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Experiment B - Experiment B Biasing EE348-02 Jeff Gerfen...

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Experiment B: Biasing October 10, 2006 EE348-02 Jeff Gerfen Partners: Jessica Kiefer Sean Kregness
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Procedure XA1/XA2: In this portion of the experiment, we examined the current mirror using reference currents of 0.1mA and 1mA while varying the load (by changing V CC2 ) to span significant portions of the forward active and saturation regions. The data is below in Table 1. For i C = 0.1mA V RL (V) I C2 (mA) V CE2 (V) V CC2 (V) 5.5 0.117 12.02 17.6 5.41 0.115 9.36 14.8 5.36 0.0114 8.03 13.45 5.3 0.112 6.16 11.5 5.22 0.111 4.49 9.7 5.2 0.11 3.2 8.4 5.1 0.108 1.99 7.1 5.03 0.107 0.8 5.87 4.48 0.0949 0.086 4.57 3.39 0.0718 0.049 3.44 2.4 0.058 0.032 2.5 For i C = 1mA V RL (V) I C2 (mA) V CE2 (V) V CC2 (V) 5.7 1.14 12.4 18.2 5.7 1.14 11.1 16.7 5.6 1.12 9.8 15.4 5.5 1.1 7.9 13.4 5.45 1.09 7.08 12.5 5.31 1.062 4.68 10.01 5.24 1.048 3.28 8.5 5.138 1.028 1.76 6.9 5.05 1.01 0.71 5.76 4.12 0.824 0.118 4.2 2.6 0.52 0.061 2.7 Table 1: Raw data for i C = 0.1mA and i C = 1mA.
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Using the data on the previous page, we were able to graph I C vs V CE . They are shown below in Figure 1. Ic vs Vce 0 0.0002 0.0004 0.0006 0.0008 0.001 0.0012 0 2 4 6 8 10 12 14 Vce (V) Ic (A) 1 mA .1 mA Figure 1: Ic vs. Vce It is important to note that it was much easier to set V CC to slightly above 10V in order to obtain the exact .1mA and 1mA across R REF . By doing this, we were still able to obtain
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