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about PLL acquisition range and tracking range...
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super



Joined: 18 Aug 2002
Posts: 109
Post31 Aug 2009 13:27   

acquisition range
Dear all:
In satellite PLL,
what is difference between acquisition Frequency range and
tracking Frequency range?

Thanks.
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biff44



Joined: 24 Dec 2004
Posts: 1833
Helped: 244
Location: New England, USA
Post31 Aug 2009 15:46   

pll tracking range and acquisition range
tracking range is wider than acquisition range, usually.
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LvW



Joined: 07 May 2008
Posts: 1465
Helped: 242
Location: Germany
Post31 Aug 2009 15:52   

site:www.edaboard.com pll
super wrote:
Dear all:
In satellite PLL,
what is difference between acquisition Frequency range and
tracking Frequency range?
Thanks.


As indicated by the words:
- tracking range is the frequency range which can be "tracked" by the locked PLL without loosing lock;
- acqu. range is the range in which the PLL can acquire lock (if it is out of lock),

(as BIF44 said: the first is much larger)
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super



Joined: 18 Aug 2002
Posts: 109
Post01 Sep 2009 15:47   

tracking and lock range of the pll
1. It means tracking range is a lock-in range and
acquisition range is a Hold-in(capture) range ?

2. if I set frequency from lowest frequency
to highest frequency it will lock , is it a lock-in
range ?

3 How to set and measure capture range?

4. Why tracking range is large than acquisition range ?

5. What factor effect these two terms?
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LvW



Joined: 07 May 2008
Posts: 1465
Helped: 242
Location: Germany
Post02 Sep 2009 8:26   

tracking frequency of pll
super wrote:
1. It means tracking range is a lock-in range and
acquisition range is a Hold-in(capture) range ?

2. if I set frequency from lowest frequency
to highest frequency it will lock , is it a lock-in
range ?

3 How to set and measure capture range?

4. Why tracking range is large than acquisition range ?

5. What factor effect these two terms?


One should be careful with wording as different names are used frequently.
For my opinion the following is true:
1.) Tracking range identical to hold range (loop is and remains in-lock) and
acquisition range is identical to pull-in range (loop is unlocked, lock-in possible within pull-in time)
2.) This is the pull-in range. (Lock-in range means: Quick Lock-in within one beat cycle)

Answers to 3)...5) require much more detailed explanations/formulas. Try to find and read a good book.
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Post02 Sep 2009 8:26   

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super



Joined: 18 Aug 2002
Posts: 109
Post02 Sep 2009 16:57   

acquire pll track
LvW, could you kindly recommand some PLL textbook ?
i have one roland E. Best "Phase-Locked Loops",
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