Lab 3 Writeup - Albert Ho ECE 315 Tuesday lab Lab 03...

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Albert Ho ECE 315 Tuesday lab Lab 03 writeup Objective: The purpose of this lab was to gain a solid understanding of the workings of the Bipolar Junction Transistor (BJT). We explored certain topics such as obtaining the transistor’s output and transfer characteristics, as well as the transconductance and current gain β. PSPICE was one of the major tools used in this lab for simulation. Equipment: PSPICE software (use of program’s Q2N3094 NPN transistor in simulation) PC – Keithley CTrace software 2 Keithley SMU’s (Source Measurement Units) - denotation: SMU1 is for sweeping, and SMU2 is for stepping CA3046 IC (contains 3 standalone NPN Bipolar Junction Transistors, and a differential pair) CA3096C IC (contains 5 standalone PNP Bipolar Junction Transistors) 1 μF capacitor Breadboard + associated wires Experimental Results: Setup We began by setting the CA2046 DIP on the breadboard and connecting SMU1 to the collector of Q1 (for sweeping) and SMU2 to the base of Q1 (for stepping). The emitter was then grounded. We then connected the collector and emitter with an electrolytic 1 μF capacitor. This was essentially a simple filter for removing 60 Hz interference. Obtaining the NPN Bipolar Junction Transistor’s IV curves This first experiment was done to obtain the NPN BJT’s IV curves. More specifically, we were to obtain a graph of collector current I c vs. the collector to emitter voltage V CE . This would be done while stepping the base current I B to obtain a family of IV curves for the collector characteristics. We performed a voltage sweep on the collector voltage V CE from 0 to 5 V. While doing this, we also stepped the base current from 0 to 10 μA in 2 μA steps. The following is the NPN transistor’s IV curves we obtained:
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Figure A: NPN Bipolar Junction Transistor IV curves The graph above is plotted on axes of collector current I C in amperes, versus collector voltage V CE in volts. As can be observed, stepping base current I B produced a family of IV curves, each of which is denoted by color. Obtaining the NPN Bipolar Junction Transistor’s transfer and output characteristics In this experiment we kept the collector voltage V CE constant at 5 Volts. On CTrace, we accounted for the fact that this experiment consisted of relatively low level measurements, and as a result we increased the NPLC parameter to 10 and the delay parameter to 0.1 (causes the measurement time to be relatively long). We logarithmically swept the base current I B from 0.1 μA to 1 mA with about 100 points.
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