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Differential LNA for SKA Mid-frequency aperture array
Thesis (MEng)--Stellenbosch University, 2021.
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| Format: | Thesis |
| Language: | en_ZA |
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Stellenbosch : Stellenbosch University
2021
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| _version_ | 1867613755024605184 |
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| access_status_str | Open Access |
| author | Fry, Dylan |
| author2 | Gilmore, Jacki |
| author_browse | Fry, Dylan Gilmore, Jacki |
| author_facet | Gilmore, Jacki Fry, Dylan |
| author_sort | Fry, Dylan |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MEng)--Stellenbosch University, 2021. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/123785 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:41:10.692Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2021 |
| publishDateRange | 2021 |
| publishDateSort | 2021 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/123785 Differential LNA for SKA Mid-frequency aperture array Fry, Dylan Gilmore, Jacki Stellenbosch University. Faculty of Engineering. Dept. of Electrical and Electronic Engineering. UCTD Differential low noise amplifiers Aperture antennas Square Kilometre Array Radio frequency Radio telescopes Thesis (MEng)--Stellenbosch University, 2021. ENGLISH ABSTRACT: The sensistivity of a receiver is determined by the total collecting area of the radio system and the noise temperature of the system. To maximize the sensitivity, the collecting area needs to be made larger and the noise temperature needs to be lowered. Therefore, a system with a low noise temperature and a large array to increase the total collecting area, thereby increasing sensitivity. The Mid-Frequency Aperture Array (MFAA) is such a system that aims to increase sensistivity. The MFAA is planned to be deployed in the second phase of the SKA construction [2]. The project aims to cover a range of frequencies from 400 MHz up to 1500 MHz. A key objective of the MFAA is to measure the effect of dark energy of the universe, as well as high speed surveys of pulsars and various other transient events. Most MFAA prototypes make use of a differentially fed antenna. To lower the effects of matching networks and baluns on the noise figure of the receiver, a differential low noise amplifier can be directly matched to the differentially fed antenna. This thesis presents the design, manufacturing and measurement of a differential low noise amplifier for direct integration with a differentially fed antenna in the SKA MFAA. A study on the design process of a low noise amplifier, including published work and fundamental design theory is conducted. A single-ended LNA is simulated and measured and a gain larger than 10 dB, with a noise figure of approximately 1.1 dB and an output reflection coefficent below 10 dB across the operating frequency band (450 - 1450 MHz). A differential low noise amplifier is simulated and measured and a gain larger than 10 dB, with a noise figure of approximately 1.1 dB and an output reflection coefficent below 10 dB across the operating band. A differential low noise amplifier with high gain and a low noise impedance is achieved. The thesis includes a simulation-based investigation of the effect of an active impedance, due to the active differential-fed antenna, on the designed differential LNA. AFRIKAANSE OPSOMMING: Geen opsomming beskikbaar Masters 2021-11-18T09:43:05Z 2021-12-22T14:21:18Z 2021-11-18T09:43:05Z 2021-12-22T14:21:18Z 2021-12 Thesis http://hdl.handle.net/10019.1/123785 en_ZA Stellenbosch University 91 pages application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | UCTD Differential low noise amplifiers Aperture antennas Square Kilometre Array Radio frequency Radio telescopes Fry, Dylan Differential LNA for SKA Mid-frequency aperture array |
| title | Differential LNA for SKA Mid-frequency aperture array |
| title_full | Differential LNA for SKA Mid-frequency aperture array |
| title_fullStr | Differential LNA for SKA Mid-frequency aperture array |
| title_full_unstemmed | Differential LNA for SKA Mid-frequency aperture array |
| title_short | Differential LNA for SKA Mid-frequency aperture array |
| title_sort | differential lna for ska mid frequency aperture array |
| topic | UCTD Differential low noise amplifiers Aperture antennas Square Kilometre Array Radio frequency Radio telescopes |
| url | http://hdl.handle.net/10019.1/123785 |
| work_keys_str_mv | AT frydylan differentiallnaforskamidfrequencyaperturearray |