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• W417551612 abstract "Multipath ampli er theory In this thesis it is proven that the theoretical minimum noise measure of a multipath ampli er (an ampli er which has multiple parallel ampli ers) is achieved by using the optimum source impedance for the ampli er and the optimum gain for each ampli cation path. This optimum source impedance and gain can be calculated by using the optimum-loaded input network, i.e. by replacing each ampli er with its optimum source impedance. The resulting noise measure is the same as the minimum noise measure of the ampli ers used in the ampli cation paths. Whereas single-path ampli ers can achieve this minimum noise measure over narrow bandwidths, multipath ampli ers are theoretically able to achieve the minimum noise measure over very broad bandwidths. The theory is demonstrated by applying it to distributed ampli ers. In an ideal distributed ampli er, the magnitude of the optimum gain of the ampli cation paths decreases and the phase delay increases the farther the stage is from the input, with the decrease in gain being faster for higher frequencies. The challenge in designing broadband, low-noise, distributed ampli ers is to achieve optimum gain matching over broad bandwidths. Multipath ampli er design procedure Based on the theory, a three step design and optimisation procedure is introduced. Firstly, unconditionally stable ampli cation paths are designed to have small minimum noise measures, then an input network is designed for optimum source impedance matching and lastly an output network is designed for gain matching. Multipath ampli er prototype The theory and design procedure is demonstrated by optimising a 0.5-2 GHz distributed ampli er. An average noise measure of 0.3 dB is achieved, which is only 0.1 dB higher than the minimum noise measure of the ampli cation stages used. This increase is mainly due to transmission line loss and gain mismatch. Radio telescope feasibility Multipath ampli ers break the trade-o between noise temperature, bandwidth and source termination that a single-path ampli er has, because they have much more design freedom when designing the input network. In general, the more paths, the larger the low-noise bandwidth, but the larger and more complex the ampli er. Roughly two to three ampli cation paths are required per octave of bandwidth for LNAs around 1 GHz. When the bandwidth is very narrow, a single path is su cient. Multipath ampli ers have similar trade-o s between linearity and power consumption, between noise temperature and noise resistance, and between noise temperature and size to a single-path ampli er. Multipath ampli ers are therefore a feasible alternative for use in radio telescopes. Key terms: Multipath, low-noise, broadband, distributed ampli er, minimum noise measure, radio telescope receiver." @default.
• W417551612 created "2016-06-24" @default.
• W417551612 creator A5090664367 @default.
• W417551612 date "2010-01-01" @default.
• W417551612 modified "2023-10-01" @default.
• W417551612 title "A feasibility study of broadband low–noise amplifiers with multiple amplification paths for radio astronomy" @default.
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