R&S SMB Test Procedures
1407.0806.82 1.19 E-5
Measurement Set the levels of the two generators in accordance with the speci-
fications of the mixer used. (For the MITEQ-DB0118 mixer set the
LO-level to +10 dBm and the RF-level to 0 dBm.)
Settings of the DUT:
- PM int
- PM deviation 0.01 rad
-
Modulation frequency 19 kHz
Settings on the analyzer:
- Center frequency 19.5 kHz
- Span 2 kHz
- Input coupling DC
- Attenuator manual 0 dB
- average on, count = 10
- average mode: linear/ power
- Filter Type: FFT
- Resolution Bandwidth 10 Hz
- set marker to 19 kHz.
- set delta marker to 20 kHz
Adjust the phase of the DUT for phase quadrature:
Set the Delta Phase in the Frequency/Phase menu for maximum
marker readout at 19 kHz in the Delta Phase range of 0° to 180°.
Note down the relative Delta marker level D.
Calculate the SSB phase noise in dbc/Hz:
- The Delta Marker measures the noise in 10 Hz bandwidth. The
power in 1 Hz bandwidth is one tenth of this power: log
10
(10)
- The PM with a modulation rate of 0.01 rad is equivalent to a
phase noise of -46 dBc.
- In baseband the two sidebands fall on each other: -6dB
- The phase noises of the two generators add together: - 3dB if
they are of the same type.
If the reference generator is of the same type as the DUT:
PN = D -10 * log
10
(10) – 46 dB – 3 dB
PN = D – 59 dB
If the phase noise of the reference generator is at least 10 dB
better than the phase noise of the DUT:
PN = D- log
10
(10) – 46 dB
PN = D – 56 dB
Recommended test
frequencies
1 GHz, 2.2 GHz, 3.2 GHz, 4 GHz, 6 GHz
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