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Low dropout voltage regulators (LDO) use a large external capacitor, in the range of few micro-farads. These external capacitors occupy valuable board space, increase the IC pin count and prohibit System-On-Chip (SoC) solutions. The large external capacitor is replaced with a reasonable InF internal capacitor. The capacitor-less LDO is designed for an output voltage of 1.4V for a given supply voltage...
This paper proposes a reliability-aware application mapping for mesh-based NoCs. The proposed reliable mapping, called RMAP, adds redundant communications to the application graph in order to improve the reliability of packet delivery in NoCs. The RMAP divides the application graph into two sub-graphs which have the lowest possible communication with each other. One of the sub-graphs is mapped on...
This paper presents an analog to digital converter (ADC) capable of resolving 8 bits at a sampling rate of 250 MSPS. Primary objective of the design has been to make a trade-off between power consumption and resolution while keeping the sampling rate high. The parallel-pipeline architecture was best fit for such requirements. A new sub-ADC scheme has been introduced here to remove possible switch...
In power electronics efficiency improvement is constantly being sought out through venues such as improved topologies or improved devices. Series loaded resonant (SLR) DC-DC converter is a type of soft-switching topology widely known for providing improved efficiency. This paper investigates the efficiency and transient performance of SLR when a new type of diode called Super Barrier RectifierTM is...
Analysis of transient behavior is important for class E amplifier because high peak switch voltage may be imposed to the transistor in the transient response. However, transient behavior of class E amplifier due to load variation was not analyzed yet. In this paper, transient behavior of a class E amplifier due to load variation is simulated with PSPICE. As a result, it is found that a high transient...
This paper describes a fully digital controlled switching mode DC-DC converter based on digital V2 control algorithm. V2 control in analog or digital realization can provide faster transient response compare to the conventional voltage or current-mode control. However, the reported digital V2 control scheme suffers from steady state oscillation problem. In this paper, we proposed a new digital V2...
With the wide use of extra high voltage gas insulated substation (GIS), very fast transient over-voltage (VFTO) generated by switching operations threatens the insulation of some equipments even the security of power system. For a 500 kV GIS, the model has been built up and the parameters have been selected in this paper. The variations of VFTO magnitudes along the GIS bus nodes during different switching...
The new problems when applying a conventional resistor-capacitor-diode (RCD) clamp snubber to the high power combined three-phase inverter system are investigated. In high power application, the existence of parasitic induction in dc bus makes an additional energy loss on the RCD clamp snubber. The particular topology of combined three-phase inverter makes this situation worse. In this paper, a combined...
Loaded switches are frequent for the running electric locomotive. The frequencies, phases and amplitudes between the system voltage and residual voltage may be different when the transformer is put into use. The transient responses at different time points are thus analyzed to determine the optimal time to switch on the locomotive transformer and prevent the damage to the system.
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