Lab3.docx - Electronics Lab Lab 3 Silicon Diodes...

This preview shows page 1 - 2 out of 8 pages.

Electronics Lab 9/18/17 Lab 3: Silicon Diodes Introduction In this lab, we studied different circuits involving silicon diodes. Specifically, we observed their characteristics and applications in certain circuits. Theory Diodes are physically marked with a minus sign at the cathode, which signifies their negative side. Different terms used to describe a diode are crude, standard, and theoretical. Crude is when a diode acts as a short circuit, standard is when a diode acts as a 0.7V source, and theoretical is when the current can be described as I=I o (e V/kT -1). In this equation, k is Boltzman’s constant, T is the absolute temperature, and I o is the leakage current. The resistance of the diode can be described as r d =δV/δI. In this equation, δV and δI are the small changes made in the voltage and current in the diode. Experiment First, we connected the circuit in Fig. 1, applying different voltages between -10V and +10V. We decided to increment these voltages by 1V each to get 20 different readings, and monitor the progression of the voltage between the resistor and the silicon pn diode. The positive side of the diode was connected to the V in . This
Image of page 1

Subscribe to view the full document.

diode ran in series with a 1kΩ resistor, which was connected to ground. We measured V out at the terminal where the diode and resistor connected. Next, we assembled the circuit in Fig. 2, applying voltages measuring from -10V to +10V. Similarly, we incremented the voltage by 1V to create 20 different readings. Unlike Fig. 1, the resistor and the diode had their positions switched. In this case, the resistor was connected to V in , and the diode was connected to ground. Similarly, the resistor and diode were also in series in this test. We measured V out in the same location as Fig. 1, at the terminal between the resistor and the diode. Finally, we connected the “limiter” circuit of Fig. 3, and applied voltages ranging from -2V to +2V. We incremented voltages by 0.2V in this experiment. In this experiment, the resistor was connected to the voltage
Image of page 2
You've reached the end of this preview.
  • Spring '08
  • Staff

{[ 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