Fundamentals-of-Microelectronics-Behzad-Razavi.pdf

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

Info icon This preview shows pages 434–437. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Image of page 434

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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.
Image of page 435
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.
Image of page 436

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 437
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern