摘要:

Parallel connection of coupled-resonator piezoelectric filters of different frequencies can provide increased bandwidth without additional insertion loss, at the expense of extra coupled resonators. A theory of two such methods of connection is presented, for two biquartic filters placed in parallel, with and without phase inversion before interconnection. Standard amplitude responses may be obtained from both methods; with phase inversion, standard amplitude and phase responses based on a third order, all-pole prototype can be obtained with bandwidth increases of up to 50%; without phase inversion, standard amplitude response based on a second-order prototype may be obtained with bandwidth increases of up to 100%.

DOI:10.1049/ip-g-1.1980.0037

出版商:IEE    

年代:1980

数据来源: IET

摘要:

A fast procedure is given for decomposing networks in minimally interconnected subnetworks. A minimal subnetwork is a group of components and electrical nodes for which there is no other subgroup having less terminals than the subnetwork. The procedure uses a property of 0-minimal subnetworks, which reduces considerably the computation time for obtaining the minimally interconnected subnetworks; a 0-minimal subnetwork is one in which there exists at least one subgroup with the same number of terminals as the subnetwork, and there is no such subgroup with less terminals than the subnetwork. The procedure is compared with a previously published technique.

DOI:10.1049/ip-g-1.1980.0038

出版商:IEE    

年代:1980

数据来源: IET

摘要:

The purpose of this paper is to apply a recent minimax optimisation algorithm to the design of equalised recursive digital filters satisfying prescribed amplitude specifications. The technique is applied to the design of a lowpass, a highpass and a bandpass filter.

DOI:10.1049/ip-g-1.1980.0039

出版商:IEE    

年代:1980

数据来源: IET

摘要:

In this paper, the indefinite admittance matrix (i.a.m.) method for the analysis of switched-capacitor (s.c.) networks1will be expanded for the analysis of multiphase switched-capacitor (m.s.c.) networks. Such networks comprise active gain elements, capacitors, and switches operated by an arbitrary number of nonoverlapping clockphases. Included as part of this analysis is the derivation of an equivalent-circuit representation of m.s.c. networks which is compatible with classical-circuit theoretical considerations. The analysis method lends itself well to computer processing. A computer algorithm and examples of the proposed method are given.

DOI:10.1049/ip-g-1.1980.0040

出版商:IEE    

年代:1980

数据来源: IET

摘要:

An lpoptimisation procedure is suggested for the design of activeURCfilters, approximating specified magnitude and linear-phase characteristics. The performance measure is a function of the magnitude error, phase error and the magnitude sensitivity with respect to the coefficients of the transfer function. The proposed technique has the advantage of controlling the sensitivity of a realisable transfer function without limiting the design to a specific circuit configuration. It does not require the assumption that a lumped solution to the problem is available as is the case in most previous design procedures. The technique is illustrated by a design example.

DOI:10.1049/ip-g-1.1980.0041

出版商:IEE    

年代:1980

数据来源: IET

摘要:

A nonlinear transformation convertor is first defined. The new circuit element is shown to be useful for realising one-port andn-port resistors by combining piecewise-linear and rational function approximation techniques. Circuit implementations for the new convertor are proposed, and their experimental verification is shown to be in agreement with theoretical predictions.Se define un convertidor de transformatión no lineal. Se demuestra la utilidad del nuevo elemento de circuito para realizer resistencias monopuertas yn-puertas combinando técnicas de approximación por funciones lineales a tramos y por funciones racionales. Se proponen asimismo implementaciones para el nuevo convertidor y se demuestra que su comportamiento experimental concuerda con las predicciones teóricas.

DOI:10.1049/ip-g-1.1980.0042

出版商:IEE    

年代:1980

数据来源: IET