Voltage-controlled filter

About: Voltage-controlled filter is a research topic. Over the lifetime, 5514 publications have been published within this topic receiving 70872 citations. The topic is also known as: VCF.

Non-recursive digital filter employing simple coefficients

Abstract: A non-recursive digital filter is disclosed, composed of a cascaded plurality of basic sections, each of which is characterized by coefficient values of integer powers of two's. No hardware multipliers are required in the filter and the operating speed is several times faster than other filters which utilize multipliers.

Model based optimization of EMC input filters

Abstract: Input filters of power converters for compliance with regulatory electromagnetic compatibility (EMC) standards are often over-dimensioned in practice due to a non-optimal selection of number of filter stages and/or the lack of solid volumetric models of the inductor cores. This paper presents a systematic filter design approach based on a specific filter attenuation requirement and volumetric component parameters. It is shown that a minimal volume can be found for a certain optimal number of filter stages for both the differential mode (DM) and common mode (CM) filter. The considerations are carried out exemplarily for an EMC input filter of a single-phase power converter for the power levels of 100 W, 300 W, and 500 W.

Speed control in direct drive with non-stiff load

Abstract: In this paper several digital filters are considered to handle resonance modes in direct drive servo-mechanical systems. Comparisons are made between the Chebyshev low pass filter, notch filter and bi-quad filter. The effectiveness of the presented methods is verified by simulation and in the laboratory.

Switchable bandpass filter with two-state frequency responses

Abstract: A novel switchable bandpass filter with two-state frequency responses is presented, where dual-band bandpass and single bandpass characteristics can be conveniently switched by turning pin diodes on and off. The switchability results from the effect of different working modes. The filter can work as a dual-band bandpass filter obtaining two centre frequencies, 1.8 and 3.5 GHz, which could be appropriately used for GSM and WiMax systems. In the meantime, it also can operate only at 3.5 GHz, rejecting signal at 1.8 GHz. The proposed filter consists of two dual-mode resonators, using pin diodes to switch the frequency responses. An experiment was carried out to validate the design concept, and the measured results agree well with simulated results.

A Modified CDTA (MCDTA) and Its Applications: Designing Current-Mode Sixth-Order Elliptic Band-Pass Filter

Abstract: This paper presents a modified current differencing transconductance amplifier (MCDTA) and the MCDTA based KHN filter with high output impedance. Moreover, the paper gives a current-mode sixth-order elliptic band-pass filter by means of cascade method. The filter with only three MCDTAs, six grounded capacitors and four resistors is easy to be integrated. Its pole frequency can be determined electronically through adjusting bias currents of MCDTA. The results of circuit simulations are in agreement with the designed parameters.