how to choose deltafvco in PLL design?

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lijulia

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I saw sb. use eqution to calculate Delta fvco=200K*(M*K/(M-K)), 200k is the channel spacing for GSM, what is M, K? how to choose the M,Kvalue? where I can find the detail explaination for this equtuion? then how to choose R conter value? if the cystal freq. is 19.2MHz, then R=19.2/deltafvco, right?
 

Can you please elaborate about M K R??????
 

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