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.

Active And Passive Analog Filter Design

Abstract: active high pass filter op amp high pass filterbasic, design parameters of an anti aliasing filter in this sec tion aliasing theory will be discussed this will be fol lowed by operational amplifier filter circuits examples of active and passive low pass filters will also be dis cussed finally a 12 bit circuit design example will be given all of the active analog filters discussed in this, p bruschi analog filter design 10 passive network includes only passive components resistors capacitors inductors transformers when connected to external independent sources the net energy flux into the network is always positive passive network active network, filters active amp passive introduction filters pervade electronic design as there is always a need to shape the frequency response of signals propagating through the system of interest to achieve the correct shaping one considers the fourier transform of the filter and designs it so that the magnitude of this transform has the desired shape in, we can also divide filters by the singal processing method analog filters work on real continuous signals and digital filters work on sampled quantitized filtres analog filters can be passive consisting of passive elements only resistors capacitors and coils

Reconfigurable baseband filter

Abstract: A reconfigurable baseband filter for use in a multimode communication system is disclosed. One or more filter elements (260), (270) can each be configured as a plurality of sub-elements (262, 264), (272, 274). The value of each of the filter elements can be varied by switching between at least two of the plurality of sub-elements. Switching noise within a desired passband can be reduced by switching at a rate that is greater than the desired passband. The switching noise in the passband can be further reduced by pseudo-randomly switching between the sub-elements. The filter can use a delta-sigma modulator to generate a pseudo-random switching signal.

An Algorithm for High-Speed Digital Filters

Abstract: This paper describes an algorithm that is suitable for fast implementations of nonrecursive and recursive digital filters. High speed is realized at the expense of memory; however, the memory-speed tradeoff is flexible so that many hardware and software implementations are practical. When memory is not limited, the time required to compute a filter output value is independent of the order of the filter.

Sub-octave-tunable microstrip notch filter

Abstract: A frequency-agile narrowband microstrip bandstop filter technology able to maintain near constant absolute bandwidth while tuning over a frequency range of nearly an octave is described. The technology is demonstrated by a reconfigurable notch filter designed to selectively remove unwanted spectral content prior to final amplification in a transmitter's output module. The six-resonator planar microstrip notch filter uses hyperabrupt GaAs varactor diodes to tune the operating frequency over a 92% range, from 480 MHz to 925 MHz. The filter maintains 3MHz-wide stopband attenuation of 34dB to 64dB, absolute 3dB bandwidth of less than 84 MHz, 3dB bandwidth variation of less than 24%, and low stopband reflection over the full tuning range.