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Noise Figure and Gain Measurement - 31 pages PPT file

2013-09-29
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Noise Figure and Gain Measurements UP to 26 GHz 1ESP-kn | 18.10.01 | 1NOISE FIGURE AND GAIN MEASUREMENTS UP TO 26 GHz General Definition: The noise figure F of a system or network is defined as the ratio of the signal-to-noise ratio at the input port to the signal-to-noise ratio at the output port of the system or network. 01 | 2NOISE FIGURE AND GAIN MEASUREMENTS UP TO 26 GHz Input power level (dBm)Si / Ni -60Input power level (dBm) -40 -40S0 / N0 -60 -80NakT0B DUTfo -80 -100 -120GkT0BG + Na -100 -120Frequency For example, amplifier foFrequency F = Si / Ni Si / N i N + GN i N a + kT0 BG = = a = S o / N o GS i /( Na + GN i ) GN i kT0 BGkT0 Na BG T0 4.00 x 10-21 W/Hz = -174dBm/Hz Internal noise of the system Noise bandwidth of the system Gain of the system Noise reference temperature (defined as 290K) IEEE standard definition: Noise figure F is the ratio of the total output noise power (Na + kT0BG) to the power of the part of the output noise (kT0BG), which is the ratio of the total output noise power (Na + kT0BG) to the power of the part of the output noise (kT0BG).

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