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Design >> Analog Design >> Natural Frequency of 2nd order PLL
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Message started by raja.cedt on Dec 5^th, 2011, 1:48pm

Title: Natural Frequency of 2nd order PLL
Post by raja.cedt on Dec 5^th, 2011, 1:48pm

hello all,
Can any one please explain what is the purpose of natural frequency (wn, constant term in 2nd order standard Characteristic equation ), because all dynamics will be controlled by loop bw, which has no relation with wn.

Thanks,
Raj.

Title: Re: Natural Frequency of 2nd order PLL
Post by loose-electron on Dec 5^th, 2011, 3:06pm

Wn (or Wo, dpends on paper) are the same thing.

Generally a 2nd order PLL can be described in terms of Wn and Zeta

Title: Re: Natural Frequency of 2nd order PLL
Post by raja.cedt on Dec 6^th, 2011, 1:54am

hello,
yes i know that, but only loop bw play role, for a second order it is equal to icp*kvco*r1/n...

Thanks,
raj.