It is a lab experiement of PHY course (Cercuit Theory). Here is what I did: Part

Question

It is a lab experiement of PHY course (Cercuit Theory). Here is what I did:

Part 2: I-V characteristics of a diode:

a. Simulation of an “ideal” diode

I recorded the voltage and the current in excel file.

b. Simulation of a “real” diode

I recorded the voltages and currents values in excel file.

c. IV characteristics of a real-world diode working with the real NI ELVIS II+ platform.

I Started voltage sweep at -2.00 V and I Increment voltage by 0.05 V and I Stop voltage sweep at 2.00 V recorded the values of the current and voltages.

Now, I have to answer this question:

Q2 As you now know, diodes do not conduct when reverse biased. In reality however, their resistance is not infinite, and consequently, a small leakage current flows from the negative terminal to the positive terminal. Based on the recorded currents for -2 V to 0 V, is this leakage current present in the two simulated diodes and were you able to observe it with the real-world diode?

Explanation / Answer

The ideal diodes have infinite resistance to reverse voltage. It will not conducts any reverse current, called leakage current at all when voltage is applied in reverse, no matter how great the voltage is. It is a perfect insulator when voltage is applied in reverse. Where as A real or conventional diode will conduct some leakage current even when the reverse voltage hasn't reach the breakdown point. After the breakdown voltage is reached, it will conduct a large amount of current, called avalanche current, in reverse.

You can measure this small leakage current if you have sufficiently small leastcount ammmeter like micro or even in some case nano ammeter.

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