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.

Multi-resonance circuit suitable for LED multi-path precise constant current driver

Abstract: The invention discloses a multi-resonance circuit suitable for an LED multi-path precise constant current driver. The multi-resonance circuit comprises a high-frequency pulse AC source, an impedance network, a resonance capacitor, a high-frequency transformer, two-path rectifying filter circuits and two-path LED loads, wherein the high-frequency resonance capacitor and the impedance network form a high-frequency resonance network which participates in the resonant transformation of a main circuit and has a blocking function, namely, balancing the voltage differences of the two-path LED loads to equalize the average current flowing through the two-path LED loads; and under an ideal condition, when the voltage drop of the two-path LED loads are completely equal, the voltages at the two endsof the resonance capacitor are zero. The multi-resonance circuit has the advantages of: 1, achievement of equalizing current among the multi-path LED loads through a primary converting circuit, low cost, no need of additional control circuits, and high reliability; 2, high precision of equalizing current, and insusceptibility to the voltage differences of the two-path LED loads; 3, high efficiency of the achievement of the equalizing current through a blocking capacitor, and little loss in the achievement of the equalizing current even if the voltage differences of the two-path LED loads are large.

The measurement of the intensity ratios of spectral lines with electron multiplier photo-tubes.

Abstract: Some properties of electron multiplier photo-tubes are investigated The use of these tubes in quantitative spectrographic analysis is discussed, and a scheme for reducing the effect of the dark current is described A sharply tuned electronic filter passing only the 120-cycle component of the signal is used to increase the signal to noise ratio An amplifier circuit for measuring the intensity ratios of spectral lines is shown, and results from the application of this circuit to the analysis of chromium in steel are tabulated

Electrical filter arrangement

Abstract: This invention relates to a highly selective electrical filter network composed of passive circuit elements and capable of attenuating or ''''notching'''' only selected frequencies from a band while freely passing without substantial attenuation the remaining frequencies in the band. Such a filter network comprises a plurality of series and parallel LC resonant networks or stages alternately disposed in circuit relationship with one another and designed to resonate at the ''''notching'''' frequency. The stages are interconnected by means of suitable matching transformers to permit the optimum use of the inherent Q of each inductor.

Bucket-Brigade Transversal Filters

Abstract: The bucket-brigade delay line (BBDL) is a sampled data circuit in which signal samples are stored and manipulated as packets of charge under the control of a digitally generated clock. The clock-controllable time delay function that is realized by the BBDL may be used to implement a number of signal processing functions. The tapped delay line or transversal filter structure is of particular interest, however, since it has wide application in the field of signal processing. The implementation of transversal filters via BBDL's is examined. The impact of nonideal delay line parameters on filter performance is considered and the results of computer simulations are presented. The practicability of monolithic transversal filters is demonstrated and the performance of experimental filters is described.

Microwave active filter using GaAs monolithic floating active inductor

Abstract: A broadband tunable microwave floating active inductor is proposed. Its application in the microwave active filter is presented. The design technique is to replace the passive inductor in the conventional LC ladder filter by the proposed floating active inductor. These active filters can, therefore, be implemented in full MMIC form. © 1992 John Wiley & Sons, Inc.