Re: PLL locking problem

I am using a RC low pass filter, which is followed by a source follower.

Jim Thompson <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>...
> On 1 Dec 2003 08:45:29 -0800, [EMAIL PROTECTED] (cici) wrote:
> 
> >My PLL can not lock. I am using an Xor gate as the PD. And the VCO is
> >cross coupled VCO. Now the control voltage is in the tuning voltage
> >range of VCO, but it is an oscillation the same frequency as the
> >output of the PD. It should be a DC voltage when the PLL is locked.
> >What can be the problem? Thanks!
> 
> And your loop filter is what?
> 
>                                         ...Jim Thompson
> -- 
> |  James E.Thompson, P.E.                           |    mens     |
> |  Analog Innovations, Inc.                         |     et      |
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