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hlp! Prescaler in fractional frequency synthesizer

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bob_lv

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The center freq. of VCO is 1.8G, so for fractional pll frequency synthesizer, 8/9 and 16/17 prescaler, which one is better choice? (Fref is 26MHz, when 16/17 prescaler is used ,the Fref is divided by 4).
 

Can anyone help me?
And another question. How to design the dividers(P_counter and S_counter) after prescaler? I means use verilog codes or design it by myself? And the counters are synchronous or asychronous?
 

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