A Broadband Multistage LNA With Bandwidth and Linearity Enhancement

Design techniques to enhance bandwidth and linearity of broadband multistage low-noise amplifiers (LNAs) are presented. A feedback amplifier circuit is proposed to compensate for transistor gain roll-off with frequency in other amplifier stages and extend overall bandwidth. Moreover, a transistor wi...

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Bibliographic Details
Published inIEEE microwave and wireless components letters Vol. 26; no. 10; pp. 834 - 836
Main Authors Nikandish, Gholamreza, Yousefi, Alireza, Kalantari, Milad
Format Journal Article
LanguageEnglish
Published IEEE 01.10.2016
Subjects
Bandwidth
Bandwidth enhancement
broadband amplifier
Broadband communication
feedback amplifier
Gain
Linearity
low-noise amplifier (LNA)
monolithic microwave integrated circuit (MMIC)
Noise measurement
Stability analysis
Transistors
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Summary:Design techniques to enhance bandwidth and linearity of broadband multistage low-noise amplifiers (LNAs) are presented. A feedback amplifier circuit is proposed to compensate for transistor gain roll-off with frequency in other amplifier stages and extend overall bandwidth. Moreover, a transistor width tapering in a multistage LNA is applied to improve linearity. These techniques are adopted in a three-stage monolithic microwave integrated circuit (MMIC) LNA implemented in a 0.1-μm GaAs pHEMT process. The LNA features 18-43 GHz bandwidth, 21.6 dB average gain, and 1.8-2.7 noise figure (NF). It exhibits output 1-dB compression point of 11.5 dBm at 30 GHz and consumes 70 mA bias current from a 2-V supply.
ISSN:1531-1309
1558-1764
DOI:10.1109/LMWC.2016.2605446