MC12181

8

MOTOROLA RF/IF DEVICE DATA

Figure 10. Overall Transfer Function of the PLL

For the 2nd Order PLL:

Vp

Co

Ro

Vt

ZLF(s) +

RoCos ) 1

Cos

TLF(s) +

Vt(s)

Vp(s)

+ 1, Vp(s) + Kp(s)ZLF(s)

For the 3rd Order PLL:

Vp

Co

Ro

Vt

ZLF(s) +

RoCos ) 1

CoRoCas2 ) (Co ) Ca)s

TLF(s) +

Vt(s)

Vp(s)

+ 1, Vp(s) + Kp(s)ZLF(s)

Ca

For the 4th Order PLL:

Vp

Co

Ro

Vt

ZLF(s) +

(RoCos ) 1) (RxCxs ) 1)

CoRoCaRxCxs3 ) [ (Co ) Ca)RxCx ) CoRo(Cx ) Ca) ] s2 ) (Co ) Ca ) Cx)s

TLF(s) +

Vt(s)

Vp(s)

+

1

(RxCxs ) 1)

,Vp(s) + Kp(s)ZLF(s)

Ca

Rx

Cx

Figure 11. Typical Charge Pump Current versus Temperature

(VCC = 5.5 V; VP = 6.0 V)

FIGURES 11 THRU 17 COULD NOT BE PROCESSED

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