Analytical expressions for simplifying the design of broadband low noise microwave transistor amplifiers

Author

Link, Gany N. ; Gudimetla, V. S Rao

Author_Institution

Maxim Integrated Products, Beaverton, OR, USA

Volume

43

Issue

10

fYear

1995

fDate

10/1/1995 12:00:00 AM

Firstpage

2498

Lastpage

2501

Abstract

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

Keywords

S-parameters; circuit noise; microwave amplifiers; network synthesis; wideband amplifiers; S-parameters; broadband LNA; low noise amplifiers; microwave transistor amplifiers; minimum noise figure; noise parameters; Bandwidth; Broadband amplifiers; Equations; Frequency; Gain; Low-noise amplifiers; Microwave amplifiers; Microwave transistors; Noise figure; Scattering parameters;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.466187

Filename

466187