Design considerations for CMOS low-noise amplifiers

A low-noise amplifier is the first active stage of a CMOS RF receiver. The inductively degenerated common-source LNA (CS-LNA) topology is currently popular because it achieves high gain, low noise figure, etc. The amplifier's performance is reviewed and the optimum Q value that gives the minimu...

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Bibliographic Details
Main Authors: Allstot, D.J., Xiaoyong Li, Shekhar, S.
Format: Conference Proceeding
Language:English
Subjects:
Amplifiers
Applied sciences
Circuit noise
Circuit properties
Circuit topology
Design. Technologies. Operation analysis. Testing
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Impedance matching
Integrated circuits
Low-noise amplifiers
Network topology
Noise figure
Power dissipation
Radio frequency
Radiofrequency integrated circuits
Resonance
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
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Summary:A low-noise amplifier is the first active stage of a CMOS RF receiver. The inductively degenerated common-source LNA (CS-LNA) topology is currently popular because it achieves high gain, low noise figure, etc. The amplifier's performance is reviewed and the optimum Q value that gives the minimum noise figure is derived. It is then compared to the conventional common-gate LNA (CG-LNA) in terms of gain, noise figure, input matching, reverse isolation and stability. Finally, a general g/sub m/-boosted design technique for common-gate RF circuits is introduced that provides lower noise figure and power consumption than the conventional CS-LNA and CG-LNA stages; it also preserves the CG-LNA insensitivity to parasitic input capacitances. In view of CMOS scaling, the CG-LNA topology is attractive for future higher frequency and/or lower power designs.
ISSN:1529-2517
2375-0995
DOI:10.1109/RFIC.2004.1320538