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This paper describes an ultralow-power VCSEL transmitter in 32 nm SOI CMOS. To increase its power efficiency, the VCSEL is driven at a low bias current. Driving the VCSEL in this condition increases its inherent nonlinearity. Conventional pre-emphasis techniques cannot compensate for this effect because they have a linear response. To overcome this limitation, a nonlinear equalization scheme is proposed...
Exact simulations of solar cells require an efficient and accurate method able to model the device studied. For the case of the model single-diode/two resistors, five parameters must be identified the photo-generated current Iph, the reverse saturation current I0, the shunt resistance Rp, the series resistance Rs and the curve fitting parameter a (the ideality factor). This paper outlines a simple...
Photo-voltaic generators are no longer an energy source mainly useful for off-grid applications, such as satellites. Their presence in the energy mix of developed countries has substantially increased. Moreover, their price downward trend, together with the upward trend of electric energy prices, might increase their role, if allowed by the legal context. The behavior of photo-voltaic generators is...
Electrical arcs are of great concern for power electronic systems. Modeling of arc faults to represent and predict arc characteristics and transient responses within the power system is now receiving considerable research attention. In this paper, a series DC arc fault demonstration rig is designed to generate series arcs by moving one electrode away from a stationary one with a stepper motor. Experimental...
The new LV8900 900 V variable speed drive range from Converteam utilises 3-level NPC inverter topology, featuring multi-layer laminated busbars. These laminates contribute to the commutating stray inductances, and laminate resistive losses in high current and high switching frequency applications are affected by the skin effect. This paper describes models implemented in FastHenry and Simulink accounting...
Different models have been proposed for modeling the IV-characteristics of diodes. In this paper we present a simple model, which describes both the IV- and the temperature characteristics of a SOI-pin-diode and can be used for different diodes types. It is well known that the DC-characteristics of a diode can be approximated by the simple Shockley-equation. However, when a more exact modelling of...
An electrical resistance tomography sensor consists of a set of measurement electrodes. In general, finite element method (FEM) is used to solve the forward problem (i.e. calculate the resistance value for a given conductivity distribution and electrodes setup). In this paper, a new approach is proposed. The equivalent resistor network model of an electrical resistance tomography (ERT) sensor has...
The main goal of this paper is to establish a link between the ultracapacitors impedance at low frequency and slow phenomena such as self-discharge and charge recovery. Usually these phenomena are studied in the time domain. However, additional information can be extracted from specific characterization methods in the frequency domain like impedance spectroscopy. In this way, we intend to introduce...
Many electronic circuits and systems operating at low voltages are battery-powered. As a linear voltage regulator is used to this end, it has to be characterized by a high power efficiency, which can be achieved by a low voltage drop (LDO) across a pass element. In this paper a d.c. model of the voltage regulator LDO REG 104-5 V is presented. The theoretical considerations are illustrated by the results...
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