Transmitter signal integrity in itself is irrelevant

The integrity of a Tx signal is relevant only as it pertains to how the Rx sees it. In previous posts, I discussed Tx and Rx emphasis techniques used to compensate for channel losses. In this blog, I will share a few important scope setups that allow you to best replicate the CDR in your Rx.

Loop BW

The loop BW acts like a jitter filter. Jitter frequencies below the loop BW are tracked and rejected. Jitter frequencies above the loop BW are passed to the Rx slicer/comparator. Silicon vendors compete by developing silicon that have essentially higher loop BW since that improves the signal integrity of the receiver, but there is often a cost associated with a larger loop BW.

To read the rest of this article, please visit my Scope Guru on Signal Integrity Blog, on EDN’s site.

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