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Unformatted text preview: Spring 2007 6.720J/3.43J Integrated Microelectronic Devices Prof. J. A. del Alamo Device Characterization Project 3 - April 11, 2007 npn BJT characterization Due: April 27, 2007 at lecture In this project, you will characterize the current-voltage characteristics of an npn bipo- lar junction transistor (BJT). To do this, you will use our online microelectronics device characterization laboratory. Refer to the User Manual for instructions on how to use the system. The BJT to be characterized is labeled 2N3904. The terminal connection configuration is available on line. This exercise involves three separate phases: (i) measurement and graphing, (ii) model parameter extraction, and (iii) comparison of model with measure- ments. Take the measurements specified below. When you are happy with the results (as judged by the characteristics displayed through the web), download the data to your local machine for more graphing and further analysis. You will find useful to study the contents of Appendix A which describes the ideal model for the I-V characteristics of an npn BJT. Important note: For all measurements, hold V BE (or V BC ) between 0 and 0 . 9 V , and V CE between 0 and 4 V . Here is your assignment. 1. ( 10 points ) Measure and download the common-emitter output characteristics of the BJT. This is a plot of I C (linear scale) vs. V CE (linear scale) with I B as parameter for positive V CE . Do this for 0 I B 100 A and 0 V CE 4 V . In your local machine and using your favorite software tool, graph the output characteristics. Turn in a printout of this graph (graph 1) . 2. ( 10 points ) Measure and download the common-emitter transfer characteristics of the BJT in the forward active regime (also known as Gummel plot ). This is a semilog plot of I C and I B (logarithmic scale) vs. V BE (linear scale). Do this for V CE = 2 . 5 V . In your local machine graph the Gummel plot. Turn in a printout of this graph (graph 2) . In a separate plot, graph the current gain of the bipolar transistor vs. I C . This is a semilog plot of F = I C /I B (linear scale) vs. I C (logarithmic scale). The lower end of the I C scale should be I C = 10 7 A . Turn in a printout of this graph (graph 3) ....
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- Spring '07