R&S SGT100A User Manual page 203

®
R&S SGT100A
"Polynomial"
Remote command:
[:SOURce<hw>]:IQ:OUTPut[:ANALog]:ENVelope:SHAPing:MODE
Detroughing Function
Selects the mathematical function describing the detroughing.
The following functions are available:
●
f(x) = x + d*e
●
f(x) = 1 - (1 - d)*cos(x*pi/2)
●
f(x) = d + (1 - d)*x
where:
●
x depends on the "Envelope Voltage Adaptation" mode, see
●
d =
●
a =
For more information, see
played Values"
Remote command:
[:SOURce<hw>]:IQ:OUTPut[:ANALog]:ENVelope:SHAPing:DETRoughing:
FUNCtion
Couple Detroughing Factor with Vcc
Enable this parameter to derive the detroughing factor (d) from the selected V
This ensures that the minimum supply voltage V
limits and the signal is not clipped.
User Manual 1176.8674.02 ─ 07
The shaping function is defined by a polynomial with configurable
order and coefficients.
Select Polynomial Coefficients Setting
Figure 7-19: Effect of a polynomial shaping on the envelope and inverted enve-
lope signal
1 = RF signal (simple ramp function)
2a, 2b = Envelope signal E and inverted envelope signal E BAR
-x/d
a
Detroughing Factor (d)
Exponent (a)
"Converting Shaping Functions and Understanding the Dis-
on page 152.
on page 446
Signal Generator Settings
Generation of Envelope Tracking Signals
to access the settings.
2a
1
2b
Table 7-6
does not drop under the specified
cc
on page 442
value.
cc
172