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12 GHz Low-Noise MMIC Amplifier with GaAs Pulse-Doped MESFET's
Nobuo SHIGA Shigeru NAKAJIMA Nobuhiro KUWATA Kenji OTOBE Takeshi SEKIGUCHI Ken-ichiro MATSUZAKI Hideki HAYASHI
IEICE TRANSACTIONS on Electronics
Publication Date: 1994/09/25
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Microwave and Millimeter Wave Technology
MMIC, low-noise, amplifier, GaAs MESFET,
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A monolithic four-stage low-noise amplifier (LNA) was successfully demonstrated for direct broadcast satellite (DBS) down-converters using 0.3 µm gate pulse-doped GaAs MESFET's This paper presents the design and test results of the LNA. The key feature of the research is a detailed demonstration of the difference between a noise figure of the four-stage LNA and an optimal noise figure of an employed FET with simulation and experiments. This LNA shows VSWR's of below 1.5: 1 as well as a noise figure of 1.1 dB and a gain of 28 dB at 12 GHz. To the best of our knowledge, it is the lowest noise figure reported so far in 12 GHz-band MMIC amplifiers. In the power characteristics, a 1 dB compression point (P1dB) of 10 dBm and a third order intercept point (IP3) of 19 dBm were shown.