Electronic filter

About: Electronic filter is a research topic. Over the lifetime, 13207 publications have been published within this topic receiving 93063 citations. The topic is also known as: filter.

Reference Voltage Optimization of a Hybrid Filter for Nonlinear Load Compensation

Abstract: The harmonic problem in electric power systems, far from improving, has been increasing in recent years. To mitigate this problem, active filters have been proposed; however, they do not present a complete solution for any type of load and system. This paper develops a control strategy for a compensator based on a hybrid filter topology. This topology is formed by an active power filter of series connection and a passive filter of parallel connection. The proposed strategy is based on minimizing the root-mean-square value of the voltage at the point of common coupling so that the source transfers the power demanded by the load. Thus, the determination of the reference signal is posed as a constrained optimization problem. The strategy was proposed for four- and three-wire systems, and it allowed the compensation of current harmonics and reactive power of harmonic current source and harmonic voltage source loads. An experimental prototype was developed, which has allowed verification of their performance.

Differential Type Class-AB Second-Order Log-Domain Notch Filter

Abstract: In this paper, a new current-mode second-order differential type Class-AB log-domain notch filter is proposed. It is systematically designed using state-space synthesis method. The filter circuit is current-mode, Class-AB and differential type. In the circuit, the input and the output values, and dominant variables are all currents. Input and output currents are also differential signals. Only transistors and grounded capacitors are required to realize the filter circuit. Three cases of the second-order notch filter were obtained. The regular notch was obtained when omegan=omega0, the low-pass notch was obtained when omegan>omega0, and the high-pass notch was obtained when omegan>omega0. The center frequency, the notch frequency, the quality factor, and gain of the filter can be electronically tuned by changing external currents. Time and frequency-domain simulations are performed using PSPICE program for the filter to verify the theory and to show the performance of it. For this purpose, the filter is simulated by using idealized bipolar junction transistor models and AT&T CBIC-R (NR200N-2X NPN), (PR200N-2X PNP) type transistors.

New CMOS fully differential current conveyor and its application in realizing sixth order complex filter

Abstract: A sixth order complex filter based on the usage of a newly proposed fully differential current conveyor (FDCC) is presented in this paper. The FDCC new structure is based on usage of differential difference operational floating amplifier (DDOFA) [1] and floating current source circuits [2]. The block is realized using 0.25µm CMOS technology under ±1.5V power supply. PSPICE simulation for the FDCC is done for testing the block. The simulation shows that the FDCC has ±0.5V input dynamic range, 95MHz 3-dB frequency at output terminal under 10KΩ load and 7.21mW total power dissipation. The FDCC is used to realize first order complex filter with 1 MHz center frequency and second order complex filter at 500 KHz center frequency. Finally; using cascading technique, a sixth order complex filter at 500 KHz center frequency is proposed. The proposed filter is suitable for applications like Bluetooth receivers. All the proposed filter circuits are simulated using ADS simulator.

Low-output and high-input impedance frequency filters using universal voltage conveyor for High-Speed Data Communication Systems

Abstract: Modern network technology puts all the time bigger demands on the properties of continuous-time filters. In particule, wide bandwidth applications are required. We can find new active elements which operate on higher frequencies compared with commonly used active elements in many new applications. These are, for example, current or voltage conveyors. In this paper a new building block of analog circuits, the Universal Voltage Conveyor UVC, is presented. New filter circuits using UVC are designed. The proposed structures embody a high rate of linearity and that is why they are suitable for filters in cable modems.

A 10KV shunt hybrid active filter for a power distribution system

Abstract: This paper analyzes the compensation performance of a shunt hybrid active power filter. The hybrid active power filter, which combines passive filter and active power filter, has both respective merits, and is an important developing trend of filtering device. The hybrid active power filter can reduce the capacity of active power filter effectively and is more suitable for the engineering application for high voltage nonlinear loads. The compensation performance of hybrid active power filter is analyzed by estimating the effect of different active power filter gain and parameters change. Then, a conclusion has been obtained that the harmonic attenuation rate is insensitive to the variation of passive parameters when the active power filter with an enough feedback gain is combined. Finally, the feasibility and validity of proposed scheme is verified by simulation using Matlab and a hybrid shunt active power filter prototype.