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If 1/h12 = 10 for a C.E. stage, what is the value of the base to collector capacitance, after Miller multiplication, at the output side?(a) 1.1Cµ(b) 1.2Cµ(c) 2.1Cµ(d) 2.2CµI got this question during a job interview.My question comes from Effect of Various Capacitors on Frequency Response topic in portion Transistor Frequency Response of Analog Circuits

Answer»

Right choice is (a) 1.1Cµ

The BEST explanation: At the output SIDE of a C.E. stage, Cµ gets multiplied by a FACTOR of (1+1/Av) where Av is the voltage gain. 1/h12 is nothing but Av. Hence, the VALUE CHANGES to 1.1Cµ.



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