Title :
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
fDate :
6/1/2011 12:00:00 AM
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;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2011.2114673
