Lab 1 - EE 420L
Author: Matthew Meza
Email: mezam11@unlv.nevada.edu
January 24, 2015
Review of basic RC circuits
Click on any picture for its full size!
Pre-lab work
- Request CMOSedu account
- Review and read material on editing wepages
Lab Description
- Simulate and verify results with experimental measurements
Lab Requirements
- 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).
Circuit 1.21
LTSPICE
Schematic
LTSPICE Plot
Cursor difference from signal peaks
Experimental Results
Phase
Peaks
Handwork
Conclusion
| Peak | Delay |
| Experimental | 660 mV | 720 uS |
| LTspice | 693 mV | 669 uS |
| Handwork | 623 mV | 715 uS |
The deviation between experimental, LTspice, and handwork values are acceptable for this experiment.
Circuit 1.22
LTSPICE
Schematic
LTSPICE Plot
Cursor difference from signal peaks
Experimental Results
Peaks
Phase
Handwork
Conclusion
| Peak | Phase |
| Experimental (2.2uF) | 760 mV | 120 uS |
| LTspice (2uF) | 744 mV | 91.5 uS |
| Hand Calculation (2.2uF) | 710 mV | 82.2 uS |
The original circuit uses a 2uF capacitor but the capacitor used in the experimental test was 2.2uF. The 2.2uF
value was used in the hand calcuations shown above. The deviation between experimental, LTspice, and handwork
values are acceptable for this experiment.
Circuit 1.24
LTSPICE
Schematic
LTSPICE Plot
Cursor difference from signal peaks
Experimental Results
Handwritten work
Conclusion
The
rise time in the hand calculation is 2.2ms, while the rise time from
the LTspice simulation is 2.6ms (0.8*3.28ms). I multiplied my
experimental
rise time by 0.8 because the measurement was taken from the minimum to
the maximum instead of the standard 10-90 rule
used for measuring experimental rise times.
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