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In this paper, the active capacitor is proposed to replace the electrolytic capacitor of the power factor correction (PFC) converter. Conventionally, a bulky electrolytic capacitor is connected in parallel with the output stage of the PFC converter to reduce the output ripple voltage. However, the electrolytic capacitor would shorten the lifetime and reduce the reliability of the PFC converter. Thus,...
This paper proposes a stepping on-time adjustment (SOTA) control method with status judgment for multichannel interleaving critical mode (CRM) boost PFC converter. The interleaved control is a trend for high power applications. However, conventional interleaved methods are complicated to implement when more than two channels are required. The SOTA method with status judgment is proposed to simplify...
Metal-oxide-semiconductor (MOS) capacitors with atomic-layer-deposition (ALD) HfLaO or HfZrLaO high-κ gate dielectrics have been fabricated, and the reliability of time-dependent-dielectric-breakdown (TDDB) characteristics have also been analyzed. HfZrLaO shows a better performance in comparison with HfLaO. Moreover, some important parameters for HfZrLaO and HfLaO gate dielectrics are compared in...
In recent years Operational Transconductance Amplifier based high frequency integrated circuits, filters and systems have been widely investigated. The usefulness of OTAs over conventional OP-Amps in the design of both first order and second order active filters are well documented. This paper proposes two first order voltage controlled all pass filters with phase tuning capability. Simulation results...
A TDDB reliability experiment was performed on interdigitated comb structures with intentionally severe line-edge roughness and the results were then compared to a simple theoretical model. It is seen that for the case studied, the predictions of the model do not compare well to the experimental data, but that for some observed cases the effect of reducing spacing between lines is so strong that more...
This paper discusses the design of a miniaturised frequency selective surface (FSS). The FSS uses lumped inductors and capacitors in conjunction with a triangular metallic structure. Simulations of the important design variables are presented and a unit cell size of lambda/18 is proposed. Measurements in a waveguide simulator validate the performance.
A novel planar bandpass lump-loaded Frequency selective surface (FSS) is presented. Based on the artificial transmission line current loop realized by the lumped loaded elements, this novel bandpass FSS has overcome the traditional resonant type FSS limitation of the mutual dependence between the dimensions and bandwidth. A lumped-loaded band pass FSS whose unit cell is only lambda/20 with 18.6% bandwidth...
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