26
Figure 32. Quadrature amplitude modulated
(QAM) signal generated by combining an
amplitude modulated cosine carrier (upper) and
an amplitude modulated sine carrier. There are
16symbols, 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