Lab 5 - ECE 420L 

Authored by Desi Battle,

March 7th, 2017

  

../6JZ8ETCQ/ex0%5B1%5D.jpg
lab5_exp0.JPG
lab5_exp1.JPG
Oscilloscope photo verifying 90 degree phase shift and unity gain at 159 Hz.
I did expect the results to match my hand calculations.


Design, simulate, and build a square-wave to triangle wave generation circuit.
Assume the input/output frequency is 10 kHz and the output ramp must swing from 1 to 4 V centered around 2.5 V.




lab5_exp2_step1.JPG
Sketch of triangle wave we are attempting to create

lab5_exp2_schem.jpg
Schematic for specified triangle wave

Choosing R and C

lab5_exp2_values.JPG
As shown in the schematic above, eventually I settled with C = 0.1n and R = 400k
I found in my experiments that minimizing C and maximizing R produced the best results.
It is unclear to me why different combinations of R and C = RC produced different results, but I believe
this is due to the components varying from the values they were designed to have.


I chose a Pulse from 0 to 5 V because it was the simplest way for me to meet the requirements of centering at 2.5 V



lab5_exp2_sim.JPG
Simulation results of Schematic


lab5_exp2_scope.JPG
Oscilloscope photo verifying hand calculations above

 

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