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Why PLL is used instead of DLL for DDR?

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prashantbabu

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Hi folks,
I have a basic question regarding PLL clock drivers for DDR applications.
Why is it that PLLs are used when a DLL can accomplish the same function.
Since we are not multilpying the input frequency and we are just buffering the input clock to many output channels, I think that a DLL should do just fine rather than a PLL.
Can anybody please clear my doubt?
Thanks in advance!
 

PLL vs. DLL for DDR

Please, first explain the differences (and trade-offs) between PLL & DLL, especially in terms of practical implementations in full customed CMOS process.
 

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