摘要:

AbstractThe influence of the finite gain and gain‐bandwidth product of the operational amplifier on the parameters of the active RC filter has been investigated in the present paper. Single amplifier biquad filters were analysed for the case when the central frequency in the pole pair does not depend on the amplifier gain, i.e. whenS kωp= 0. The general results were obtained for such filters, describing well the filter behaviour at low as well as at high frequencies. On the basis of the results obtained, the deviation of the realized parameters from the desired values can be determined, and thereby the necessary correction of the filter calculation can be made. The experimental results agree well with the theoretical

ISSN:0098-9886    

DOI:10.1002/cta.4490080102

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1980

数据来源: WILEY

摘要:

AbstractGeneral conditions for sum and product matrix decomposition are applied to the sum of the chain matrices and the product of the immittance and the hybrid matrices. The corresponding connection of the partial two‐ports is realized by special three‐ports containing operational amplifiers and current and voltage controlled sour

ISSN:0098-9886    

DOI:10.1002/cta.4490080103

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1980

数据来源: WILEY

摘要:

AbstractThe impedance scaling process and Norton's transformation are formulated in a uniform manner as a Cauer‐Howitt transformation with diagonal matrices. For passive two‐element‐kind ladder networks the realizability conditions are reduced to linear inequality constraints. An algorithm is given to enumerate all vertices of the realizability polyhedrons which represent all equivalent networks with a minimum number of elements. In addition a cost function meeting practical requirements is stated and optimized, taking into account various orders of network compl

ISSN:0098-9886    

DOI:10.1002/cta.4490080104

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1980

数据来源: WILEY

摘要:

AbstractA new design formula for the Multiple Frequency Notch Filter is proposed. The filter can be constructed from a finite set of identical linear sections with arbitrary transfer functions. The general transversal structure and the cascade connection of the identical linear section are considered. In contrast to the general structure, there are found three configurations which have only one adjustable element. An example illustrating the use of the proposed technique is included.

ISSN:0098-9886    

DOI:10.1002/cta.4490080105

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1980

数据来源: WILEY

摘要:

AbstractAn operational transconductance amplifier (OTA) and an operational amplifier are being used to synthesize various second‐order cascadable active RC filters. Two of them are active R filters. The filters are studied both theoretically and experimentally and are found to have low sensitivity to variations in their component values. They work satisfactorily in practice, except that some of them have a rather limited dynamic rang

ISSN:0098-9886    

DOI:10.1002/cta.4490080106

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1980

数据来源: WILEY

摘要:

AbstractIn this paper, we present a new transmission line transformer which is capable of matching a load resistanceRLto a given source of internal resistanceRgin a frequency independent manner. This matching can be made perfect at all frequencies ifRL/Rg= 4; forRL/Rg≠ 4, the matching can still be made frequency independent but the power transferred to the load becomes less than the maximum available powe

ISSN:0098-9886    

DOI:10.1002/cta.4490080107

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1980

数据来源: WILEY

摘要:

AbstractThe problem of designing very‐low frequency (VLF) active filters in hybrid‐integrated form is discussed. It is shown that a class of single‐amplifier second‐order filters exists with which VLF active filters can be built while at the same time satisfying the constraints imposed by hybrid‐integrated circuit technology (i.e. limited resistor and capacitor values). However, with decreasing pole frequency, the gain required of the single amplifier becomes excessive, the gain‐sensitivity product (GSP) intolerably high. A solution to the problem is to introduce a second amplifier into the circuit and to distribute the required gain between the two amplifiers. This ‘dual‐amplifier expansion’ (DAX) significantly reduces the GSP, enhances the stability of the filter response, and reduces the susceptibility of the filter characteristics to nonideal amplifier effects. On the other hand DAX may not be arbitrarily introduced into a single‐amplifier circuit without taking the effect of the limited gain‐bandwidth product of the two amplifiers into account. It is shown that the degree by which the gain may be distributed between them is limited by the gain‐bandwidth product ratio of the two amplifiers. Much can be improved in this respect by proper frequency compensation of the two amplifiers. It is shown that a combination of the so‐called T‐compensation and the single‐pole single‐capacitor compensation produces results that are close to those obtainable with ideal ampl

ISSN:0098-9886    

DOI:10.1002/cta.4490080108

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1980

数据来源: WILEY

ISSN:0098-9886    

DOI:10.1002/cta.4490080109

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1980

数据来源: WILEY

摘要:

AbstractThis paper presents a new method for calculating a rational transfer function matrix using a Walsh expansion of the impulse response matrix. The algorithm proposed appears to be computationally convenient owing to certain properties of the Walsh functions. An example is given to illustrate the method.

ISSN:0098-9886    

DOI:10.1002/cta.4490080110

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1980

数据来源: WILEY

ISSN:0098-9886    

DOI:10.1002/cta.4490080111

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1980

数据来源: WILEY