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Step of 5 3.026P Write the expression for junction capacitance. α Here, the value of constant a is, Substitute A for a in the equation. ND 9 (1) Step of 5 Write the expression for width of the depletion 1 1 W q N W Step of Substitute for in equation (1). q 2 = W As, Thus, the expression for junction capacitance for a parallel-plate capacitance, W Step of Alternate method: Write the expression for junction capacitance. (2) Here, is the reverse voltage. is the junction capacitance at zero reverse bias. D Step of Substitute A for in equation (2). 2 A 2 N 2 N Substitute for in the equation. A 2 N A 2 N = N W Thus, the expression for junction capacitance for a parallel plate capacitance, is W