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Noise.php   10218 Bytes    09-03-2016 22:11:54

# Noise Figure Measurement In order to measure the noise figure, we need a signal generator, a DUT (device under test) and a spectrum analyser. (Or equivalent equipment.) • Terminate the input of the DUT with an adequate terminator (usually 50 Ω). • Connect the spectrum analyser at the output of the DUT. • Select a useful bandwidth and measure the Noise power at the frequency of interest. As the terminator is matched to the input of the DUT, it will deliver half of the power to the DUT. (power matching). The DUT will amplify that noise power and add its own noise. Pterm = Gain * 1/2 * F * 2 * k * T * B  Now connect the signal generator and set the power level therefore, that the measurement at the spectrum analyser increases by 3 dB. Pterm + 3 dB =  1/2 * F * Gain * 2 * k * T * B   +   Pgenerator * Gain rearranging for F yields in : F = PG * 1 / (k * T * B)     where   PG = PGeneratorHints : As the Noise power depends on the Bandwidth, it is wise to note the Power and the measurement-bandwidth. Decreasing the Bandwidth by a factor of 10 will reduce the noise level by 10 dB. And vice versa. In the left picture the bandwidth is 300 kHz, on the right side 3 MHz.Credits : The Visualisation uses https://www.mathjax.org/

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