Lab3.docx

# Lab3.docx - Electronics Lab Lab 3 Silicon Diodes...

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Electronics Lab 9/18/17 Lab 3: Silicon Diodes Introduction In this lab, we studied different circuits involving silicon diodes. Specifically, we observed their characteristics and applications in certain circuits. Theory Diodes are physically marked with a minus sign at the cathode, which signifies their negative side. Different terms used to describe a diode are crude, standard, and theoretical. Crude is when a diode acts as a short circuit, standard is when a diode acts as a 0.7V source, and theoretical is when the current can be described as I=I o (e V/kT -1). In this equation, k is Boltzman’s constant, T is the absolute temperature, and I o is the leakage current. The resistance of the diode can be described as r d =δV/δI. In this equation, δV and δI are the small changes made in the voltage and current in the diode. Experiment First, we connected the circuit in Fig. 1, applying different voltages between -10V and +10V. We decided to increment these voltages by 1V each to get 20 different readings, and monitor the progression of the voltage between the resistor and the silicon pn diode. The positive side of the diode was connected to the V in . This

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diode ran in series with a 1kΩ resistor, which was connected to ground. We measured V out at the terminal where the diode and resistor connected. Next, we assembled the circuit in Fig. 2, applying voltages measuring from -10V to +10V. Similarly, we incremented the voltage by 1V to create 20 different readings. Unlike Fig. 1, the resistor and the diode had their positions switched. In this case, the resistor was connected to V in , and the diode was connected to ground. Similarly, the resistor and diode were also in series in this test. We measured V out in the same location as Fig. 1, at the terminal between the resistor and the diode. Finally, we connected the “limiter” circuit of Fig. 3, and applied voltages ranging from -2V to +2V. We incremented voltages by 0.2V in this experiment. In this experiment, the resistor was connected to the voltage
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