In a simple follower stage, C2 is a parasitic capacitance arising due to the depletion region between the collector and the substrate. What is the value of C2?(a) 0(b) Infinite(c) Ccs(d) 2*CcsThe question was asked by my college professor while I was bunking the class.This intriguing question originated from Effect of Various Capacitors on Frequency Response topic in section Transistor Frequency Response of Analog Circuits

In a simple follower stage, C2 is a parasitic capacitance arising due

1.	In a simple follower stage, C2 is a parasitic capacitance arising due to the depletion region between the collector and the substrate. What is the value of C2?(a) 0(b) Infinite(c) Ccs(d) 2*CcsThe question was asked by my college professor while I was bunking the class.This intriguing question originated from Effect of Various Capacitors on Frequency Response topic in section Transistor Frequency Response of Analog Circuits
Answer» Right choice is (a) 0 The explanation is: During the high FREQUENCY response, the CAPACITOR between the COLLECTOR and the substrate gets shorted to A.C. GROUND at both of its terminals. HENCE, C2=0. The answer would have been Ccs for any other stage of B.J.T.

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