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Title: On the effect of time delays in negative feedback amplifiers
Author: Alves, L. N.
Aguiar, R.L.
Keywords: Bandwidth enhancement
Bandwidth extension
Delay elements
Feedback paths
Loop gains
Negative feedback amplifier
Shunt configuration
Delay circuits
Electric cables
Feedback amplifiers
Frequency response
Telecommunication cables
Time delay
Issue Date: 2005
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
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. © 2005 IEEE.
Peer review: yes
DOI: 10.1109/ISCAS.2005.1464755
ISBN: 0-7803-8834-8
ISSN: 0271-4310
Appears in Collections:DETI - Comunicações

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