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Step of 4 8.014E Consider the expression for the input resistance of the Common Base amplifier. (1) Substitute 0 for ro =r, Therefore, the expression for the input resistance at = 0 is Step of 4 Recall equation (1). Substitute for Here resulting Therefore, the expression for the input resistance at = is 2r, Step of 4 Recall equation (1). Substitute for 2 = 2 Here resulting to Here, the expression is equal to 2 Therefore, the expression for the input resistance at = is 2 Step of 4 Recall equation (1). =r, As implies 0+1 Here, the expression is equal to Therefore, the expression for the input resistance at is