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electronicslab8

electronicslab8 - point C and point E with the scope We...

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Taylor Edgens EE 2231 November 4, 2009 Lab # 8 Partner: Arthur Mason Introduction
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In Electronics Lab 1, we are working on our 8 th experiment which we will be studying the characteristics of bipolar transistors. Objectives The objective in our lab was to characterize an npn bipolar transistor and to measure the dc operating point of a single-transistor amplifier. We also had to measure the ac performance of the single-transistor amplifier. Procedures We were first told to connect the circuit in Figure 1, and to use the potentiometer to vary the voltage at the input from 0 V to 10 V in 1 V increments. Then, record the voltage at point B and the voltage at point C. Next, we need to connect the circuit shown in Figure 2, this time without connecting the potentiometer to the circuit and observe. Now, connect the potentiometer and use it to apply 0 V to 1 V to point B in 0.1 V increments. Measure the voltages at point C and point E. Then, we had to disconnect the potentiometer and apply a 2 V p-p signal at 1 kHz to point B, observing
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Unformatted text preview: point C and point E with the scope. We also had to apply a small signal much less than 0.1 V p-p to the input and observe the signal at point C. Finally, we needed to vary the input frequency to find a lower frequency where the gain drops to 0.71 of its high-frequency value. Analysis 1) V-in V-B V-C 0.00 10.0 1 0.46 9.90 2 0.70 7.27 3 0.70 5.30 4 0.71 3.90 5 0.71 3.18 6 0.71 2.30 7 0.71 0.98 8 0.71 0.26 9 0.71 0.20 10 0.71 0.20 2) V C E 0.0 5.51-0.72 0.1 5.44-0.66 0.2 5.36-0.59 0.3 5.29-0.51 0.4 5.18-0.44 0.5 5.08-0.38 0.6 4.97-0.27 0.7 4.90-0.19 0.8 4.75-0.09 0.9 4.72 0.10 1.0 4.58 0.25 Based on the waveforms from the Figure 2, the gain of the circuit from the input to point E was about 1.44 V. The gain of the circuit from the input to point C was about 1.60 V. After applying a small signal much less than 0.1 V p-p to the circuit, we determined that the gain from the input to point C now was around 11.0 V. Assignment Conclusion...
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