R&S SMU200A Test Procedures
1007.9845.82 1.51
E-12
Residual Carrier
Test equipment Spectrum analyzer (Table 1-2, item 24)
Test setup Connect the spectrum analyzer to the RF output of the DUT.
Measurement Settings on DUT:
Fr
equency 1 GHz
Level 0 dBm, ALC State OFF (S&H)
I/Q Settings menu:
Source Internal Bas
eband
State Off
BB In Settings menu:
State On
Mode analog i
nput
C
rest Factor 0 dB
Peak Level 0 dBfs
Settings on analyzer:
FREQ/CENTER = 1 GHz, SPAN 1 MHz
,
AM
PT/REF LEVEL = 5 dBm.
First measure the unmodulated level as a referenc
e.
T
hen switch on I/Q modulation with open inputs (I/Q Settings menu:
State On) and measure the residual carrier.
The residual carrier in dBc is the level of the residual
signal found referred to the output signal of the DUT
without modulation (dBc = referred to the carrier).
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