what's the meaning of the fourth-order type2 charge pump pll

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jerryhuang

Joined: 03 Feb 2005
Posts: 39

27 Aug 2005 18:00 what's the meaning of the fourth-order type2 charge pump pll

thanks

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eng_Semi

Joined: 03 May 2005
Posts: 339
Helped: 30
Location: Egypt

27 Aug 2005 21:13 Re: what's the meaning of the fourth-order type2 charge pump

Fourth order means that the loop filter is of 3rd order
TypeII means that the open loop response of the PLL contain two poles at s=0

jerryhuang

Joined: 03 Feb 2005
Posts: 39

28 Aug 2005 3:37 what's the meaning of the fourth-order type2 charge pump pll

thanks,does the fourth-order pll have good noise performance than third-order pll?And I still don't know the meaning of typeII or type I ?for a cppl,how can I modle the open-loop response ,does the type also depend on the loop filter transfer function?