Phase detection scheme and loop filter

[kami70b]

i am designing a phase lock loop i want to know how can i detect the incoming phase and compute the phase error and what type of loop filter should i use to generate corresponding frequency control words to be given to the nco (vco) to bring phase error to zero

 

[FvM]

For the selection of a suitable phase detector, you have to consider at least the input and NCO waveform, the input signal to noise ratio and the intended lock range. The best analog performance for sine waveforms, but a limited lock range is achieved with a multiplier, as usually done with classical analog lock-in amplifiers. For the loop filter, I would start with a PI characteristic.