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.

The frequency transformation by matrix operation and its application in IIR filters design

Abstract: It is known that the transfer function H(z) of the desired digital infinite-impulse response filter can be obtained from the normalized transfer function H/sub a/(s) of the analog low-pass filter. Recently it has been shown that Pascal matrix allows the appropriate transformation for design of the low-pass, high-pass, and bandpass digital filters. Unfortunately, this method is difficult to use in case of transforming H/sub a/(s) to the high-order bandpass filter. This letter proposes a similar method, especially suitable for design of the bandpass and bandstop filters without order limitation. The presented design algorithm is illustrated by a numerical example.

Generalized Design Method for Voltage- Controlled Current-Mode Multifunction Filters

Abstract: In the article, the Generalized Current Follower Transconductance Amplifier (GCFTA) element for generalized frequency filter design and a novel active element, the Programmable Current Amplifier (PCA) for the realization of the current-mode analog blocks, are presented. The paper is also presenting a method of general frequency filter design, whereas the basic circuit is a general autonomous circuit using GCFTA, PCA elements and general admittances. The properties of the proposed filter were verified using PSPICE simulations. OR design of frequency filters a number of methods can be used. The adjoint transformation (1), method of higher-order synthetic elements (2), transformation using a passive prototypes (3) or design using M-C (Mason- Coates) signal-flow graph method (4) can be introduced as examples. In our workplace, the method of generalized frequency filter design, when the initial circuit is a general autonomous circuit, was developed (5), (6). The same procedure was used in the presented case of GCFTA and PCA elements. The goal of this work is: • definition of the Generalized Current Follower Transconductance Amplifier (GCFTA) element for general frequency filter design working in current mode, • presentation of a novel second-order multifunction frequency filter structure using active elements CFTA+/-, PCA and passive elements, whereas independent control of characteristic or cut-off frequency ω0 and the quality factor Q of other parameters of the frequency filter is enabled,

A 10KV shunt hybrid active filter for a power distribution system

Abstract: This paper analyzes the compensation performance of a shunt hybrid active power filter. The hybrid active power filter, which combines passive filter and active power filter, has both respective merits, and is an important developing trend of filtering device. The hybrid active power filter can reduce the capacity of active power filter effectively and is more suitable for the engineering application for high voltage nonlinear loads. The compensation performance of hybrid active power filter is analyzed by estimating the effect of different active power filter gain and parameters change. Then, a conclusion has been obtained that the harmonic attenuation rate is insensitive to the variation of passive parameters when the active power filter with an enough feedback gain is combined. Finally, the feasibility and validity of proposed scheme is verified by simulation using Matlab and a hybrid shunt active power filter prototype.

Design E-Plane Bandpass Filter Based on EM-ANN Model

Abstract: A novel design method has been developed for E-plane bandpass filter synthesis based on an electromagnetic artificial neural network (EM-ANN) model. EM-software analysis is employed to characterize an E-plane strip. The EM-ANN model is then designed by exchanging the EM-software input/output. The filter is designed without finding the physical parameters by solving equation. A W-band E-plane bandpass filter is designed by this method, the insertion loss of which is less than 1.5 dB, and the center frequency is 94 GHz with a bandwidth of 4 GHz.