Keysight EXG and MXG X-Series Signal Generators User’s Guide 329
Adding Real–Time Noise to a Signal for N5172B/82B with Option 403 and 653/655/656/657
Adding Real-Time Noise (AWGN) to a Dual ARB Waveform
— Frequency: 1 GHz
— Amplitude: -10 dBm
— RF output: on
2. Select the factory–supplied waveform SINE_TEST_WFM:
a. Press Mode > Dual ARB > Select Waveform.
b. Highlight SINE_TEST_WFM and press Select Waveform.
3. Turn on the dual ARB player: press ARB Off On to highlight On.
4. Set the ARB sample clock to 50 MHz: Press ARB Setup > ARB Sample Clock > 50 > MHz.
5. Press Real–Time AWGN Setup and set the following:
— Carrier to Noise Ratio: 30 dB
— Carrier Bandwidth: 40 MHz
— Noise Bandwidth: 45 MHz
— Real–time AWGN: on
The signal generator’s displayed power level (–10 dBm) includes the noise power.
Carrier BW
(CBW)
RMS
(total carrier power)
C
Carrier BW
(CBW)
Carrier
Noise
N
Noise BW
(NBW) =
flat noise
bandwidth
The carrier now appears
larger because of the
added noise power.
Carrier Bandwidth (CBW) is typically the occupied
bandwidth of the carrier and the Noise Bandwidth is the
flat noise bandwidth (NBW).
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