Configuring the internal baseband source
R&S
®
SMM100A
169
User Manual 1179.1341.02 ─ 05
The
shows the calculation and conversion steps. The highlighted col-
umns contain the resulting I and Q values represented in Little endian format.
Figure 4-15: I and Q values calculation and conversion
3. Use an ASCII editor which is able to handle binary data. Create and add the follow-
ing mandatory tags before this binary data set can be further processed:
●
●
An example of the
SICO.wv
file contents could be:
{TYPE: SMU-WV, 0}{CLOCK: 10e6}{LEVEL OFFS: 3.010300,0.000000}
0000FF7F8E27BB79 ... 72D8BB79
To simplify the example, the checksum is set to 0, i.e. the instrument does not eval-
uate a checksum.
Tip:
The tags
TYPE
,
CLOCK
,
LEVEL OFFS
and
WAVEFORM
are mandatory for each
waveform. All other tags are optional and can be inserted after the
TYPE
tag in
arbitrary order.
4. Pack the binary data into a
tag with the described structure.
{WAVEFORM-Length: #I0Q0I1Q1I2Q2 ... InQn}
● Calculate the
Length
Length = Number of I/Q pairs * 4 + 1 = 20*4 + 1 = 81 bytes
● Place the string
{WAVEFORM-81:#
at the beginning of the data set
● Place the symbol
}
at the end of the data set
The contents of the waveform file
SICO.wv
for 20 I/Q pairs is now ready for opera-
tion and reads:
{TYPE: SMU-WV,0}
{CLOCK: 10e6}
{LEVEL OFFS: 3.010300,0.000000}
{WAVEFORM-81:#I0Q0I1Q1...InQn}
Using the arbitrary waveform generator (ARB)
