Test Procedures R&S SMU200A
1007.9845.82 1.32
E-12
AM Frequency Response
Test assembly
See section "
Standard Test Assembly for Analog Modulations",
page 1.3.
Measurement
Settings on DUT
:
RF
On
Level P
min
+3 dBm
Amplitude Modulation menu:
Source External
External Coupling DC
AM depth 60%.
Vary the carrier frequency from 5 MHz to RF
max
. Recommended test
f
requencies 5 MHz, 450 MHz, 1 GHz, 2.2 GHz, 4.0 GHz. If
measurements of RF Frequency Response due to Modulation
(see page 1.44) are performed and meet specification, only one
measurement at 1 GHz is necessary, since AM uses the I/Q
modulator.
Setting on the signal generator
:
- LF
Output ON
- LFGen Voltage 1 V (V
peak
).
Vary the generator frequency to determine the modulation frequency
response. Measure the modulation depth as described above under
‘Uncertainties’.
The modulation frequency response is the difference between the
greatest and the smallest modulation depth.
Repeat the measurement with the internal modulation generator wi
th
the s
etting Source Internal.
Synchronous PhiM with AM
Test assembly
See section "
Standard Test Assembly for Analog Modulations",
page 1.3.
Measurement Settings on DUT:
RF
On
Level 0 dBm
Amplitude Modulation menu:
LF Gen Frequency 1 kHz
Source Internal
AM depth 30%.
Settings on R&S FSQ
FM DEMOD
DEMOD BW 12.5 kHz
MEAS TIME 10 ms
RESULT DISPLAY PM
Vary the carrier frequency from 5 MHz to RF
max
. Recommended test
f
requencies as above.
Measure the resulting phase modulation on the spectrum analyzer
with peak detection.
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