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We have a capacitor from the collector to substrate, Ccs, which comes in parallel to the miller approximation of the capacitance from base to collector. The miller approximation defines the latter as Cµ*(1 + 1/gm*R2). Since capacitors gets added, when in parallel, the correct option is Ccs + Cµ*(1+ 1/gm*R2).

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We have a capacitor from the collector to substrate, C<sub>cs</sub>, which comes in parallel to the miller approximation of the capacitance from base to collector. The miller approximation defines the latter as C<sub>µ</sub>*(1 + 1/g<sub>m</sub>*R<sub>2</sub>). Since capacitors gets added, when in parallel, the correct option is C<sub>cs</sub> + C<sub>µ</sub>*(1+ 1/g<sub>m</sub>*R<sub>2</sub>).






 
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