Effect of the Input and Output Impedance on Amplifier Large-Signal Noise Performances

Author

Garmendia, Nagore ; Portilla, Joaquín

Author_Institution

Electr. & Electron. Dept., Univ. of the Basque Country, Bilbao, Spain

Volume

59

Issue

6

fYear

2011

fDate

6/1/2011 12:00:00 AM

Firstpage

1571

Lastpage

1578

Abstract

The effect of input and output amplifier impedance on the amplifier amplitude-modulation (AM) and phase-modulation (PM) noise, as well as on noise figure (NF) is studied in linear and nonlinear regimes. Simulations and measurements performed on different implemented amplifier prototypes corroborate that the behavior of the amplifier AM, PM, and effective NF levels in large-signal conditions depends on input and output matching conditions. Moreover, correlation between noise degradation in compression and the shape of the derivatives of the AM-AM and AM-PM conversion curves is analyzed and discussed. Conclusion of the study can be applied at the design stage to optimize the amplifier noise performances in the nonlinear regime.

Keywords

amplitude modulation; circuit noise; impedance matching; low noise amplifiers; phase modulation; phase noise; AM-AM conversion curves; AM-PM conversion curves; amplifier amplitude-modulation; amplifier impedance effect; amplifier large-signal noise performances; input impedance; noise figure; output impedance; phase-modulation noise; Gain; Impedance matching; Noise level; Noise measurement; Power measurement; White noise; Amplifier; amplitude-modulation (AM) noise; flicker noise; matching networks; noise figure (NF); nonlinear noise; phase-modulation (PM) noise; white noise;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2011.2114673

Filename

5738363