fractional divider with sigma delta

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prescaler

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currently,i'm dealing with fractional pll,but a problem makes me puzzle.
my design focus on wide tuning range,but it require lots of divider modulus ,how does it get?because the sigma delta output only 8 levels at most.
if expanding divider modulus,how ?
 

what is the meas of 'wide tuning range'?
VCO or divider?
 

it means wide divide range.plz give me some clues.thanks a lot!
 

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