Design Principles for Single Loop Transistor Feedback Amplifiers

Blecher, F.

doi:10.1109/tct.1957.1086369

Cited by 24 publications

(9 citation statements)

References 7 publications

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“…Para un concepto clásico como el de la realimentación, referencias también clásicas resulta una excelente fuente de información, por ende para presentar las ideas iniciales, se utilizará la notación clásica de los primeros trabajos realizados por los pioneros en este tema, tales como Black, Blackmann, Terman, Bode, entre otros [24][25][26][27] [28]. Conceptualmente, los amplificadores realimentados son muy simples.…”

Section: Realimentación Negativa Convencionalunclassified

Realimentación Negativa AS: Una Aproximación a la Realimentación Negativa sin Reducción de Ganancia

García

2013

prospect

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RESUMENEl presente artículo es una reflexión sobre la realimentación negativa. La realimentación negativa es un clásico e importante concepto de la ingeniería electrónica que tiene un significativo número de aplicaciones, siendo una de las principales su uso en el diseño de amplificadores. La realimentación negativa ofrece múltiples ventajas, tales como el incremento del ancho de banda, reducción de la distorsión armónica, insensibilización de la ganancia del amplificador de los parámetros de los componentes activos, entre otras. Todas estas mejoras en el desempeño de los amplificadores se alcanzan al costo de ver reducida la ganancia del mismo, situación que puede ser conveniente en algunos casos, pero no en otros. Por lo anterior, en este artículo se propone una nueva forma de realimentación negativa de lazo simple con la que se tiene todas las ventajas antes mencionadas, con la novedad de no penalizar la ganancia del amplificador. Por tanto, se llevan a cabo unos desarrollos teóricos que luego son verificados con simulaciones en el software de aplicación Multisim® de National Instruments con el objeto de mostrar el funcionamiento de la aproximación propuesta en esta investigación. ABSTRACTThis article is a reflexion about the negative feedback. The negative feedback is a classic and important concept for the electronic engineering and it has a significant number of applications, the main one is used in the amplifier design. Negative feedback offers many advantages, such as increasing bandwidth, reduction of the harmonic distortion, desensitization of the amplifier gain parameters of the active components, among others. The performance improvements are achieved once you can see a gain reduction, a situation that may be desirable in some cases but not in others. Therefore, in this paper it is proposed a new form of single loop negative feedback with which you have all the advantages mentioned above, with the novelty of not penalizing the gain of the amplifier. Therefore, theoretical developments were made with the purpose to verify the simulations on the Multisim™ Software of National Instruments Inc. the way it works, as you can see in this paper.

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Section: Realimentación Negativa Convencionalunclassified

Realimentación Negativa AS: Una Aproximación a la Realimentación Negativa sin Reducción de Ganancia

García

2013

prospect

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“…2 presents a practical difficulty in simulating the controlled source y\ 2e V 2 . It can be overcome by the use of a matched transistor as described by Blecher,2 or alternatively by carrying out a set of four measurements as outlined below.…”

Section: Figmentioning

confidence: 99%

Return-difference measurement in transistor feedback amplifiers

Hakim

1965

Proc. Inst. Electr. Eng. UK

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33)For each bandpass filtering characteristic, the required bandwidth determines co,, which determines the characteristic function (co 2 ) and the parameter 8. Eqn. 2 is used to evaluate the constant H for a specified minimum passband return loss /. The frequency dependence of the insertion-loss function a is completely determined, and Darlington's insertion-loss technique 2 can be used to synthetise the desired coupling network. The filtering characteristics discussed above are realisable using ladder networks. Thus, for example, the characteristic function of the first bandpass filter, for which m = 1, can be realised by the ladder of Fig. 2. The J_JL source 1 \ coup_ljncj_netwo_rk ) loadFig. 2 Coupling network realising characteristic function of eqn. 3 MI = 0-2 I = 20O4dB R, = in Ci = 11015F L\ = 1-26128H C2 = 21577F L 2 = 111012H C3 = 1-42249F Li = 81494H RL = 07746O element values included apply to the case of co, = 0 -2 and / = 20 04dB.

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“…However, when discussing circuit design, the concept of delayed feedback has been usually disregarded. Although similar in nature, few contributions explore the effects of delays in feedback amplifiers [4][5][6][7]. Major emphasis of past achievements in this field point towards the necessity of careful design options to avoid stability problems brought by excess phase in the feedback path, such as avoiding large signal paths in the feedback when designing microwave amplifiers [4].…”

Section: Introductionmentioning

confidence: 99%

“…On [5,6] the authors add a delay element to the feedback path of a voltage buffer to enhance rise time. On [4,7] the presence of the delay element is analyzed as an excess phase element that can compromise stability. Allowing some instability to arise is also a well known method of achieving bandwidth enhancements.…”

Section: Introductionmentioning

confidence: 99%

On the Effect of Time Delays in Negative Feedback Amplifiers

Alves

Aguiar

2005 IEEE International Symposium on Circuits and Systems

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Abstract-Time delays are intrinsic to all existing devices and circuits. For the majority of applications, time delays are so small that their effects can be disregarded. However, when considering feedback amplifiers, depending on open-loop poles and loop gain, the effect of a small time delay inside the feedback path may turn to be of considerable importance. This paper analyzes the frequency response effects associated with time delays in feedback amplifiers, exploiting these effects to achieve bandwidth enhancements. An illustration of this effect is presented using a TL082 in series-shunt configuration, attaining 100% bandwidth extension, when associated with a 36m length RG58 coaxial cable as delay element.

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Design Principles for Single Loop Transistor Feedback Amplifiers

Cited by 24 publications

References 7 publications

Realimentación Negativa AS: Una Aproximación a la Realimentación Negativa sin Reducción de Ganancia

Realimentación Negativa AS: Una Aproximación a la Realimentación Negativa sin Reducción de Ganancia

Return-difference measurement in transistor feedback amplifiers

On the Effect of Time Delays in Negative Feedback Amplifiers

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