comparisons between PLL and DLL

[cdrguy]

anyone could tell me the merits and shorcomings of PLL and DLL?
which one is easier to lock in a very short time, say, within 50ns?

 

[IanP]

Try this link on PLL/DLL comparison:
**broken link removed**
Regards,
IanP

 

[layes2]

dll
is only 1st
and PLL often 3rd

 

[amarnath]

dll can used to acheive a quicker lock with the input.i have another question ,what is the main cause of jitter in a DLL.since in a DLL there is no VCO unlike a PLL,i believe the main causes should be the charge pump current mismatch and also the pfd charge injection and charge sharing phenomenon.correct me if iam wrong.

regards
amarnath

 

[Btrend]

dll can used to acheive a quicker lock with the input.i have another question ,what is the main cause of jitter in a DLL.since in a DLL there is no VCO unlike a PLL,i believe the main causes should be the charge pump current mismatch and also the pfd charge injection and charge sharing phenomenon.correct me if iam wrong.

regards
amarnath

power noise will contribute a lot, cause it cannot low pass easily by the loop.

 

[amarnath]

power supply noise also contributes to jitter in case of a pll.i have one more question,why do we need a start up circuit for a dll and what is the reason for false lock in a dll.

regards
amarnath