Measurement of Noise Figure for a VLF LNA
Author(s): CHEN Chuanke, JIANG Yuzhong, ZHANG Shuxia
Pages: 126-128,157
Year: 2015 Issue: 3
Journal: Ship Electronic Engineering
Keyword: noise figure; impedance; VLF; harmonic interference;
Abstract: A VLF low‐noise amplifier in a multi combination way can achieve lower noise figure .It has great signifi‐cance for deep water radio receiver .This kind of amplifier's noise voltage is about 3nv/sqrt(Hz) ,can't be measured directly due to the value is far less than the commonly used spectrum analyzer's sensitivity .Allowing for its particularity ,a redesign of the noise coefficient measurement is in demand .In this paper ,the factors affecting the noise coefficient measurement of LNA are discussed in detail ,such as impedance matching ,RF signal generator's background interference etc .Eventually a new means of measuring the noise coefficient ,with thorough scheme and implementation steps is proposed .
Pages: 126-128,157
Year: 2015 Issue: 3
Journal: Ship Electronic Engineering
Keyword: noise figure; impedance; VLF; harmonic interference;
Abstract: A VLF low‐noise amplifier in a multi combination way can achieve lower noise figure .It has great signifi‐cance for deep water radio receiver .This kind of amplifier's noise voltage is about 3nv/sqrt(Hz) ,can't be measured directly due to the value is far less than the commonly used spectrum analyzer's sensitivity .Allowing for its particularity ,a redesign of the noise coefficient measurement is in demand .In this paper ,the factors affecting the noise coefficient measurement of LNA are discussed in detail ,such as impedance matching ,RF signal generator's background interference etc .Eventually a new means of measuring the noise coefficient ,with thorough scheme and implementation steps is proposed .
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