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.

Planning Approaches for the Strategic Placement of Passive Harmonic Filters in Radial Distribution Networks

Abstract: This paper presents an approach to determine strategic buses for harmonic filter placement by correlating the sensitivity index based on the inherent structure theory network (ISTN) and harmonic current injection at buses of the distribution network/feeder. The strategic buses for the harmonic filter are characterized as either the bus with maximum total harmonic voltage distortion (THDV) in a distribution feeder, or the bus where the placement of the harmonic filter would result in maximum reduction in the overall average THDV in the distribution feeder. The advantage of using this approach is that it provides insight into the interaction of the network structure with harmonic current sources in the distribution network in regards to the performance of harmonic filters. The assessment of the performance of a strategically placed passive harmonic filter based on the proposed approach is evaluated for peak and offpeak load scenarios on a radial distribution network. The results indicate that passive harmonic filters that are placed based on harmonic current emission levels perform better than harmonic filters placed based on ISTN alone. The strategically placed passive harmonic filters are highly effective in controlling harmonic propagation in distribution networks

The design and operation of practical charge-transfer transversal filters

Abstract: Some of the design considerations for charge-transfer split-electrode transversal filters are discussed. Clock frequency, filter length, and chip area are important design parameters. The relationship of these parameters to filter performance and accuracy is described. Both random and tap weight quantization errors are considered, and the optimum filter length is related to tap weight error. A parallel charge-transfer channel, which balances both capacitance and background charge, and a coupling diffusion between split electrodes greatly improves accuracy. A one-phase clock is used to simplify the readout circuitry. Two off-chip readout circuits are described, and the performance of two low-pass filters using these readout circuits is given. Signal to noise ratios of 90 dB/kHz and an overall linearity of 60 dB have been achieved with this readout circuitry.

Active filters for 1 MHz power circuits with strict input/output ripple requirements

Abstract: As the switching frequency of a dc-dc converter is raised from 100 kHz to 1 MHz, one would expect the energy storage elements of the circuit to be correspondingly reduced in size. If the circuit must meet input and output ripple requirements of the nature of MIL-STD-461B CEO3, however, the advantage of a higher switching frequency is significantly offset by the higher filter attenuation levels required. This paper discusses the use of active filters, in conjunction with minimal passive filters, to achieve the required ripple levels with a much smaller overall volume. Working active filters with gains in excess of 100 at 1 MHz are also presented.

RF transversal filter using an AOTF

Abstract: An acoustooptic tunable filter (AOTF) is employed in an optical system to obtain an independently tunable and reconfigurable radio-frequency transversal filter. Manipulating only the control signals of the AOTF modifies the transfer function of the filter. This letter demonstrates the experimental implementation of a two-tap version of the proposed filter. Avenues for increasing the number of taps are discussed.

New universal filter using two current-feedback amplifiers

Abstract: A new universal voltage-mode second-order filter circuit is presented. The circuit has three inputs and one-low-impedance output and can realize all the standard filter functions; lowpass, highpass, bandpass, notch and allpass, without changing the passive elements. The proposed circuit uses only five passive components and enjoys independent control of the natural frequency and the bandwidth, and orthogonal control of the natural frequency and the quality factor as well as low active and passive sensitivities.