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how to calculate the gain of Active loop filter in a DLL

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shady205

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active loop filter calculator

can anyone help me out how to calculate the gain of the loop filter....


ωN /ωref =( Kpd * Kvcdl * Icp * Kl )/ 2Π Cloop

where ωN = Close Loop BW

ωref = input reference frequency

Kpd , Kvcdl , Kl are the gains of Phase detector , VCDL , loop Filter

Icp = charege pump current

Cloop = loop capacitor....


in the above equation,by following design guideline the ratio considered is 1: 10 because inorder to make the small signal AC model of the DLL the above design consideration is done...

how to find Kl ,Cloop.....

Kpd = Vh - Vl / 2π

Kvcdl = 2π (Tmax - Tmin)/ (Vh-Vl)

my input reference freq is 100Mhz..
 

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