Title: Low-Noise Amplifier Design With Dual Reactive Feedback for Broadband Simultaneous Noise and Impedance Matching
Authors: Fu, Chang-Tsung
Kuo, Chien-Nan
Taylor, Stewart S.
電子工程學系及電子研究所
Department of Electronics Engineering and Institute of Electronics
Keywords: Broadband input matching;capacitive feedback;low-noise amplifier (LNA);low power;noise optimized design;simultaneous noise and impedance matching (SNIM);transformer feedback;ultra-wideband (UWB)
Issue Date: 1-Apr-2010
Abstract: The simultaneous noise and impedance matching (SNIM) condition for a common-source amplifier is analyzed. Transistor noise parameters are derived based on the more complete hybrid-pi model, and the dominant factors jeopardizing SNIM are identified. Strategies for narrowband and broadband SNIM (BSNIM) are derived accordingly. A dual reactive feedback circuit along with an LC-ladder matching network is proposed to achieve the BSNIM. It includes a capacitive and an inductive feedback, where the former utilizes the transistor parasitic gate-to-drain capacitance and the latter is formed by transformer coupling. This circuit topology has been validated in 0.18- and 0.13-mu m CMOS technologies for a 3-11-GHz ultra-wideband (UWB) and a 2.4-5.4-GHz multistandard application, respectively. The 3-11-GHz UWB low-noise amplifier is detailed as a design example.
URI: http://dx.doi.org/10.1109/TMTT.2010.2041570
http://hdl.handle.net/11536/5544
ISSN: 0018-9480
DOI: 10.1109/TMTT.2010.2041570
Journal: IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume: 58
Issue: 4
Begin Page: 795
End Page: 806
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