R&S AFQ100A Operating Manual page 284

R&S AFQ100A
To be read by the instrument these waveform data must be coded binary and packed into an
appropriate WAVEFORM tag.
A tag consists of a name and a data set and is enclosed in curved brackets. The tag is a kind of label
carrying information about what the instrument should do with the data set (see above and step 3 of the
following instructions).
The following steps outline how to create the waveform file SICO.WV:
The values from the file SICO.TXT must be converted into binary format
Step 1
consisting of integer numbers without a sign and with 16-bit width. The numeric
range between –1.0 and +1.0 corresponds to the modulation range of the
waveform D/A converter of 65535 (2
+1.0
-1.0
A further C-program is suitable for creating the binary data set from the ASCII
values stored in SICO.TXT file (see following example for creating a C-program).
This program stores the binary data set to a file called SICO.WV.
The contents of the file SICO.WV reads as follows:
IQIQIQIQIQIQIQI ... IQ
Explanation:
The file SICO.WV now contains the binary data set corresponding to the 20 I/Q
Step 2
pairs. Before this binary data set can be further processed in step 3, the TYPE
and the CLOCK tag
{TYPE: SMU-WV, xxxxxxx}
{CLOCK: yyy} must be placed in front.
The TYPE tag must be the first entry in a WAVEFORM. The TYPE tag
identifies the waveform as a valid R&S Signal Generator waveform.
SMU-WV
Xxxxxxx
The TYPE tag informs the R&S Signal Generator about the clock rate of the
waveform.
yyy
1401.3084.32
32767
0
0.0
-32767
There is no readable representation for binary values in this document. This is
why we use the sequence IQIQIQ to characterize the binary code in the
present example.
denotes that the waveform is self-contained.
is the checksum of the waveform. To simplify our example 0 is
used, i.e., the R&S Signal Generator does not evaluate a
checksum.
is the clock frequency at which the waveform has to be
output, in Hz
AFQ Commands - Signal Generation
16
-1).
= 0x7FFF
= 0x0000
= 0x8001
6.23 E-3