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.

New design of compact dual band-notch ultra-wideband bandpass filter based on coupled wave canceller inverted T-shaped stubs

Abstract: The procedure of attaining a compact bandpass filter (BPF) with dual band-notch function for ultra-wideband (UWB) applications is presented and discussed. In the proposed BPF, defected ground structure is used in order to improve the out-of-band performance of the filter. Also, four short-circuited bent stubs are employed in order to improve the selectivity of the filter at its cutoff frequencies. Dual band-notch function is added to the performance of the filter by coupling two short-circuited inverted T-shaped stubs to the filter main resonator. The fabricated filter satisfies well the demands of the Federal Communications Committee with two narrow band-notch functions at 5.5 and 8 GHz, which eliminates the interference of the UWB system with wireless local area network (WLAN) and satellite communication systems, respectively. The improved upper stop-band of the proposed filter with more than 20 dB attenuation level extends up to 20 GHz.

New Universal Filter with One Input and Five Outputs Using Current-Feedback Amplifiers

Abstract: A new universal voltage-mode second-order filter circuit is presented. The circuit uses five current-feedback operational amplifiers, two grounded capacitors three grounded resistors and three floating resistors. The circuit can realize all the standard filter functions; lowpass, highpass, bandpass, notch and allpass, without changing the passive elements. The proposed circuit enjoys independent grounded-resistance-control of the natural frequency and the bandwidth, low output impedances, high input impedance as well as low active and passive sensitivities.

Flicker filter circuit

Abstract: Briefly, in accordance with one embodiment of the invention, an integrated circuit includes: a flicker filter circuit. The flicker filter circuit has a configuration so that during filter operation two line buffers are employed to store partial sums of the filtered input digital signal samples. Briefly, in accordance with another embodiment of the invention, an integrated circuit includes: three line buffers, three multipliers, and three adders. The buffers, multipliers and adders are coupled in a circuit configuration so as to implement a flicker filter during circuit operation.

Simplified control strategy for hybrid active filters

Abstract: Nowadays, hybrid filtering is an important alternative to improve line performance when supplying high-power nonlinear loads. This paper presents a simple and low cost control strategy for hybrid filter as an alternative to other more complex algorithms, in some specific applications. The proposed control strategy is recommended for a utility interface with three-phase diode bridge rectifier front-end due to its high displacement power factor. It has been tested by simulations (both steady-state and transient analysis) and by experimental verification, where good results are obtained. It can be seen that using this control strategy, acceptable harmonic levels according to IEEE-519 standard are obtained. Also a different connection of the passive filter is experimentally verified, allowing the reduction of passive filter capacitors.

Sound reproduction device

Abstract: A sound reproducing device particularly adapted for use in the passenger compartment of an automobile and having improved stereo separation and symmetrical frequency characteristics. The device includes a high-pass filter circuit for passing, when a leakage signal occurs, a signal of equal frequency component to the leakage signal, an attenuation circuit for attenuating the level of the signal passed through the filter circuit to the level of the leakage signal, and a phase inverting circuit for inverting the phase of the signal thus attenuated so as to be opposite to that of the leakage signal, thereby to cancel out the leakage signal.