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I am modeling a
Dual loop CDR for USB 3.0 PHY. As per jitter budgeting of USB 3.0, it specifies
a deterministic jitter of 143pSec and random jitter of 4.03pSec. As I was trying
to model random jitter using Verilog A function $dist_normal (seed, mean, sd) with
mean=0 and sd=4.03p and similarly deterministic jitter using $dist_uniform (seed,
start, end) with start= -71.5p and end= 71.5p, my CDR was unable to track data having
deterministic jitter of 143pSec for a data rate of 5Gbps (but CDR tracks data
if the jitter value is half of the specified above, that is below 80ps). So my
query is that,
Is this the right way to model
deterministic jitter and random jitter? And also do we have to add this much of
Jitter into the data for a data rate of 5Gbps?
Thanks and Regards,
> Is this the right way to model
deterministic jitter and random jitter?
I do not think your model accurately captures the frequency characterstics of the entire channel. Specifically, from the USB 3.0 standard, the TX components of the random and deterministic jitter are specified after the application of the appropriate jitter transfer function (Note 6, Table 6-8 of standard). As such, the magnitude of the random and deterministic jitter components will vary with frequency. Similarly, the receiver jitter components will also vary with frequency and I am not sure how you are capturing that in your model.
As a result of using your model, when you simulate the CDR, that has a known jitter tolerance depending on its bandwidth, you may be applying far too much jitter at frequencies beyond the tracking capability of the CDR. This will reduce the eye margin and may lead to bit errors.
> And also do we have to add this much of
Jitter into the data for a data rate of 5Gbps?
I would recommend, Jithin, that you study the USB 3.0 document entitled "USB Superspeed Compliance Methodology" and the USB 3.0 receiever and transmitter physical layer compliance sections of the USB 3.0 standard to create a more accurate model of the pertinent noise profiles.
I hope this helps,
In reply to smlogan: