In the datasheet of hmc3716, it told me that the PFD Gain is 2/2π V/rad. What confused me a lot is that the unit of PFD Gain is A/rad in a traditional PLL. Using the PFD gain in A/rad multiplied by the loop filter transfer function gives the tuning voltage to adjust the VCO frequency. However, we can not get the tuning voltage when the unit of PFD Gain is V/rad. So how should I deal with this issue? Look forward to hearing from you!