Sample I-O - Sample input and output impedance problem Find...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Sample input and output impedance problem: Find the input impedance seen by the voltage source, and find the output impedance. Input impedance: Since the question asks to find the impedance seen by the source, we would take the source out, and find the impedance between those terminals (i.e. the 2 terminals where the source used to be). Then the technique would be to apply a source to those terminals (say Vin), and find the current through the source (say Iin), then the input impedance would be Vin/Iin. If we apply a known Vin, the problem is basically to find Iin. In this case, that would be the current through the left-hand 5 Ohm resistor. In order to find that current, we would “solve” the op amp problem with our standard techniques, and find the voltage at the + input terminal in order to find the required resistor current. In this particular problem, since there are no independent sources in the circuit, we could actually apply any voltage source (even the 5V as shown), and get the same answer, i.e. the answer
Image of page 1
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