prelab1 wireless Briefly explain the function of the \"SPAN\" setting on the Spe
ID: 2079013 • Letter: P
Question
prelab1 wireless
Briefly explain the function of the "SPAN" setting on the Spectrum Analyzer. Setup a Mathcad file to perform the calculations shown below. You may want to check for correctness against a hand calculator. If a 1GHz RF signal is measured on a spectrum analyzer to have an amplitude of -3dBm, what is the corresponding power in mW and Watts? Power = _____ mW = _____ Watts If an RF power level for a sinusoidal signal is determined to be 200 mW across a 50 ohm termination, calculate the peak voltage V_Peak and the root-mean-square (RMS) voltage V_RMS. V_peak = _____ Volts V_RMS = _____ Vrms If an oscilloscope is used to display a sinusoidal RF signal in the time domain and the peak voltage is measured as V_PEAK = 20mV. What is the corresponding RF power level in mW and dBm, assuming that the input impedance of the Oscilloscope is set to 75 ohms?Explanation / Answer
1. Spectrum Anayzer is used to display signal power versus frequency.
But using SPAN setting the Spectrum Analyzer displays signal power as the function of time.
2. 20log(P) = 3dBm where P = Power
logP = 3/20
= 0.15
P = 100.15
P = 1.4125 W
P = 1412.5 mW
3. P = V2RMS / R
200mW = V2RMS / 50
V2RMS = 200 * 10-3 * 50
VRMS = squar root of 10
= 101/2
VPEAK = VRMS * 21/2
= 201/2
4. P = V2RMS / R
= V2PEAK/ 2R
= 202 /(2*75)
= 2.67 micro Watts
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