Lab 1 - EE420L 

Iain Drews

1/30/15

• Goals of the Lab 
• Review RC circuits
• Learn to make post lab web pages
• Pre Lab Work
• Request CMOSedu account
• Review RC circuits
• 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
• Simple RC Circuit
• LTspice:
• 
• HandCalculations:
• Vout= Vint(1/(1+RJWC)=1(1/(1+1k*J*2PI*200*1u)= .63@-50°
• Lab Results:
• 
• 
• Circuit 1.22
• RC circuit with a second capacitor to rectify the phase shift
• LTspice
• 
• Handcalculations:
• C1 1uC@200hz= -j800
• C2 2uC@100hz= -j400
• 2uC||1kOHM= 371@-69°=133-j346
• Total Impeadence=133-j346-j800=133-j1146=1154@-83°
• Vout=Vin*C1/Total Impeadence= 1*800@-90°/1154@-83°=0.69@-7°
• Lab Results:
• 
• Circuit 1.24
• RC time delay
• LTspice:
• 
• Hand Calculations
• 50% time delay = .7*R*C =.7*1k*1u=.7m
• 99% time delay = 5*R*C=5m
• Lab Results
• Thought on differences and futher tests.
• No major Differences between sim hand calculations and lab results
• could also test under varying frequency to find various impeadences in RC circuit

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