How to determine the Dumping factor in third order PLL?

[mouzid]

Hi all,
I need a material tutorial on third order PLLs. I need to know how to determine the Dumping factor.
Thanks in advance.

 

[SergeyBondarev]

Re: Third order PLL

Refer to "Phase-Locked Loops/Roland E. Best", Chapter 4: Higher Order Loops.
The main problem - stability of the loop. You should choose the proper phase margin at the transit frequency ωT. The phase margin is correlated with damping factor in the second-order systems. What about the third-order PLLs, I can't say, maybe there is no such concept in these systems. Instead the phase margin is used. (see Figure 4.1 in the book).

 

[buckaroo]

Re: Third order PLL

E best's book is the worst book i have seen

Refer to "Phase-Locked Loops/Roland E. Best", Chapter 4: Higher Order Loops.
The main problem - stability of the loop. You should choose the proper phase margin at the transit frequency ωT. The phase margin is correlated with damping factor in the second-order systems. What about the third-order PLLs, I can't say, maybe there is no such concept in these systems. Instead the phase margin is used. (see Figure 4.1 in the book).

 

[layes2]

Third order PLL

damping 1 is best

 

[trayant]

Third order PLL

can refer to B.Razavi book..
Monolithic Phase-Locked Loops and Clock Recovery Circuit