Rohde & Schwarz SML01 - Vector Modulation (R&S SMV03 Only); Fig. 4-15 Example: Vector Modulation; Fig. 4-16 VECTOR MOD Menu (Preset Settings) R&S SMV03

R&S®SML / R&S®SMV03 Vector Modulation (R&S SMV03 only)
1090.3123.12 E-6 4.43
Vector Modulation (R&S SMV03 only)
In the vector modulation mode (I/Q modulation) external modulation signals can be applied to
modulation inputs I and Q for a complex modulation of the RF carrier.
I = 0.3 V
Q = 0.4 V
I
Q
IQ
V
22
05
+
,
x input value LEVELAmplitude =
SMV03
Fig. 4-15 Example: vector modulation
If the I/Q modulator is driven by a constant sum vector modulation of
IQ V
22
05+ = . the actual RF
level corresponds to the displayed RF level. To avoid the I/Q modulator being overdriven, care should
be taken that the sum vector never exceeds 0.5 V when digital modulation modes with amplitude
modulation components such as QPSK are used. For full-scale input, the peak envelope power of the
modulated RF signal is thus equal to the indicated LEVEL. The average power is smaller. The difference
can be entered as an offset in the LEVEL menu.
Vector modulation settings are accessible in the Vector Mod menu, see following page.
Menu selection: VECTOR MOD
Fig. 4-16 VECTOR MOD menu (preset settings) R&S SMV03