Rohde & Schwarz SMBV100B, User Manual

Page: 171 / 1030

Configuring the Internal Baseband Source
R&S
®
SMBV100B
169 User Manual 1178.4460.02 ─ 03
+1.0 -> 32767 -> = 0x7FFF
0.0 -> 0 -> = 0x0000
-1.0 -> -32767 -> = 0x8001
The Figure 3-15 shows the calculation and conversion steps. The highlighted col-
umns contain the resulting I and Q values represented in Little endian format.
Figure 3-15: 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:
●
CLOCK
● LEVEL OFFS
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
WAVEFORM
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
Using the Arbitrary Waveform Generator (ARB)