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This paper presents multilevel AC-DC single-phase power conversion cells for applications in which the regenerative operation is either not required or prohibited. The AC primary power source is a single phase from a permanent magnet (PM) generator or from an electrical grid. The cells are composed of two H-bridges in cascade: a unidirectional high-voltage H-bridge with two controlled switches and...
Through their high gain and low saturation voltage, source-gated transistors (SGTs) have applications in both analog and digital thin-film circuits. In this paper, we show how we can design SGT-based logic gates, which are practically unaffected by temperature variations. We discuss design characteristics, which ensure reliable operation in spite of SGT temperature dependence of drain current, and...
The so-called Carrier Ethernet has been a promise to take Ethernet to a new stage, eventually becoming a cost effective alternative to SONET/SDH for carrier-grade transport networks. Although some landmark steps have been made in the last 10 years, Ethernet networks are not yet ready to fulfill that promise. One big issue concerns network survivability and related control functions. This paper discusses...
The simultaneous switching noise (SSN) from single-ended signaling I/O interfaces is significant when there are multiple channels transmitting data in parallel. The memory interfaces use the single-ended signaling scheme where the power delivery noise spectrum may coincide with some critical radio bands or resonance frequencies within the platform depending on the bit pattern being transmitted from...
Polymeric insulators used in 13.8 kV distribution network are presenting premature damage due to cavity inner dielectric. With the objective to develop a diagnostic process, it was constructed an experimental distribution line in Universidade Federal de Pernambuco (UFPE) campus. In this article it will be described this experimental line characteristics and performed studies to plan its construction.
Three terminal measurements on a carbon nanotube field effect transistor (CNTFET) were carried out in high vacuum and the ambient, and its performance compared. The on-off current ratio, ION/IOFF, were 102 and 105 for devices operated in high vacuum and in ambient air, respectively. Here, we show that the conversion of p-type to ambipolar behavior may largely be attributed to the O2 in ambient doping...
The aim of this paper is to revisit the theme of non-resonant electronic ballasts focusing on a specific topology introduced in the last few years. Its complete mathematical analysis, which has not been fully explored in the past, and its practical implementation as a dc-fed electronic ballast unit is provided. The ballast here presented was successfully prototyped and is capable of pre-heating, igniting...
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