Report

Introduction:

Welcome to the first lab in ET212. Week 1 lab is an introduction to semiconductors and diode theory and should be implemented in software (Multisim) only. Week 2 onwards labs will be implemented in hardware only using NI myDAQ development tool, software only or both.

· For instructions on setup and installation of NI myDAQ hardware and software, please review the document “ Setting up NI myDAQ ” and watch the video “ Video 1: Setup and Installation of NI myDAQ ”.

· Once you receive the hardware kit, review the contents and install the software: Multisim, NI LabVIEW and NI ELVISmx. Follow the instructions for connecting NI myDAQ hardware with the computer found in video 1. After the set-up, watch the video “ Video 2: Tour of the NI ELVISms Instrument launcher ”.

· Complete the Safety Module.

Materials and Equipment:

Materials:

· Simulated Parts (Multisim):

. 1N4001 Diode

. Two resistors (2.2 KΩ and 1.8 KΩ)

Equipment:

· Virtual Instruments (Multisim):

. Agilent Multimeter

Procedure:

** This lab has to be implemented only in software (running simulation in Multisim) **

1. Construct the circuit shown in Figure 1 below in Multisim with R1 = 2.2 KΩ and R2 = 1.8 KΩ. Use a 10% tolerance for the resistors. (Refer to the tutorial in Tools and Templates to set the tolerance) Assume an ideal diode.

Part A:

1. Calculate current ‘I’ in the circuit shown in Figure 1. Show work.

2. Calculate the voltage drops across R1 and across R2.

3. Construct the circuit in Multisim and measure the current in the circuit using the Agilent Multimeter. Compare it to your calculated value in Step 1.

4. Using the Agilent Multimeter, measure the voltage drops across R1 and across R2, and compare it to what you calculated in Step 2.

I= 12-0.7/48k = 2.825 mA

Vr1 = 2.2k*2.825 mA = 6.215 V

Vr2 = 1.8k* 2.825mA = 5.085 V

Part B:

1. Reverse the polarity of the diode and analyze the circuit. Repeat steps 1) and 2) from Part A.

2. Construct the revised circuit in Multisim and repeat steps c) and d) from Part A.

3. Tabulate all your data below using appropriate units. Be sure to capture the screen for the measured values.

Table 1:

	Calculated	Measured
Part A: Current (I)	2.825mA	2.87mA
Part A: Voltage drop across R1(VR1)	6.215V	6.313 V
Part A: Voltage drop across R2 (VR2)	5.085V	5.165V
Part B: Current (I)		669.687nA
Part B: Voltage drop across R1 (VR1)		1.474mV
Part B: Voltage drop across R2(VR2)		1.206 mV

Review Questions:

1. Does the simulation results match the calculated values? If not, explain what causes this difference in the measurements.

2. What is the difference between Part A and Part B with respect to the current and voltage drop in the circuit?

Question B

In your own words:

1. Explain what a semiconductor is.

2. Describe one aspect of the operation of a semiconductor using principles from chemistry (for example: intrinsic, extrinsic, unbiased, forward bias, or reverse bias).

3. Give one application of semiconductors in technology.