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The paper concerns ferroelectric film features and their application in the field of memory ICs design. The results of FRAM test memory cells irradiation are shown and discussed. The current responses of the memory cells are presented as well as the calculated value of polarization The measurement complex used during the experiment is described.
Flying capacitor multilevel (FCML) converters are known to naturally balance the capacitor voltages through the use of phase-shifted pulse-width modulation. However, in practice, the capacitor voltages can still deviate and active balancing is often required. This work investigates the origins of the voltage imbalance in practical implementations of such converters and presents corresponding solutions...
With the growing adoption of electrified transportation and need for active storage in the electrical grid, electrochemical energy storage has become increasingly important. Past electrochemical management systems have suffered from low efficiency, limited functionality, and extreme cost sensitivity in storage applications [1]. Most battery management systems used for state-of-charge (SOC) equalization...
This paper investigates the operation of a bi-directional interleaved converter. The DC-DC converter can operate both as a buck and a boost converter as per operating requirements. Design methodology for the converter operating in either modes is presented in detail. Analysis on duty cycle limits, voltage conversion ratios and efficiency including non-idealities of the converter is presented. Extensive...
The traditional boost PFC converter in critical conduction mode (CRM) usually suffers from low power factor (PF) in high input voltage and light load conditions due to the influence of the differential mode (DM) capacitor. With the capacitive current flowing into the DM capacitor, the input current has an evident leading phase and a period of dead time in these conditions. In order to solve this problem,...
Implantable functional electric stimulation (FES) systems are currently being investigated as treatment for some types of neural dysfunctions. For this purpose, several neural stimulator systems on a chip (SOCs) have been proposed for: deep brain stimulation (DBS), cochlear prosthesis, visual prosthesis (VP), and artificial limbs control. Two major and related issues in FES are the charge balancing...
A linear constant current light-emitting diode (LED) driver without off-chip inductor and capacitor is presented in this paper. The proposed driver consists of one resistor, one diode bridge and one controller integrated circuits (IC). The controller IC employs four LED strings and sequences their conduction to shape the output current in proportion to the input voltage. The controller IC was designed...
In radiator thermostat applications, DEAP (Dielectric Electro Active Polymer) actuator tends to be a good candidate to replace the conventional self-actuating or step motor based actuator due to its intrinsic advantages. The capacitive property and high voltage (HV) driving demand of DEAP actuator make a high voltage capacitive load driving system to be necessary. The only energy source battery determines...
The article introduces an off-line power supply, using the ALTAIR05T-800, an innovative all-primary controller, by STMicroelectronics. Using the proprietary patented all-primary sensing feedback technique, the IC is capable of providing accurate output voltage regulation and tight output current regulation, thus eliminating the need for any secondary side component. The proposed power supply is able...
In this paper, a single-phase voltage-doubler with mismatched capacitors that converts a single-phase AC voltage to two balanced DC output voltages is proposed. It is based on a half-bridge rectifier and consists of two legs: one rectification leg to convert the AC voltage to DC output voltage and one neutral leg to split the DC output voltage into two balanced DC output voltages. Moreover, under...
We propose a detector with the properties of a diode detector and with additional voltage gain within the same circuit. Thereto, the principle of the diode detector is implemented by an active control loop. By calculations, it is proven that the behavior is similar to the conventional diode detector. This is validated by measurements of a detector circuit which was implemented as part of an integrated...
An architecture of a programmable gain integrating amplifier is presented. The circuit operates using two clock phases for sampling and amplification and the gain is defined by the ratio between the pulse-width of a control signal and the integrator time constant, which is defined by a resistor and capacitor. The proposed architecture also has configuration switches that enable its use in the modes...
In this paper, an H∞ current controller is proposed to maintain a balanced neutral point for a three-phase four-wire inverter, which can be used in microgrid applications. The neutral-point circuit consists of a conventional neutral leg and a split DC link. The neutral point is balanced with respect to the two DC source terminals (as required, e.g., in neutral-point-clamped three-level converters)...
This paper presents a self-powered active electronic interface circuit for energy harvesting system based on an electromagnetic vibration transducer. The interface circuit has been designed to transfer the harvested energy to a storage capacitor. The circuit is a multi-cycle inductive step up AC/DC converter able to process every voltage pulse coming from the transducer; furthermore, it is supplied...
This paper presents a measurement-based data-processing approach to obtain parameters of multiple current components through a bulk decoupling capacitor for power integrity studies. A lab-made low-cost current probe is developed to measure the induced voltage due to the time-varying switching current. Then, a post data-processing procedure is introduced to separate and obtain the parameters of multiple...
To aid capacitor design for the most common topologies of switched mode power supplies, that is buck boost and flyback converters, an analytical approach to determine the RMS value of the ripple current and the peak-to-peak value of DC ripple voltage of the output capacitance is presented for the entire operation range. Hence the presented formulae facilitate capacitor design for this common DC-converter...
Models of integrated circuits (ICs) allow printed circuit board (PCB) developers to predict radiated and conducted emissions early in board development and allow IC manufactures insight into how to build their ICs better for electromagnetic compatibility (EMC). A model of the power delivery network, similar to the ICEM or LECCS model, was developed for a microcontroller running a typical program and...
This paper describes a comparative analysis between two topologies of operational amplifiers to design a 40 MS/s 12-bit pipeline analog to digital converter (ADC). The analysis includes AC and transient simulation to select the proper topology. This ADC is implemented in a 0.35 mum AMS CMOS technology with 3.3 V single power supply. The capacitors and selected operational amplifiers were scaled for...
The next generation of wireless communication is a ubiquitous radio system concept, providing wireless access from short-range to wide-area, with one single reconfigurable and adaptive system for all envisaged radio environments. This paper presents the design approach of RCO (reconfigurable concurrent oscillator) that simultaneously generates two or more signals of different frequencies that eliminate...
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