graycode
Newbie level 2
Hi all :
I'm a newb of PLL designer. I have read materials about how to design 3rd order loop filter.
[the schematic just like : (C1// R2+C2) shunt to gnd with additional pole (R3,C3)]
But here comes the rules : R3>2*R2 ; C3<0.1*C1
why here comes this rules?
I have read about several paper but none of them gives the reason
Can anyone answer me ? Please.
I'm a newb of PLL designer. I have read materials about how to design 3rd order loop filter.
[the schematic just like : (C1// R2+C2) shunt to gnd with additional pole (R3,C3)]
But here comes the rules : R3>2*R2 ; C3<0.1*C1
why here comes this rules?
I have read about several paper but none of them gives the reason
Can anyone answer me ? Please.