Tektronix 071-0590-00 Qpsk BER Testing using Prbs Data for 2-Channel I & Q, Channel Bert

Application Note

Application Example

QPSK BER Testing using PRBS Data for 2-Channel I & Q

I-Channel BERT

GB700/1400 Rx

GB700/1400 Tx

DATA

DATA

CLOCK

CLOCK

Delay line or long coax cable

I

Q

QPSK Mod / Demod

I

Q

dataclock

Q-Channel BERT

GB700/1400 Rx

dataclock

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).

GB1400 User Manual 2-49