Test Procedures R&S SMB
1407.0806.82 1.18 E-5
SSB Phase Noise
The SSB phase noise of the DUT can be measured direct if a Phase Noise Test Set is available. An
R&S FSUP or any other analyzer with phase noise option is suitable if its own phase noise is at least 6
dB less than the guaranteed DUT Phase noise in the data sheet.
Measurement: Set the Level of the DUT to 0 dBm and measure the phase noise at 20 kHz offset with
the analyzer in phase noise mode.
If no suited analyzer is available, the Phase noise can be measured with the aid of a second generator
and a mixer:
Test assembly See section "Test Assembly for SSB Phase Noise and Jitter", page
1.4.
Test method The two generators are set to the test frequency and synchronized
with a phase offset of 90° (phase quadrature). Mixing to 0 Hz
suppresses the RF carrier. Due to the phase quadrature, the mixer
supplies a voltage representing the phase difference between the input
signals. This voltage is measured with the spectrum analyzer.
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