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[SOLVED] Confusing about colppits oscilator

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Sorry, but I doubt that you "see everywhere" for the Colpitt type the formula as given with your 2nd link.
Instead, the formula as given in the pdf doc is correct.

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formula in your 2nd link is used for negative feedback. which is basic requirement for oscillation.(for constant gain)
 

could you tell more about uday mehta? how it is possible that we have oscillation with negative feedback?
 

They are the same, provided that C is the series of C1 with C2 (C=C1*C2/(C1+C2) and of course Wx=2*pi*f0.

Z
 
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sorry
I had a mistake.
both answers are correct.
in your pdf W is given. and w=2*pi*f
in your second link c=(1/c1+1/c2)
 
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