Is 50% duty cycle important for PLL design?

[vijaykarnam]

Hi all,

I am designing a pll. in that, as u all know, in feedback loop divide by N counter is required. For that 50% duty cycle is important or not? and why?

thanks
Vijay

 

[wwwww12345]

Re: Regarding Pll

I think it is not important, for PFD only compares the phase of the input ,so the duty cycle is not of concern.

 

[dinesh agarwal]

Regarding Pll

the comparision is on the basis of leading edges of the reference fre and the feedbach(Div ) fre

hence duty cycle readlly does not matter

the slope or the transient time is important instead of duty cycle

hope got it

 

[khouly]

Regarding Pll

yeah the PFD is sensitive to the phase of the inputs

khouly

 

[rajanarender_suram]

Regarding Pll

Pfd compares wrt to the rising edges of the inputs so the duty cycle is not important

 

[dinesh agarwal]

Regarding Pll

comparision is on rising or falling edges

can someone clarify