As we know, PFD, CP, loop filter , N divider,VCO all contribute in band noise. But which is the major in band noisesource?

If the on Time Ton of Charge pump is very small (about several ns), the noise of CP will be very small. And the VCO noise is high passed, so VCO contributes neglible in band noise.

In Dean's book "PLL performance and simulation", his idea is that the PFD contributes the majority of in band noise. And he thinks the if the comparison frequency increases, the noise of PFD increases

Please help me!