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Figure 32. Quadrature amplitude modulated
(QAM) signal generated by combining an
amplitude modulated cosine carrier (upper) and
an amplitude modulated sine carrier. There are
16 symbols, so this is 16-QAM.
I In
I/Q Modulated RF Out
Discrete Q Signal
Discrete I Signal
Ch. 2 Out
Ch. 1 Out
AWG
RF Generator
Controller (PC)
Oscilloscope (DSO)
Q In
DUT
Figure 33. This block
diagram shows the
setup for quadrature
modulation. For more
information about
suitable RF sources,
contact your local
Tektronix
representative.
I pattern x carrier
Q pattern x carrier
Sum