An operational amplifier circulator based on the weighted summer

Atiya, F.S.

doi:10.1109/tcs.1975.1084075

Cited by 5 publications

(3 citation statements)

References 5 publications

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“…Three port type-B circulator using three op amps. 4 Following the design given in Ref. 4 by taking R 1 = R 2 and much larger than R O and the Z-matrix is obtained as given below:…”

Section: Type B-circulatorsmentioning

confidence: 99%

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Active Circulator Circuits Using Oa, Ccii, Cfoa and DVCC

Soliman

2009

J CIRCUIT SYST COMP

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A review of the two types of circulators using Operational Amplifiers (OA) with detailed comparison is given. Novel active circulator circuits using Current Conveyors (CCII) and Current Feedback Operational Amplifiers (CFOA) and Differential Voltage Current Conveyor (DVCC) are introduced. The proposed CCII circulator circuit uses six CCIIs and three floating resistors. Two different circulator types using the CFOA are given. A circulator circuit which uses three DVCCs and has the advantage of using three grounded resistors is also introduced.Spice simulation results using 0.5 µm CMOS transistors are included to support the theoretical analysis and demonstrate comparisons among the different types of circulators.

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“…Three port type-B circulator using three op amps. 4 Following the design given in Ref. 4 by taking R 1 = R 2 and much larger than R O and the Z-matrix is obtained as given below:…”

Section: Type B-circulatorsmentioning

confidence: 99%

“…1 Several circuits have been suggested for the realization of active circulator using operational amplifiers (op amp). [1][2][3][4][5] There are two basic circulator types defined in this paper as types A and B. An alternative approach in realizing active circulators is to use the nonreciprocal behavior of transistors.…”

Section: Introductionmentioning

confidence: 99%

Active Circulator Circuits Using Oa, Ccii, Cfoa and DVCC

Soliman

2009

J CIRCUIT SYST COMP

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“…Junto com o seu estudo, foi levantada uma questão de grande importância no desenvolvimento de circuladores: a influência da variação da impedância de carga no desempenho desses circuitos. van der Puije (1971) estava elaborando um estudo de aplicações em linhas telefônicas e se deparou com o problema da grande variação de impedância das linhas de transmissão de sinais, que apresentam uma grande variação de distância de acordo com as regiões conectadas.Ainda na década de 1970,Atiya (1975) obteve avanços na análise de sensibilidade do circuito quanto à variação de certos componentes e propôs alguns métodos de compensação com a inserção de impedâncias variáveis. Também previu um ganho de desempenho com amplificadores de alta frequência de operação e destacou novos usos dos circuladores, como repetidores de duas vias, conectores de filtros em sistemas multiplex e em projetos de giradores.Além disso,Park (1975) desenvolveu uma variação de circuladores ativos para operarem com alto ganho, destinado à aplicação em repetidores.Os avanços ocorridos na década de 1980 foram no sentido de aumentar a frequência de operação dos circuladores baseados em transistores Naito et al (1980).…”

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Projeto e análise de aplicações de circuladores ativos para a operação em frequências de ultrassom Doppler de ondas contínuas

Santini¹

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A new generalized inverter based on the active hybrid

Atiya

Doss

1977

Circuit Theory & Apps

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SUMMARYThe building block for the new generalized immittance inverter is a 3-port known as the active hybrid network. One of its ports is bidirectional, and matches a design admittance yo. The second port operates in the send, while the third port operates in the receive direction. The hybrid is constructed from an op-amp and a 5-port network composed of a few resistors and the design admittance yo. There are two versions of the hybrid: the voltage-inverting (i.h.) and the noninverting hybrid (n.i.h.).The inverter consists of an i.h. and an n.i.h. connected at their unidirectional ports in a loop. The gyration admittances are actual driving-point admittances in the circuit, namely the design admittances yo, y b of the two hybrids. Such an inverter, when terminated at its output port by a load admittance y, will give at its input port an input admittance Expressions are derived for the y parameters of the inverter at higher frequencies, thus accounting for the finite bandwidth of the op-amp.Two special cases are particularly treated, and experimental results are obtained for them. The first is the case of the resistive gyrator, for which yo and y b are pure conductances. The second is the case of the capacitive gyrator, for which yo and yb are pure capacitive susceptances. The capacitive gyrator is used to produce the supercapacitor, or f.d.n.r., and the results of measurements on a number of f.d.n.r. networks are given.

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An operational amplifier circulator based on the weighted summer

Cited by 5 publications

References 5 publications

Active Circulator Circuits Using Oa, Ccii, Cfoa and DVCC

Active Circulator Circuits Using Oa, Ccii, Cfoa and DVCC

Projeto e análise de aplicações de circuladores ativos para a operação em frequências de ultrassom Doppler de ondas contínuas

A new generalized inverter based on the active hybrid

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