The circuit shown in Figure 11.48 is an ac equivalent circuit of a Darlington pair output...
The circuit shown in Figure 11.48 is an ac equivalent circuit of a Darlington pair output stage. Assume the transistor current gains are βA = 90 and βB = 180. Assuming transistor QB is biased at ICQB = 0.5 mA, determine the output resistance Ro.
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