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Low‐noise one‐port microwave transistor amplifier
Author(s) -
Venguer A. P.,
Medina J. L.,
Chávez R.,
Velázquez A.
Publication year - 2002
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.10236
Subject(s) - amplifier , noise figure , electrical engineering , low noise amplifier , fet amplifier , effective input noise temperature , direct coupled amplifier , engineering , electronic engineering , transistor , circulator , linear amplifier , transistor array , y factor , rf power amplifier , operational amplifier , cmos , voltage
A new type of a microwave reflection amplifier with very low noise properties is presented. The proposed amplifier consists of a circulator and a one‐port circuit with the use of a transistor operating under negative resistance conditions. An expression for estimating the noise figure for this type of amplifier is proposed. Experimental results show that such a class of amplifiers that use only one transistor provides a higher transmission gain and a smaller noise figure than a conventional single‐stage amplifier, making it interesting to operate at millimeter‐wave frequencies. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 33: 100–104, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10236