ECE302 - Lab3

ECE302 - Lab3 - Camry Simpson Laboratory Report 3 9/21/2010...

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Camry Simpson Laboratory Report 3 9/21/2010
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Introduction In this lab we are introduced to Bipolar Junction Transistors (BJTs). We will determine I C -V CE characteristics of BJTs in several regions of operation. As well, in this lab, we will derive the large signal model for the BJT in a single region of operation. 2.0 Prelab Here we derived the simplified equations appropriate for the Forward Active region. 2) i C = I S [exp(V BE /V T ) - exp(V BC /V T )] - I S R [exp(V BC /V T ) - 1] i C = I S exp(V BE /V T ) + I S R ≈ I S exp(V BE /V T ) i E = I S [exp(V BE /V T ) - exp(V BC /V T )] - I S F [exp(V BE /V T ) - 1)] i E = I S [exp(V BE /V T ) + I S F [exp(V BE /V T ) - 1)] ≈ I S F exp(V BE /V T ) i B = I S F [exp(V BE /V T ) - 1] + I S R [exp(V BC /V T ) - 1)] i B = I S F [exp(V BE /V T ) - 1] - I S R ≈ I S F [exp(V BE /V T ) 3) We then built the following circuit in PSPICE and performed a nested sweep, creating the family of curves representing the I C -V CE curves. The first curve is the I C -V CE representation with β F = 50. The second curve is the I C -V CE representation with β F = 150. @ +bf = 50 @ +bf = 150 3.0 Procedure 3.1 Measuring I-V characteristic with 4155C Here we were first introduced to a BJT and explained the “polarities” of both the npn and pnp. Using the 4155C, we hooked it up and retrieved the IC-VCE representation for I B = 0, 2, 4, 6, 8, and 10 μA with the npn, and I
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This note was uploaded on 01/28/2012 for the course ECE 302 taught by Professor Barlage during the Fall '07 term at N.C. State.

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ECE302 - Lab3 - Camry Simpson Laboratory Report 3 9/21/2010...

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