R&S SGT100A, User Manual

Page: 209 / 593

Signal Generator Settings
R&S
®
SGT100A
178 User Manual 1176.8674.02 ─ 07
Save/Recall Polynomial
Accesses the "Save/Recall" dialog, i.e. the standard instrument function for storing and
recalling the complete dialog-related settings in a file. The provided navigation possibil-
ities in the dialog are self-explanatory.
The file name and the directory it is stored in are user-definable; the file extension is
however predefined.
The polynomial files are files with extension
*.iq_poly
, see "File format of the poly-
nomial function file" on page 150.
Remote command:
[:SOURce<hw>]:IQ:OUTPut[:ANALog]:ENVelope:SHAPing:COEFficients:
CATalog?
on page 445
[:SOURce<hw>]:IQ:OUTPut[:ANALog]:ENVelope:SHAPing:COEFficients:
STORe
on page 445
[:SOURce<hw>]:IQ:OUTPut[:ANALog]:ENVelope:SHAPing:COEFficients:
LOAD
on page 445
Polynomial Order
Defines the polynomial order
n
, that is the number of polynomial coefficients (see
"About the Polynomial Function" on page 150).
Select "Apply" to confirm the settings.
Remote command:
See
[:SOURce<hw>]:IQ:OUTPut[:ANALog]:ENVelope:SHAPing:
COEFficients
on page 444
Polynomial constant and coefficients
Sets the polynomial constant a
0
and the polynomial coefficients a
1
to a
n
.
The polynomial constant and coefficients influence the envelope shape.
Remote command:
[:SOURce<hw>]:IQ:OUTPut[:ANALog]:ENVelope:SHAPing:COEFficients
on page 444
Apply, OK
Triggers the instrument to adopt the selected function.
Use "OK" to apply the setting and exits the dialog.
Remote command:
See
[:SOURce<hw>]:IQ:OUTPut[:ANALog]:ENVelope:SHAPing:
COEFficients
on page 444
7.6 Applying Digital Predistortion
Digital predistortion (DPD) is one of the methods, used to improve the efficiency of RF
power amplifiers. In the R&S
SGT, the generated digital signal can be deliberately
AM/AM and AM/PM predistorted.
Applying Digital Predistortion