3D chip stacking is proposed and the operation is experimentally verified. The manufactured converter achieves a maximum power efficiency of 62% for an output current of 70mA with a switching frequency of 200MHz and a 2x2mm on-chip LC output filter in 0.35mum CMOS. The use of glass epoxy interposer to increase the maximum power efficiency up to 71.3%, and the power efficiency...
This paper introduces a novel current sense amplifier (CSA) in sub-32nm fully depleted (FD) double-gate (DG) silicon-on-insulator (SOI) technology with planar independent self-aligned gates. A new architecture is proposed which takes advantage of the back gate in order to improve circuit properties. Compared to the reference circuit, the new architecture proves to be faster (21% sensing delay decrease),...
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