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Original Message
RE: PLLXO question related to LDRse
Posted by Davey on February 26, 2012 at 13:03:15:
You have to consider/include 'everything' when designing PLL's. :) Even interconnect capacitance might be an issue.
You can measure output resistance of a source fairly easily. Take a voltage measure unloaded and also with a 1k resistor attached.
Rout = 1000 times (Ropen-Rload)/Rload
You'd be surprised how high the source resistance is on many components.
Cheers,
Dave.