14 | ni.com | NI PXIe-5653 Calibration Procedure
Verifying LO3 Phase Noise
This verification ensures that the internal LO3 circuitry is adjusted for correct phase noise
accuracy. Complete the following procedure to determine the as-found status of the NI 5653.
1. Connect the NI 5653 LO2 front panel connector to the signal source analyzer RF IN front
panel connector.
2. Create a new device session for the NI 5653.
3. Configure the signal source analyzer as follows:
• Phase noise measurement using cross-correlation PLLs and internal generators
• Automatic DUT detection
• Spur suppression enabled
• Fast Fourier transform (FFT) mode with Blackman-Harris window
• Measurement span from 100 Hz to 10 MHz (offset frequencies)
4. Use the signal source analyzer to perform a manual frequency sweep at the settings listed
in Table 6.
5. Set the RF frequency to 4 GHz and commit the settings to hardware.
6. If your signal source analyzer does not automatically center for phase noise measurements,
manually set the signal source analyzer center frequency to 800 MHz.
7. Check the signal generation status and verify that there are no reported errors or warnings.
8. Use the signal source analyzer to measure the phase noise. Record the results.
9. Close the device session.
Table 6. LO3 Phase Noise Frequency Sweep Signal Source Analyzer Settings
Carrier Frequency Offset Resolution Bandwidth Cross Correlation
100 Hz to 300 Hz 10 Hz 100
300 Hz to 1 kHz 30 Hz 1,000
1 kHz to 3 kHz 100 Hz 10,000
3 kHz to 10 kHz 300 Hz 10,000
10 kHz to 30 kHz 1 kHz 10,000
30 kHz to 100 kHz 1 kHz 5,000
100 kHz to 300 kHz 3 kHz 1,000
300 kHz to 1 MHz 10 kHz 1,000
1 MHz to 3 MHz 30 kHz 1,000
3 MHz to 10 MHz 100 kHz 1,000
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