A sampling wattmeter for noise power measurements

被引：0
|
作者：
Callegaro, L [1 ]
Pisani, M [1 ]
机构：
[1] Ist Elettrotecnico Nazl Galileo Ferraris, Turin, Italy
来源：
Noise in Devices and Circuits III | 2005年 / 5844卷
关键词：
Johnson noise; wattmeter; noise power; noise thermometry;
D O I：
10.1117/12.608787
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Low-frequency noise measurements are usually performed by measuring the voltage across a dipole, or the current through a wire. Here we demonstrate the feasibility of the measurement of the noise power flowing through a line connecting two dipoles. A sampling wattmeter. with spectral display capabilities, having a bandwidth in the range 1 Hz - 10 kHz and sensitivity better than 10(-22) W/Hz is here described, and employed to measure the noise power flowing between two resistors at different temperatures. Possible applications of the device include noise thermometry, noise measurement of active devices under load condition, investigations of excess noise below thermal threshold.
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页码：284 / 293
页数：10
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