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 A time-delay technique to improve GBW on negative feedback amplifiers
Please use this identifier to cite or link to this item http://hdl.handle.net/10773/5205

title: A time-delay technique to improve GBW on negative feedback amplifiers
authors: Alves, L. N.
Aguiar, Rui L.
keywords: Delayed feedback
Feedback amplifiers
Gain-bandwidth product
Amplifiers (electronic)
Electric cables
Electric network analysis
Military data processing
Operational amplifiers
Telecommunication cables
Telecommunication systems
Time delay
Bandwidth improvements
Delay elements
Delayed feedback
Feed back loops
First orders
Gain-bandwidth product (GBWP)
Negative feedback amplifiers
Operational amplifier (Opamp)
Shunt feedback
Time delaying
Time-delay elements
Control theory
issue date: 2008
publisher: John Wiley and Sons
abstract: This paper presents a new method to improve the GBW (gain-bandwidth product) on negative feedback amplifiers. The proposed method is based on the introduction of time-delay elements in the feedback loop, which can be exploited to retrieve significant bandwidth enhancements. This delayed feedback concept is analyzed, and considerations are presented for first-order amplifiers, based on theoretical analysis. The concept is simulated and further demonstrated in a practical example using a series-shunt feedback amplifier with a TL081 operational amplifier (OA) and a 36-m-long coaxial cable as a delay element. Measured experimental results show a maximum bandwidth improvement of almost 90%, from a theoretical maximum of 141%. Copyright © 2007 John Wiley & Sons, Ltd.
URI: http://hdl.handle.net/10773/5205
ISSN: 0098-9886
publisher version/DOI: http://dx.doi.org/10.1002/cta.441
source: International Journal of Circuit Theory and Applications
appears in collectionsDETI - Artigos

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