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hw9_solution

# hw9_solution - Chapter 5 Problem 8 Obtain vo for each of...

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1 Chapter 5, Problem 8. Obtain v o for each of the op amp circuits in Fig. 5.47. Chapter 5, Solution 8. (a) If v a and v b are the voltages at the inverting and noninverting terminals of the op amp. v a = v b = 0 1mA = k 2 v 0 0 v 0 = -2V (b) Since v a = v b = 1V and i a = 0, no current flows through the 10 k resistor. From Fig. (b), -v a + 2 + v 0 = 0 v 0 = v a - 2 = 1 - 2 = -1V Figure 5.47 for Prob. 5.8 - + - + 1V - + 2V 10 k 2 k i a v b v a + v o - (a) + v o - i a (b) 10 k + v a - + - 2V

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2 Chapter 5, Problem 10. Find the gain v o /v s of the circuit in Fig. 5.49. Chapter 5, Solution 10. Since no current enters the op amp, the voltage at the input of the op amp is v s . Hence v s = v o 2 v 10 10 10 o = + s o v v = 2 Figure 5.49 for Prob. 5.10
3 Chapter 5, Problem 13. Find v o and i o in the circuit of Fig. 5.52. Chapter 5, Solution 13. By voltage division, v a = V 9 . 0 ) 1 ( 100 90 = v b = 3 v v 150 50 o o = But v a = v b 9 . 0 3 v 0 = v o = 2.7V i o = i 1 + i 2 = = + k 150 v k 10 v o o 0.27mA + 0.018mA = 288 µ A i o + 50 k + v o 10 k 100 k 1 V + a b 10 k 90 k i 2 i 1

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4 Chapter 5, Problem 20. In the circuit in Fig. 5.59, calculate v o if v s = 0. Figure 5.59 Chapter 5, Solution 20. At node a, 4 v v 8 v

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hw9_solution - Chapter 5 Problem 8 Obtain vo for each of...

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