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A Test and Characterisation Facility for Cryogenic Low Noise Amplifiers
This dissertation discusses how the receiver and the LNA contained within the receiver are the major contributors to the sensitivity. Furthermore, a method for testing and determining the equivalent noise temperature of a cryogenic LNA operating at a physical temperature of 20 K is selected and pres...
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| Format: | Thesis |
| Language: | English |
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Department of Electrical Engineering
2023
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| _version_ | 1867614486880321536 |
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| access_status_str | Open Access |
| author | Newton, Wesley |
| author2 | Schonken, Willem |
| author_browse | Newton, Wesley Schonken, Willem |
| author_facet | Schonken, Willem Newton, Wesley |
| author_sort | Newton, Wesley |
| collection | Thesis |
| description | This dissertation discusses how the receiver and the LNA contained within the receiver are the major contributors to the sensitivity. Furthermore, a method for testing and determining the equivalent noise temperature of a cryogenic LNA operating at a physical temperature of 20 K is selected and presented. This method was tested at the Klerefontein support base and the measurements allowed conclusions to be drawn that show that the uncertainty was unacceptable due to a few factors. One of the factors is the thermal gradient across the attenuator. This was investigated via a limited thermal study and a solution was proposed and implemented. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/38101 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:52:49.086Z |
| 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:11427/38101 A Test and Characterisation Facility for Cryogenic Low Noise Amplifiers Newton, Wesley Schonken, Willem Engineering This dissertation discusses how the receiver and the LNA contained within the receiver are the major contributors to the sensitivity. Furthermore, a method for testing and determining the equivalent noise temperature of a cryogenic LNA operating at a physical temperature of 20 K is selected and presented. This method was tested at the Klerefontein support base and the measurements allowed conclusions to be drawn that show that the uncertainty was unacceptable due to a few factors. One of the factors is the thermal gradient across the attenuator. This was investigated via a limited thermal study and a solution was proposed and implemented. 2023-07-14T08:55:45Z 2023-07-14T08:55:45Z 2023 2023-07-14T08:55:13Z Master Thesis Masters MSc http://hdl.handle.net/11427/38101 eng application/pdf Department of Electrical Engineering Faculty of Engineering and the Built Environment |
| spellingShingle | Engineering Newton, Wesley A Test and Characterisation Facility for Cryogenic Low Noise Amplifiers |
| thesis_degree_str | Master's |
| title | A Test and Characterisation Facility for Cryogenic Low Noise Amplifiers |
| title_full | A Test and Characterisation Facility for Cryogenic Low Noise Amplifiers |
| title_fullStr | A Test and Characterisation Facility for Cryogenic Low Noise Amplifiers |
| title_full_unstemmed | A Test and Characterisation Facility for Cryogenic Low Noise Amplifiers |
| title_short | A Test and Characterisation Facility for Cryogenic Low Noise Amplifiers |
| title_sort | test and characterisation facility for cryogenic low noise amplifiers |
| topic | Engineering |
| url | http://hdl.handle.net/11427/38101 |
| work_keys_str_mv | AT newtonwesley atestandcharacterisationfacilityforcryogeniclownoiseamplifiers AT newtonwesley testandcharacterisationfacilityforcryogeniclownoiseamplifiers |