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An analytical expression for the minimum achievable noise figure for a specified gain at a given frequency is derived for a microwave amplifier. The minimum noise figure is given in terms of the specified gain, the amplifier noise parameters, and the S-parameters. Similarly, another expression for the maximum gain at a specified noise figure is derived in terms of the noise figure, the noise parameters, and the S-parameters. It is shown that these expressions simplify the tradeoff considerations for broadband low noise amplifier design by avoiding the need to draw several constant noise and gain circles at each frequency of interest
Published in:
Microwave Theory and Techniques, IEEE Transactions on
(Volume:43
,
Issue:
10
)
Date of Publication: Oct 1995
- Page(s):
- 2498 - 2501
- ISSN :
- 0018-9480
- INSPEC Accession Number:
- 5082752
- Digital Object Identifier :
- 10.1109/22.466187
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 06 August 2002
- Issue Date :
- Oct 1995
- Sponsored by :
- IEEE Microwave Theory and Techniques Society
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