jihrenee
Junior Member level 2
For an analog PLL, the loop filter is to filter out high frequency jitter from the output of CP.
But for a digital PLL, why we still need to use digital loop filter?
I mean, for a typical digital PLL, its architecture is:
in_ref, in2--> TDC --> DLF --> DCO --> in2
The output of TDC is binary waveform (0101...)
why we still need a digital loop filter?
But for a digital PLL, why we still need to use digital loop filter?
I mean, for a typical digital PLL, its architecture is:
in_ref, in2--> TDC --> DLF --> DCO --> in2
The output of TDC is binary waveform (0101...)
why we still need a digital loop filter?