Lab 1

Lab 1 - ECE 420L Engineering Electronics II Lab

Authored by Frank Sanchez,

sanchezf@unlv.nevada.edu

1/25/2017

For this first lab simulate, and verify the simulation results with experimental measurements, the circuits seen in Figs. 1.21, 1.22, and 1.24 (use a 1 uF cap in place of the 1 pF cap) of the book. Your results should be similar to, but more complete than, the simulation results seen on pages 17 - 23. In your report, and for each circuit, show the

Circuit schematic showing values and simulation parameters (snip the image from LTspice).
Hand calculations to detail the circuit's operation.
Simulation results using LTspice verifying hand calculations.
Scope waverforms verifying simulation results and hand calculations.
Comments on any differences or further potential testing that may be useful (don't just give the results, discuss them).

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Experiment 1

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Hand Calculated results.

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Using LTspice, I was able to simulate the circuit below; and prove my hand results.

file:///C:/Users/frank/Desktop/School/EE/EE%20420/Lab%201/figure1.21.PNG

file:///C:/Users/frank/Desktop/School/EE/EE%20420/Lab%201/figure1.21_sim.PNG

Simulated Time Delay using LTspice was around 704us. The sim also gave out -51 degrees, along with 622mV.

file:///C:/Users/frank/Desktop/lab1/figure1.21_sim_timedelay.PNG

Lab Results for time delay gave me: 726us. Very close to my hand and LTspice results.

file:///C:/Users/frank/Desktop/lab1/figure1.21_labsim.PNG

There was a very small difference between all calculations, that didn't prove anything to be wrong but only correct.

	Hand	LTspice	LAB RESULTS
Vout	0.6227V	0.6229V	0.6
Phase	-51.49	-51.48	-51.4
Time Delay	715.13us	704us	726us

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Experiment 2

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Figure 1.22

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Hand Calculated Results

file:///C:/Users/frank/Desktop/lab1/figure1.22_hand.jpg

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LTspice Results

As you can see, my Vout is 693mV, with a time delay of -82us. When I did AC analysis using 200Hz frequency, i got -6.8 degrees.

file:///C:/Users/frank/Desktop/lab1/figure1.22_timedelay.PNG

file:///C:/Users/frank/Desktop/lab1/figure1.22_ACanalysis.PNG

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Lab Results

file:///C:/Users/frank/Desktop/lab1/fig1.22_labsim.jpg

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Experiment 3

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Hand Calculations

Delay time : T_d= 0.7RC=0.7*1k*1uF=700 us

Rise time : T_r=2.2RC=2.2*1k*1uF=2.2ms

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LTspice

file:///C:/Users/frank/Desktop/lab1/figure1.24_circuit.png

Simulations give out a time delay of 700us with a rise time of 2.3ms.
file:///C:/Users/frank/Desktop/lab1/figure1.24_timedelay.PNG

You can see the different angles for Vout by varying the frequency.

file:///C:/Users/frank/Desktop/lab1/figure1.24_decade.PNG

Frequency	Magnitude	Phase Angle (degrees)
1Hz	-171udB	-359.99m
200Hz	-4.11dB	-51.48
498Hz	-10.33 dB	-72.22

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Lab Simulations

Conclusion:

This lab gave me the opportunity o review basic RC circuits using differenct methods, via by hand, LTspice, and Lab. This in hand gave me a clear understanding of how to approach any problem via different techniques.

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