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Colpitts oscillator formula

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matusel

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Hello boys, can someone tell me how to obtain frequency formula in a colpitts oscillator like this?

Colpitts.png
 

It's said in the words below the formula
where the series combination of C1 and C2 creates the effective capacitance of the LC tank

You also need to understand total capacitance of series connected capacitors and resonance frequency of a LC circuit LC circuit - Wikipedia, the free encyclopedia
 

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