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Can't solve using state variable method?

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zephy20

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So, I tried solving the above using state variable method, but I can't seem to get the capacitor equations needed to find the condition oscillation. Anyone care to guide me?

Thanks.
 

Vo1/Va(jω) * Vb/Vo1(jω) = 1 because it has positive feedback. That is the oscillation condition.
 

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