Re: PLL locking problem

Sounds like you missed out the low pass filter between PD and VCO.


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!