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Investigation of stability for composite operational amplifiers
In the study of a paper by Campbell and Stephenson [1] on the possibilities of employing composite operational amplifiers to extend the high frequency performance of conventional RC active filters · it became evident that theoretical predictions of stability and experimental results did not agree. O...
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| Format: | Thesis |
| Language: | English |
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Department of Electrical Engineering
2023
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| _version_ | 1867613296878682112 |
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| access_status_str | Open Access |
| author | Schneider, Carl |
| author2 | Reineck, K. M |
| author_browse | Reineck, K. M Schneider, Carl |
| author_facet | Reineck, K. M Schneider, Carl |
| author_sort | Schneider, Carl |
| collection | Thesis |
| description | In the study of a paper by Campbell and Stephenson [1] on the possibilities of employing composite operational amplifiers to extend the high frequency performance of conventional RC active filters · it became evident that theoretical predictions of stability and experimental results did not agree. Other publications concerned with composite operational amplifiers merely presented circuits where it was implied that these would work under most conditions. However, when one set out to build such amplifiers and investigated their behaviour in frequency filters it emerged that severe stability problems beset such studies. The work here presented was initiated by the fact that hitherto the problem of stability had not received the attention that it warranted. Experimental results obtained by Campbell and . Stephenson made use of the Composite Two Operational Amplifier ( C20A ) by Mikhael and Nessim [2]. It was for this reason that investigations presented here also made use of this amplifier Theoretical studies by Campbell and Stephenson showed significant deviations from the experimental results, something which obviously required further investigation. By using the Nyquist Diagram Stability analysis technique to determine the stability of the open loop system it became possible to investigate the effect of the higher order terms of operational amplifier models. In fact, using Millman's [37] single, double, and triple pole models of the operational amplifier the results obtained came close to those obtained by the experiments. However. the procedure involves lengthy mathematical manipulations, and it was therefore decided to apply a standard stability evaluation technique of sufficient accuracy. The relatively simple Routh Criterion Stability analysis technique was considered where stability could be very conveniently established. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/38986 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:33:54.099Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2023 |
| publishDateRange | 2023 |
| publishDateSort | 2023 |
| publisher | Department of Electrical Engineering |
| publisherStr | Department of Electrical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/38986 Investigation of stability for composite operational amplifiers Schneider, Carl Reineck, K. M electrical engineering In the study of a paper by Campbell and Stephenson [1] on the possibilities of employing composite operational amplifiers to extend the high frequency performance of conventional RC active filters · it became evident that theoretical predictions of stability and experimental results did not agree. Other publications concerned with composite operational amplifiers merely presented circuits where it was implied that these would work under most conditions. However, when one set out to build such amplifiers and investigated their behaviour in frequency filters it emerged that severe stability problems beset such studies. The work here presented was initiated by the fact that hitherto the problem of stability had not received the attention that it warranted. Experimental results obtained by Campbell and . Stephenson made use of the Composite Two Operational Amplifier ( C20A ) by Mikhael and Nessim [2]. It was for this reason that investigations presented here also made use of this amplifier Theoretical studies by Campbell and Stephenson showed significant deviations from the experimental results, something which obviously required further investigation. By using the Nyquist Diagram Stability analysis technique to determine the stability of the open loop system it became possible to investigate the effect of the higher order terms of operational amplifier models. In fact, using Millman's [37] single, double, and triple pole models of the operational amplifier the results obtained came close to those obtained by the experiments. However. the procedure involves lengthy mathematical manipulations, and it was therefore decided to apply a standard stability evaluation technique of sufficient accuracy. The relatively simple Routh Criterion Stability analysis technique was considered where stability could be very conveniently established. 2023-09-29T13:31:55Z 2023-09-29T13:31:55Z 1987 2023-09-29T13:02:20Z Master Thesis Masters MSc http://hdl.handle.net/11427/38986 eng application/pdf Department of Electrical Engineering Faculty of Engineering and the Built Environment |
| spellingShingle | electrical engineering Schneider, Carl Investigation of stability for composite operational amplifiers |
| thesis_degree_str | Master's |
| title | Investigation of stability for composite operational amplifiers |
| title_full | Investigation of stability for composite operational amplifiers |
| title_fullStr | Investigation of stability for composite operational amplifiers |
| title_full_unstemmed | Investigation of stability for composite operational amplifiers |
| title_short | Investigation of stability for composite operational amplifiers |
| title_sort | investigation of stability for composite operational amplifiers |
| topic | electrical engineering |
| url | http://hdl.handle.net/11427/38986 |
| work_keys_str_mv | AT schneidercarl investigationofstabilityforcompositeoperationalamplifiers |