About The Linear Functions; About The Detroughing Function - R&S SGT100A User Manual

®
R&S SGT100A
See also
on page 152.
● About the Linear
● About the Detroughing
● About the Polynomial
● About the Shaping
● Shaping Function in Raw Data
● Converting Shaping Functions and Understanding the Displayed

About the Linear Functions

The linear shaping can be used for less demanding applications, simple analysis, and
the first interactions by designing the optimum envelope shape. Because the shaping
gain of the linear function is 0 dB, in "Envelope Voltage Adaptation > Manual" mode
this function is suitable for determining the "Pre-/Post-Gain" values (see
culating the current V
Provided are two linear functions, where each of them depends on the "Envelope Volt-
age Adaptation" mode:
●
Linear (Voltage)
–
–
●
Linear (Power)
–
–
Where:
●
the variable x depends on the "Envelope Voltage Adaptation" mode, see
●
The constant b is calculated as:
b = (V
See also
on page 152.

About the Detroughing Function

Detroughing functions are well-defined mathematical functions that prevent that the
supply voltage V
vent that the signal is clipped.
Provided are the following functions:
●
f(x) = x + d*e
●
f(x) = 1 - (1 - d)*cos(x*pi/2)
●
f(x) = d + (1 - d)*x
Where:
●
x is a variable, that depends on the "Envelope Voltage Adaptation" mode, see
Table 7-6
●
a is the
User Manual 1176.8674.02 ─ 07
"Converting Shaping Functions and Understanding the Displayed Values"
Functions................................................................................... 149
Function........................................................................... 149
Function............................................................................. 150
Table.......................................................................................151
in "Manual" mode"
CC
f(x) = x in "Auto Normalized/Manual"
f(x) = b*x + V in "Auto Power"
cc,min
2
f(x) = x in "Auto Normalized/Manual"
2
f(x) = b*x + V in "Auto Power"
cc,min
- V )/(V
cc,max cc,min in,max
"Converting Shaping Functions and Understanding the Displayed Values"
drops down to zero or falls under specified limits. That is, they pre-
cc
-x/d
a
Exponent (a)
Generation of Envelope Tracking Signals
Format................................................................. 152
on page 156).
- V )
in,min
Signal Generator Settings
Values............152
Example "Cal-
Table 7-6.
149