R&S SGT100A, User Manual

Page: 203 / 593

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