R&S SMU200A Test Procedures
1007.9845.82 1.41
E-12
Pulse Modulation
ON/OFF Ratio
Test equipment - Spectrum analyzer (Table 1-2, item 24)
- Pulse generator (Table 1-1, item 17)
Test setup To determine the ON/OFF ratio, connect the spectrum analyzer to the
RF output socket of the DUT and the pulse generator to the EXT MOD
socket on the rear of the DUT.
Measurement Setting on DUT:
P
ulse Modulation menu:
Source External
State On
Determine the output level of the DUT at various carrier frequencies
with a "high" and a "low" signal applied.
The difference between the output level with a "high" signal applied
and that with a "low" signal applied is the ON/OFF ratio.
Recommended test frequencies 150 MHz, 400 MHz, 1 GHz, 2.2 GHz, 3 GHz, 4.5 GHz, 6 GHz
Recommended test level P
max
Dynamic Characteristics
Test assembly As above for ON/OFF Ratio
Test method The spectrum analyzer is operated as a fast level meter with a span
of 0 Hz.
Measurement
Setting on pulse generator
:
- S
quarewave pulse sequence with a frequency of 100 kHz,
TTL level
Setting on DUT
:
RF
On
Level 0 dBm
Pulse Modulation menu:
State On
Vary the carrier frequency from 5 MHz to RF
max
. Recommended test
f
requencies as above.
Evaluate the pulse-modulated RF signal on the analyzer
.
R
ise time = time between 10% and 90% of RF amplitude
Fall time = time between 90% and 10% of RF amplitude
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