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Errors due to radiation effects are a growing reliability concern for modern aerospace systems. In particular, single-event transients (SETs) and single-event upsets (SEUs) due to charged ion strikes in integrated circuits (ICs) have resulted in data corruption and operational failures in space systems. As IC feature sizes continue to shrink, the vulnerability of electronic systems worsens as smaller...
Electromagnetic rail launcher has a wide range of applications. Inductive shunt device is usually paralleled with the rails of the launcher as an approach to limit muzzle arc by transferring armature current. The shunt parameters will significantly influence the rail current, armature velocity and device stress conditions, which also makes the physical process more complicated. In this paper a circuit-electromagnetic-mechanical...
This paper proposes a novel control technique for the Buck type DC-DC converters using adaptive backstepping control and Chebyshev neural network. To enhance the transient performance of both the capacitor voltage and the inductor current under nominal conditions, input voltage fluctuations and load variations, this control algorithm has been proposed. The systematic design of backstepping controller...
This paper highlights performance and efficiency benefits using time optimal control (TOC) in a synchronous buck converter, over an optimally tuned current mode control (CMC) for a step reference transient. An approximate second order closed loop model is obtained for CMC using type-II compensation, and critical performance limits are derived using a normalized framework. Under frequent step change...
This paper describes a switching-surface (SS) controlled dc-dc converter that operates in PFM (pulse-frequency modulation) mode. SS control in continuous-current mode (CCM) has, as an essential property, fast response to load transient. To realize the SS control, a simple circuit that generates a switching function by using only one operational amplifier is proposed. In addition to the CCM operation,...
This paper proposes a transformerless PV converter in which both dc-dc boost and inverter stages are implemented by using a single standard three-leg inverter. The proposed solution furnishes an important level of component count reduction of active devices, which means cost, size and losses reductions in power switches and diodes. Furthermore, the paper presents: i) relevant characteristics of the...
Power stage width segmentation has been verified to be effective to improve the efficiency of MHz integrated synchronous Buck converters (ISBC). However, the theoretical analysis of the relationship between the load current and the power stage width or the number of active baby cells had not yet been established. This paper suggests a breakdown analysis of the transient currents in power FETs and...
An improved definition of target impedance is proposed in this paper, which is derived from the time-domain waveforms of the IC transient current and the allowable voltage fluctuation. The proposed target impedance removes the unnecessary constraint in the original definition and allows for more cost-effective power distribution network (PDN) designs for consumer electronic products. A measurement...
There are two major switch-on transient phenomena of the capacitor: one is the transient over-voltage and the other is the inrush current. The transients will shorten the lifetime of the capacitor and furthermore they will damage the contactors of the switching device. In this paper, a novel method for mitigating the capacitor switch-on transients is developed. The operation principle of the proposed...
This paper deals with analysis and reduction of dc-voltage fluctuations in a single-phase active power filter caused by a sudden load change. The analysis reveals that the delay time of the harmonic detection causes dc-voltage fluctuations in transient states. A new control method is proposed to reduce the dc-voltage fluctuations, based on the analysis. As a result, the dc capacitor can be reduced...
Latchup test failures occurred at two IO pins of an IC. Failure analysis revealed damage at the ESD device of a neighboring power pin's ESD protection circuit. To identify the root cause of the problem, the behavior of the ESD circuit in response to the latchup trigger signal was monitored. The ESD protection circuit was found to anomalously respond to even DC-like latchup trigger pulses. A layout...
This document presents a compilation of results from tests performed by iRoC Technologies on SER induced by alpha particles on SRAM memories for technology nodes from 180 nm to 65 nm. The aim of this study is to establish the variation of sensitivity with technology node for SEU and MCU, and to analyze the possible influence of different designs and technological parameters at a given technology node.
With technology scaling, vulnerability to soft errors in random logic is increasing. There is a need for on-line error detection and protection for logic gates even at sea level. The error checker is the key element for an on-line detection mechanism. We compare three different checkers for error detection from the point of view of area, power and false error detection rates. We find that the double...
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...
Predicting methods of common mode radiated emission of power bus structure have been investigated. Transient current flows at the power supply terminal was assumed to an exciting source, and the power bus consisted of power and ground planes was assumed to work as antenna of common mode radiation. Two simulation approaches were studied: one is a time-domain response-based approach, and another one...
High performance voltage-regulator-modules (VRMs) for the new generation of microprocessors have many strict and challenging specifications that include high power-density, high output-current capability, low output-voltage deviation and fast transient-response. In this paper, a dual mode control multiphase DC/DC converter is presented. The proposed scheme combines voltage and hysteretic control modes...
As the switching frequency of a dc-dc converter is raised from 100 kHz to 1 MHz, one would expect the energy storage elements of the circuit to be correspondingly reduced in size. If the circuit must meet input and output ripple requirements of the nature of MIL-STD-461B CEO3, however, the advantage of a higher switching frequency is significantly offset by the higher filter attenuation levels required...
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