eejli
Advanced Member level 4
Hi Guys,
How are you doing?
I am debugging my folk's CDR. The CDR can initially locked to the TX data in the right frequency, say 3 GHz. But after 20 seconds, the CDR lose of lock and lock to another frequency, say 2.97 GHz. After adjusting the CDR's VCO's tuning curve, the vco has multiple turning curves to choose. The CDR can return to locking.
I do not understand what is causing the problem. Changing the VCO curve is changing the Kvco,
is it meaning the CDR has linear stability problem? Any other possible reasons?
Thanks.
How are you doing?
I am debugging my folk's CDR. The CDR can initially locked to the TX data in the right frequency, say 3 GHz. But after 20 seconds, the CDR lose of lock and lock to another frequency, say 2.97 GHz. After adjusting the CDR's VCO's tuning curve, the vco has multiple turning curves to choose. The CDR can return to locking.
I do not understand what is causing the problem. Changing the VCO curve is changing the Kvco,
is it meaning the CDR has linear stability problem? Any other possible reasons?
Thanks.