The transition capacitance, CT of a PN junction having uniform doping in both sides, varies with junction voltage as________(a) (VB )^1/2(b) (VB )^-1/2(c) (VB )^1/4(d) (VB )^-1/4This question was addressed to me in final exam.Query is from Diode Capacitances topic in portion Semiconductor-Diode Characteristics of Electronic Devices & Circuits

The transition capacitance, CT of a PN junction having uniform doping

1.	The transition capacitance, CT of a PN junction having uniform doping in both sides, varies with junction voltage as________(a) (VB )^1/2(b) (VB )^-1/2(c) (VB )^1/4(d) (VB )^-1/4This question was addressed to me in final exam.Query is from Diode Capacitances topic in portion Semiconductor-Diode Characteristics of Electronic Devices & Circuits
Answer» Right choice is (b) (VB )^-1/2 Explanation: CT = K/(V0+VB)^1/2 As it’s having uniform doping on both SIDES, the VOLTAGE V0 will be zero. So, CT=K/(VB)^1/2. The variation of TRANSITION capacitance with built in capacitance is (VB )^-1/2.

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