what's the advantage of PLL compared with DLL?

[flesher]

Hi, If I need 20 phases clock whose frequency are same with input clock(165MHz). Do I need a PLL or DLL? thank you?

 

[dick_freebird]

With that many phases a DLL probably presents a better
"economy of implementation" if you're doing an IC design
(just make your main ring a 21-inverter cascade, sync
the last edge to the input to servo the bias).

But PLLs tend to have better attributes in frequency / phase
stability, probably owing more to the oscillator quality
that you can use (arbitrarily good if you have arbitrary
funds and space) and not so many slow, current starved
edges to convert voltage noise into jitter.

I think your discriminators lie in questions you haven't
asked yet.

 

[trayant]

may i ask flesher that why you need 20 phases clock?