Lab 1 - ECE 421L
Authored
by Nicholas Banas,
Banasn1@unlv.nevada.edu
1/29/15
This lab is a review of basic RC circuits and an introduction to HTML editing.
Problem 1.21
The
first circuit is a simple RC circuit that has a 200Hz 1VAC input with a
1k Ohm resister in series with a 1 uF capacitor where
the output is taken off the capacitor.
![](Circuit%201.png)
The rough calculations showed an expected output of .6227 VAC with a phase shift of -51.49 deg.
![](hand1.png)
The spice sim showed an expected output of 0.62VAC with a phase shift of -51.5 deg.
![](Prob%201.PNG)
![](AC1.PNG)
The actual measurements showed an output of 1.34VAC and a phase shift of -49.1 deg.
![](Scope%201.BMP)
The
actual results required a normalization of the voltage. This is due to
the function generator expecting a circuit impedance of 50 ohms
and as such it outputs a voltage much higher than the 1V requested.
After normalization the output voltage is 1.34VAC/2.14VAC = 0.626
VAC. This is very close to our expected results. The phase
shift requires no normalization and is still relatively close to the
expected results.
Problem 1.22
This circuit is a simple RC circuit that has a 200Hz 1VAC input with a
1k Ohm resister paralleled with a 2uF capacitor both in series with a 1 uF capacitor where the output is taken off the 1uF capacitor.
![](Circuit%202.png)
The rough calculations showed an expected output of .694 VAC with a phase shift of -6.84 deg.
![](hand2.png)
The spice sim showed an expected output of 0.69VAC with a phase shift of -6.84 deg.
![](Prob%202.PNG)
![](AC2.PNG)
The actual measurements showed an output of 1.54VAC and a phase shift of -6.9 deg.
![](Scope%202.BMP)
Once
again, due to the equipment used in this lab the output voltage
requires normalization. The normalized output is 1.54VAC/2.2VAC =
0.70VAC. With the corrected measurements both the output voltage
and phase are a close match to the expected results.
Problem 1.24
This circuit is a simple RC circuit that has a 1V 1MHz square wave input with a
1k Ohm resister in series with a 1 pF capacitor where the output is taken off the 1pF capacitor.
![](Circuit%203.png)
The spice sim showed an expected peak output of 0.9555V.
![](Sim%203.png)
![](AC3.png)
We were unable to get lab measurements due to time constraints.