12.21 For the class AB output stage considered in Example 12.4, add two columns to the table of results as follows: the total input current drawn from vI (iI, mA); and the large-signal input resistance Rin ≡ vI/iI. Assume βN = βP = β = 49. Compare the values of Rin to the approximate value obtained using the resistance-reflection rule,
Rin-BRL.
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