On the impact of channel loss on CDR locking

This paper shows that under certain conditions of incoming jitter in clock and data recovery circuits (CDR), the bang-bang phase detector (BBPD) gain can rise even for increments in the channel loss. Even more, it is shown how the BBPD gain can increase when sinusoidal and uniform jitter noise are combined; impacting on the CDR dynamic response. These observations are not clearly reported in the literature and here are presented in two approaches. First, direct measurements by using an extraction procedure that allows get the BBPD gain and second, by presenting an explanation through the convolution of probability density functions.