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ECE 206 - Write-up Lab 8

# ECE 206 - Write-up Lab 8 - Introduction to Bipolar Junction...

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Introduction to Bipolar Junction Transistor Circuits Experiment #8 Question 1: From your data in Part A, propose a possible model for a bipolar junction transistor using known electrical components (e.g. diodes, voltage and current sources, etc.). [Note: Don’t just regurgitate some of the models you’ve encountered in ECE 205. Use only the data in Part A.] By observing the characteristics in the evaluated table the following is a proposed model for a bipolar junction transistor. Question 2: From you data in Part B, construct a table giving, for each in V , the values for out V , R V , B I , C I , and B C I I / . Constructing a table giving the desired quantities is as follows. V in [Volts] V out [Volts] V R [Volts] I B [mAmps] I C [mAmps] I C /I B [Unitless] 0.3 4.993 0 0 0.016276704 0.4 4.993 0 0 0.016276704 0.5 4.984 0.00009 9.00901E-05 0.02543235 282.2990844 0.525 4.966 0.00018 0.00018018 0.043743642 242.7772126 0.55 4.924 0.004 0.004004004 0.08646999 21.59587996 0.575 4.878 0.00064 0.000640641 0.133265514 208.0191378 0.6 4.684 0.00165 0.001651652 0.330620549 200.1757144 0.625 4.467 0.00278 0.002782783 0.551373347 198.1374006 0.65 3.676 0.00689 0.006896897 1.356052899 196.6178297 0.675 2.47 0.01317 0.013183183 2.582909461 195.9245673 0.7 0.581 0.02363 0.023653654 4.504577823 190.4389863 0.725 0.188 0.04541 0.045455455 4.904374364 107.894076 0.75 0.157 0.06921 0.069279279 4.935910478 71.24656217 0.775 0.14 0.09452 0.094614615 4.953204476 52.35136766 0.8 0.131 0.11721 0.117327327 4.962360122 42.29500693 Showing the evaluation of each quantity with an example is as follows. Volts for Variable V in 65 . 0 = . 89 . 6 & 676 . 3 & ly respective mVolts Volts values measured V V R out = B R B R V I = , where mAmps k mVolts I k R B B 006896 . 0 999 . 0 89 . 6 999 . 0 = = = C out C C R V V I - = , where mAmps k Volts Volts I Volts V k R C C C 356 . 1 983 . 0 676 . 3 009 . 5 009 . 5 & 983 . 0 = - = = = ECE 206 Mauro Rodriguez

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Introduction to Bipolar Junction Transistor Circuits Experiment #8 Question 3: Graph out V as a function of in V , identifying-on the graph-the transistor’s operation regions (cutoff, forward active, and saturated).
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