Question

Question 1 Consider the following circuit, where the reverse saturation current (Is) is the same for each diode. D2 o Vo Di Vi WWW R 32 23 a. b. Determine an algebraic expression for V1, for a given Vo, and Is. Given an Is of 40 FA and R1 = 3.3 kl , determine the Vi that produces an output voltage (V.) of 0.625 V. C. Recalculate question-b if Is were to be a thousand times greater at 40 pA. Compare the results. d. e. Repeat question-b using the CVD diode model with Vp(on) = 0.625 V. Compare the results. Add a source resistance (Rs) in series with Vi, and change V; to 9 V DC. Use the CVD model to ascertain the value of Rs to make the current through D3 is exactly one third of that through the resistor. Again, use Vo(on) = 0.625 V. Recalculate question-e for Vo(on) = 0.65 V, and again for Vo(on) = 0.7 V. Compare the results. Adapted from "Microelectronics" (4th ed.), D.A.Neamen, Mc Graw Hill Education, Question 1.42, page 61 and question 1.50, page 63.

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Answer 1

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