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kaneie
kaneie
Visitor II
March 21, 2014
Question

SPIRIT1 / FDEV0 REGISTER ( PLL & DLL mode )

  • March 21, 2014
  • 1 reply
  • 663 views
Posted on March 21, 2014 at 09:16

Hi,

What is the recommendation about the use of these two algorithms in the application? By default DLL is selected, I would like to understand if it is possible to use PLL mode or not. Any more detailed description about this topic would be great.

Thanks

Rgds
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1 reply

Nickname1920_O
Nickname1920_O
Visitor II
March 21, 2014
Posted on March 21, 2014 at 09:30

Hello,

The DLL algorithm is a first order loop and it is able to control the delay of the local bit timing generator in order to align it to the received bit period. 

The PLL algorithm is a more complex second order loop that tracks the phase error of the local timing generator relative to received bit period and controls both frequency and phase to achieve the timing lock. 

The suggestion is to use the PLL algorithm only when a large (> 3%) bit timing error is espected.

Regards,

Gaetano

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