Use Eq. (8.88) to show that for a BJT cascode current source utilizing identical pnp

Chapter 8, Problem 8.77

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Use Eq. (8.88) to show that for a BJT cascode current source utilizing identical pnp transistors and supplying a current I, IRo = VA VT VA +(1/) Evaluate the figure-of-merit IRo for the case VA = 5 V and = 50. Now find Ro for the cases of I = 0.1, 0.5, and 1.0 mA.

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