| Author |
Message |
mouzid
Joined: 22 Jun 2007
Posts: 187
Helped: 9
|
 12 May 2008 14:54 Third order PLL |
|
|
|
Hi all,
I need a material tutorial on third order PLLs. I need to know how to determine the Dumping factor.
Thanks in advance.
|
|
| Back to top |
|
 |
SergeyBondarev
Joined: 05 Aug 2007
Posts: 5
Helped: 1
|
| 12 May 2008 18:16 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).
|
|
| Back to top |
|
|
buckaroo
Joined: 23 Apr 2007
Posts: 34
Helped: 2
|
| 08 Jun 2008 17:03 Re: Third order PLL |
|
|
|
E best's book is the worst book i have seen
| SergeyBondarev wrote: |
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). |
|
|
| Back to top |
|
|
layes2
Joined: 03 Dec 2004
Posts: 334
Helped: 5
|
| 11 Jun 2008 10:12 Third order PLL |
|
|
|
| damping 1 is best
|
|
| Back to top |
|
|
trayant
Joined: 28 Jun 2008
Posts: 4
|
| 28 Jun 2008 13:04 Third order PLL |
|
|
|
can refer to B.Razavi book..
Monolithic Phase-Locked Loops and Clock Recovery Circuit
|
|
| Back to top |
|
|
