{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

ee2002lab4

# ee2002lab4 - Creating I-V Curves and Load Line Calculation...

This preview shows pages 1–3. Sign up to view the full content.

Creating I-V Curves and Load Line Calculation Matthew Beckler [email protected] EE2002 Lab 003 March 6, 2006 Abstract As an introduction to non-linear circuit devices, the electrical prop- erties of both an incandescent lamp and silicon diode are investigated. Using a load-line analysis, the operating current is calculated and verified for the lamp. The silicon diodes are used in a variety of arrangements to produce different clipping circuits. 1 Introduction In the world of electric circuit analysis, linear devices are wonderful. They permit the use of many important solution methods, such as Kirchhoff’s two laws, the node-voltage and mesh-current methods, and the super-positioning principle. A system of linear devices is so well-behaved that man circuits can be reduced down to a Thevenin or Norton equivalent circuit, greatly simplifying subsequent calculations. Unfortunately, many common devices are classified as ‘non-linear‘ devices. Unless simplifying assumptions are made, circuits involving these non-linear devices are much more difficult to analyze. For simple non- linear circuits, such as a light bulb or LED circuit, we can use a method known as ‘load-line‘ analysis to find the circuit’s operating parameters. For other non- linear devices, such as a silicon diode, we can use a function generator and oscilloscope to observe a circuit’s effect on an input signal. Using the special, non-linear properties of these diodes, a number of interesting modifications can be performed on a signal, mostly in the way of clipping the input voltage at a specific level. 1

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

View Full Document
2 Experiments 2.1 Current Versus Voltage Relationship The first step in conducting a load-line analysis is to obtain the raw current versus voltage relationship for the device in question, here, an incandescent lamp. The circuit was constructed as such: Figure 1: Circuit Schematic - Experiment 1 The voltage was varied in two volt increments between 2 and 60 volts. The measured current is summarized in the following table: Voltage (V) Current (mA) Voltage (V) Current (mA) 2 4.3 32 21.1 4 6.3 34 21.9 6 7.8 36 22.7 8 9.2 38 23.4 10 10.5 40 24.2 12 11.7 42 24.9 14 12.8 44 25.6 16 13.8 46 26.3 18 14.9 48 27.0 20 15.9 50 27.7 22 16.8 52 28.4 24 17.7 54 29.0 26 18.6 56 29.7 28 19.5 58 30.3 30 20.3 60 30.9 A chart of the previous data is useful to observe the behavior of the device in response to various input voltages, and is included on the next page of this document. The current values appear to be levelling-off as the voltage continues to increase linearly. If this trend continues, the device will reach an upper-limit to the current it will allow. This chart is very important in calculating the load-line operating current and voltage. This is calculated in the next section.
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• 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.

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

• 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.

Dana University of Pennsylvania ‘17, Course Hero Intern

• 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.

Jill Tulane University ‘16, Course Hero Intern