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Theory and design of low-noise multipath amplifiers

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dc.contributor.author Visser, Barend
dc.contributor.author Krüger, Petrus Paulus
dc.contributor.author De Jager, Ockert Cornelis Ocker Cornelis
dc.date.accessioned 2012-10-11T13:07:50Z
dc.date.available 2012-10-11T13:07:50Z
dc.date.issued 2011
dc.identifier.citation Krüger, P.P. et al. 2011. Theory and design of low-noise multipath amplifiers. IEEE transactions on microwave theory and techniques, 59(2):414-424. [http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=22] en_US
dc.identifier.issn 0018-9480
dc.identifier.uri http://hdl.handle.net/10394/7475
dc.description Sponsored by : IEEE Microwave Theory and Techniques Society en_US
dc.description.abstract The theoretical minimum noise measure of a multipath amplifier (an amplifier that has multiple parallel amplifiers) is achieved by using the optimum source impedance and optimum gain for each amplification path. This optimum source impedance and gain can be calculated by replacing each amplifier with its optimum source impedance. The resulting noise measure is the same as the minimum noise measure of the amplifiers used. The theory is demonstrated by applying it to distributed am plifiers. In an ideal distributed amplifier, the magnitude of the optimum gain of the amplification 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 amplifiers is to achieve optimum gain matching over broad bandwidths. A numerical optimization procedure that separates source impedance and gain matching is proposed and demonstrated by optimizing a 0.5-2-GHz distributed amplifier. An average noise measure of 0.3 dB is achieved, which is only 0.1 dB higher than the minimum noise measure of the amplification stages used. This increase is due to transmission line loss and gain mismatch. en_US
dc.description.uri http://dx.doi.org/10.1109/TMTT.2010.2095878
dc.language.iso en en_US
dc.publisher IEEE en_US
dc.subject Distributed amplifiers en_US
dc.subject low-noise amplifiers en_US
dc.subject microwave amplifier en_US
dc.subject multipath amplifier (MPA) en_US
dc.subject noise cancellation en_US
dc.title Theory and design of low-noise multipath amplifiers en_US
dc.type Article en_US


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