One of the most important requirements that RF and microwave power amplifiers designed for radiocommunication systems must meet is an optimum power added efficiency (PAE) or an optimal combination of PAE and linearity. A harmonic active load–pull system which allows the control of the first three harmonic frequencies of the signal coming out of the transistor under test is a very useful tool to...

When a layer of a semicrystalline polymer is subject to a tensile force in its plane and a voltage through its thickness, the deformation of the layer is initially homogeneous, but it then localizes. The electromechanical instability sets in when the force and the voltage reach critical conditions. The critical conditions are determined in this paper and are related to the following two special...

A very simple circuit design of a bidirectional input/output(I/O) buffer is proposed for mixed voltage interface applications. By a floating N-well circuit technique two series PMOS transistors are used as an active pull-up driver. Such a structure provides a simple circuit that requires only a single terminal pad, a single power supply, and is free of DC leakage current. Mixed voltage interfac...

We have simultaneously fabricated RF power LDMOSFETs on thin-film SOI and bulk silicon wafers. This work compares their DC current–voltage ( – ), capacitance–voltage ( – ), -parameter, and 1.9-GHz load-pull characteristics and explains differences between them. The SOI LDMOSFET performance is shown to be largely similar to the performance of an equivalent bulk silicon LDMOSFET, but there are im...

This paper represents a comparative study of isolated resonant topologies for photovoltaic application such as half bridge, full bridge and push pull topology. The performance of these topologies is analyzed with the help of Pulse Width Modulation (PWM) technique. The stressful behavior of the switches is reduced by soft switching technique. So, the primary side switches utilize zero voltage sw...

In this paper, the dynamic characteristics of clamped-clamped silicon microbeam subjected to electrostatic excitation and mechanical shock is investigated. The Euler-Bernoulli beam model based on the modified couple stress theory with von Kármán geometric non-linearity is utilized in theoretical formulation. Afterwards, squeeze-film damping effects of microstructures for small amplitude vibrati...

This article studied static deflection, natural frequency and nonlinear vibration of a clamped-clamped microbeam under discontinues electrostatic actuation. The electrostatic actuation was induced by applying AC-DC voltage between the microbeam and electrode plate. In contrast to previous works, it was assumed that length of the electrode plate was smaller than that of the microbeam. In additio...

This paper presents the analysis of a water pumping system from photovoltaic cells using a currentfed parallel resonant push-pull inverter, for residential applications in rural areas. The structure of the power circuit is particularly simple and robust. It works in a ZVS commutation. Its main features are: one power processing stage, simple control strategy, low harmonic distortion of the load...