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Application Note
GB1400 User Manual 2-49
Application Example
QPSK BER Testing using PRBS Data for 2-Channel I & Q
QPSK Mod / Demod
I
Q
I
Q
Delay line
or long
coax cable
GB700/1400 Tx
DATA
CLOCK
DATA
CLOCK
Delay line can simulate a PRBS pattern with an offset of n-clock bits.
Both I and Q channels running PRBS data (but offset by n-clocks).
GB700/1400 Rx
data clock
GB700/1400 Rx
data clock
I-Channel BERT
Q-Channel BERT