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Step of 5 8.015E Consider the expression for the output resistance of the Common Base amplifier. Substitute 0 for R, =r. Therefore, the expression for the output resistance at R, = 0 ro Step of 5 Recall equation (1). Substitute for R, and 11 for Here, Hence, both terms and are equal to Therefore, the expression for the output resistance at R, =r, is Step of 5 Recall equation (1). Substitute for R, Here, the term is equal to Therefore, the expression for the output resistance at is Step of Recall equation (1). Substitute ro for R, Here, Here, the term is equal to Therefore, the expression for the output resistance at R, is Step of Recall equation (1). =r+ =r+ As it implies Here, the term is equal to B Therefore, the expression for the output resistance at R, is