Create a Noise Power Ratio Signal (NPR)

Follow this procedure to create a noise power ratio signal and to perform these related tasks:

• Set the NPR noise offset

• Set the NPR corrections
   

1. Start the software and configure the hardware.

2. From the Mode menu, select Noise Power Ratio (NPR).

   

   

3. Use the default settings or configure the NPR Settings as desired.

   

4. Click to download and play the waveform.

5. Configure the analyzer to view the signal.

Example NPR Signal

The following figures show an example of the default settings for a Wideband Arb Waveform Generator with Calibration.

• RF Output = On

• Frequency = 10 GHz

• Noise Offset = 1 MHz

1. Configure the analyzer as follows:

• Span = 100 MHz

• ResBW = 10 KHz

The analyzer display should look similar to the figure below.

2. Change the settings to:

• Span = 5 MHz

• Select Marker

Notice the carrier feedthrough at 10 GHz.

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Set the NPR Noise Offset

1. To offset the notch and noise away from the carrier, set the Noise Offset = 1 MHz.

   

2. Click to download and play the waveform.
   Notice that the PSG marker is at 9.999 GHz but the notch itself is still centered around 10 GHz.

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Set the NPR Corrections

1. Configure the NPR Settings as follows:

   

• Corrections = On

• Apply Amplitude Accuracy Adjustment = On

• Desired Suppression = 70 dBc

2. Click to Download.
   A progress window will appear during the correction process. In this case the correction algorithm may not achieve the 70 dB suppression in all tones.

3. Click   to Play the waveform.

4. Configure the analyzer:

• ResBW = 300 Hz

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