# R in1 in2 a v v in1 v v in2 out v in figure 843 what

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R in1 in2 A 0 V V in1 V ( V in2 ) out V in Figure 8.43 What happens if ? 7. A noninverting amplifier employs an op amp with a finite output impedance, . Rep- resenting the op amp as depicted in Fig. 8.44, compute the closed-loop gain and output in1 in2 A 0 V V in1 V ( V in2 ) out V R out Figure 8.44 impedance. What happens if ? 8. In the noninverting amplifier shown in Fig. 8.45, resistor deviates from its nominal value V in A 0 out V V V in1 in2 R 1 R 2 Figure 8.45

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BR Wiley/Razavi/ Fundamentals of Microelectronics [Razavi.cls v. 2006] June 30, 2007 at 13:42 410 (1) 410 Chap. 8 Operational Amplifier As A Black Box by . Calculate the gain error of the circuit if . 9. The input/output characteristic of an op amp can be approximated by the piecewise-linear behavior illustrated in Fig. 8.46, where the gain drops from to and eventually to out V in1 V V in2 A 0 A 0 0.8 +2 mV +4 mV 4 mV 2 mV Figure 8.46 zero as increases. Suppose this op amp is used in a noninverting amplifier with a nominal gain of 5. Plot the closed-loop input/output characteristic of the circuit. (Note that the closed-loop gain experiences much less variation; i.e., the closed-loop circuit is much more linear.) 10. A truck weighing station incorporates a sensor whose resistance varies linearly with the weight: . Here is a constant value, a proportionality factor, and the weight of each truck. Suppose plays the role of in the noninverting amplifier (Fig. 8.47). Also, V. Determine the gain of the system, defined as the change in A 0 out V R 1 R S V =1 V in Figure 8.47 divided by the change in . 11. Calculate the closed-loop gain of the noninverting amplifier shown in Fig. 8.48 if . Verify that the result reduces to expected values if or . V in A 0 out V R 1 R R R 4 3 2 Figure 8.48 12. An inverting amplifier must provide a nominal gain of 8 with a gain error of . Determine the minimum required op amp gain. 13. The op amp used in an inverting amplifier exhibits a finite input impedance, . Modeling the op amp as shown in Fig. 8.43, determine the closed-loop gain and input impedance.
BR Wiley/Razavi/ Fundamentals of Microelectronics [Razavi.cls v. 2006] June 30, 2007 at 13:42 411 (1) Sec. 8.6 Chapter Summary 411 14. An inverting amplifier employs an op amp having an output impedance of . Modeling the op amp as depicted in Fig. 8.44, compute the closed-loop gain and output impedance. 15. An inverting amplifier must provide an input impedance of approximately 10 k and a nom- inal gain of 4. If the op amp exhibits an open-loop gain of 1000 and an output impedance of 1 k , determine the gain error. 16. An inverting amplifier is designed for a nominal gain of 8 and a gain error of using an op amp that exhibits an output impedance of 2 k . If the input impedance of the circuit must be equal to approximately 1 k , calculate the required open-loop gain of the op amp. 17. Assuming , compute the closed-loop gain of the inverting amplifier shown in Fig.

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