I have I question about PLL.

Let’s say I have two different input signals with different phase but the same frequency. Both signals are getting compared by a phase detector (type one or two) inside a PLL with the internal frequency provided by the VCO.

Am I right that the time to trim (lock) the internal frequency to the input frequency depends on the phase of the input signal?

Regards,

Juri

 

Not exactly, has a lot to do with filter design used.

Here is a calc for one type of filter -

https://www.google.com/url?sa=t&rct...nprocess.pdf&usg=AOvVaw0adx45_d4KupD1xks87hN1

https://www.google.com/url?sa=t&rct...SSCC2004.pdf&usg=AOvVaw3wSf8n3ZVMSJUM8_C_Ijft

There is a book by Gardner on PLLs that is quite useful, as well as many application
notes on the web.



Regards, Dana.