Publicação
On the usage of delayed-feedback in amplifiers
| Resumo: | Time delays are Intrinsic to all electronic circuits and feedback amplifiers are no exception. The effect of a small time delay inside the feedback path may turn to be of considerable importance. Depending on the open-loop poles, the loop-gain and the time delay, the closed-loop response may be unstable. This paper shows that it is possible to explore the presence of time delays in feedback amplifiers in order to achieve significant bandwidth enhancements, without losing stability. A practical demonstration of these concepts is presented. The delayed feedback concept is then applied to the case of cascade association of amplifiers, showing the possibility of associating a large number of stages without the inherent bandwidth loss. |
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| Autores principais: | Alves, L. N. |
| Outros Autores: | Aguiar, R.L. |
| Assunto: | Bandwidth Cascade connections Closed loop control systems Delay circuits Gain control Bandwidth enhancements Loop gain Losing stability openAccess Feedback amplifiers |
| Ano: | 2005 |
| País: | Portugal |
| Tipo de documento: | documento de conferência |
| Tipo de acesso: | acesso restrito |
| Instituição associada: | Universidade de Aveiro |
| Idioma: | inglês |
| Origem: | RIA - Repositório Institucional da Universidade de Aveiro |
| Resumo: | Time delays are Intrinsic to all electronic circuits and feedback amplifiers are no exception. The effect of a small time delay inside the feedback path may turn to be of considerable importance. Depending on the open-loop poles, the loop-gain and the time delay, the closed-loop response may be unstable. This paper shows that it is possible to explore the presence of time delays in feedback amplifiers in order to achieve significant bandwidth enhancements, without losing stability. A practical demonstration of these concepts is presented. The delayed feedback concept is then applied to the case of cascade association of amplifiers, showing the possibility of associating a large number of stages without the inherent bandwidth loss. |
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