New Methods to Improve Noise Figure of Microwave CMOS LNAs
Date Issued
2005
Date
2005
Author(s)
Sun, Kuo-Jung
DOI
en-US
Abstract
The purpose of this thesis is to develop low noise amplifiers employing commercial standard CMOS processes to achieve better noise performance. Two methods to improve the noise characteristics were used to design LNAs.
The first approach for improving noise characteristics of the LNA is using the device-size selection to optimize the noise performance. By incorporating the series resistances of the on-chip inductors into the noise optimization procedure, the optimum device size can be selected more appropriately. The 10 GHz LNA has a measured gain 11.25 dB with the noise figure below 3 dB.
The second approach for improving noise characteristics of the LNA is using the parallel-resonant technique between the two stages of the cascode LNA, the LNA achieved measured noise figure of 2.5 dB, which is about 0.5 dB noise figure improvement over the first circuit.
Subjects
低雜訊放大器
金氧半場效電晶體
改善雜訊
微波
LNA
low noise amplifier
CMOS
noise improvement
microwave
Type
thesis
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