Dear all,
I hope everybody is doing well these days.
I'm trying to understand the difference between PRBS13, QPRBS13, PRBS13Q
for the purpose of characterizing a 53G/106G PAM4 Tx stage.
1. Does anyone have an excel file with a full bit description of these bit
patterns?
2. Do all 3 patterns have similar spectrum content? similar baseline wander
when AC caps are used?
3. I'm having difficulties understanding the following description of a
PRBS13Q pattern (IEEE cd spec). Does anyone have a better example?
"Since the PRBS13 pattern is an odd number of bits in
length, bits which are mapped as the first bit of a PAM4 symbol during one
repetition of the PRBS13
sequence are mapped as the second bit of a PAM4 symbol during the next
repetition of the
PRBS13 sequence, and bits which are mapped as the second bit of a PAM4
symbol are mapped as the first
bit of the following symbol in the next repetition of the PRBS13 sequence.
For example, if the PRBS13
generator used to create the PRBS13Q sequence is initialized to a seed
value of 0000010101011 (with the
leftmost bit in S0 and the rightmost in S12), the PRBS13Q sequence begins
with the following Gray coded
PAM4 symbols, transmitted left to right:
1031320220111130103121231210012102121023131112."
Thank you!
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