12 | ni.com | NI PXIe-5653 Calibration Procedure
5. Set the RF frequency to 5.4125 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 5.4125 GHz.
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 measurements.
9. Set the RF frequency to 7.8125 GHz and commit the settings to hardware.
10. If your signal source analyzer does not automatically center for phase noise measurements,
manually set the signal source analyzer center frequency to 7.8125 GHz.
11. Repeat steps 7 through 8 using the new frequency and record the measurements.
12. Ensure that the recorded measurements are within the limits set in Table 3.
Verifying LO2 Phase Noise
This verification ensures that the internal LO2 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
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
Table 3. LO1 Phase Noise Density (dBc/Hz)
Offset LO1 at 5.4125 GHz LO1 at 7.8125 GHz
100 Hz <-89 <-86
1 kHz <-118 <-115
10 kHz <-128 <-127
100 kHz <-125 <-125
1 MHz <-141 <-141
5 MHz <-155 <-155
Table 2. LO1 Manual Sweep Settings (Continued)
Carrier Frequency Offset Resolution Bandwidth Cross Correlation
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