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Chopping is a commonly used technique to eliminate flicker noise in amplifiers. We investigate the use of chopping in the input integrator of a continuous-time oversampling ($\Delta \!\Sigma $ ) converter. Unlike an amplifier, the integrator in a continuous-time delta-sigma modulator is subject to out-of-band signals that are several orders of magnitude higher than the (desired) in-band component...
The paper proposes an original DC-AC inverter that is based on combination of buck converter with standard three-level H-bridge inverter. This inverter uses simple feed-forward control in order to obtain almost sinusoidal output currents and voltages.
This paper presents a characteristic comparison among reduced semiconductor equivalents of dual back-to-back converter. Being widely reported, the nine-switch and ten-switch based converters are considered for the comparative analysis. Conduction losses of both these converters are compared to identify the merits and drawbacks as they are used in dc-ac, ac-dc, dc-dc or ac-ac energy conversion systems...
The paper presents an analysis of multilevel inverter, which comprised of cascaded 5-level Flying Capacitor (FC) cell and standard 3-level H-bridge cells. The advantages of the proposed inverter upon standard topologies are significant reduction of electrical components and as a result, lower size and weight. Moreover, the proposed inverter has simplified control algorithm due to the reduction of...
The paper presents an analysis of a novel 13-level inverter, which consists of three cascaded H-bridges per phase. Each H-bridge produces 5-level voltages. The proposed topology has only two bi-directional and four standard IGBT switches in each 5-level H-bridge. The significant advantages of the proposed inverter are simpler control and lower number of switches than in the standard neutral point...
Due to voltage limitation of available semiconductor switches, multicell converters are required for high-power medium-voltage applications. One of the most significant types of multicell converters is cascade multicell converter categorized into symmetrical and asymmetrical ones. This paper first presents a new symmetrical cascade multicell converter in which the number of switches is optimized....
A low noise interface circuit of MEMS sensor system for ultra-low frequency signal is presented in this paper. The interface circuit in CMOS processes uses chopper technique which greatly reduces 1/f noise and offset voltage of small signal processing circuit. The circuit that has a gain of 63 is fabricated in 0.5um 2P3M CMOS process. The equivalent input noise caused by clock through and charge injection...
Assuming that STATCOM has no active power losses, the current and voltage analytical expressions of the three-level and dual three-point STATCOMs under the fundamental frequency modulation (FFM) control are presented by means of the theoretical analysis method. Meanwhile, the current and voltage waveforms of two STATCOMs are simulated with the help of Matlab/Simulink. The good agreement between theoretical...
This paper studies the impact of dielectric relaxation on SigmaDelta-modulators. Unlike the impact on SAR and pipeline ADCs, there seems to be no research reporting on the impact of the phenomenon on SigmaDelta-modulators. Nevertheless, the SC-integrators used in the circuit implementation of SigmaDelta-modulators too rely on the transfer of charge from one capacitor to another. So, there could be...
Class D amplifiers are becoming the most feasible solution for embedded audio application. However, distortions due to the non-linear nature of switching stage are the main drawback for this amplifier topology. This paper discusses the design and implementation of high fidelity audio class D using sliding mode control scheme. This design method proves to be a cost effective solution for industrial...
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