ENGR337 Lab 2020 Spring
Lab 2 More Spice and the Compensated Probe
Name: James Ferguson
Email: jwferguson@fortlewis.edu
Lab 2: More Spice and the Compensated Probe

Task 1
1.1
Circut

Graph

The circut never reaches full voltage because the low pass dose not have enough bandwidth
1.2
a.
Circut

Graph

The circut never reaches full voltage because the low pass dose not have enough bandwidth
b.
Circut

Graph

Much better, slowing down the input frequency alows for the limited bandwidh to properly accomadate the input signal
c.
Circut

Graph


d.
Circut

Graph


1.3
Osciliscope


Task 2
Circut

Graph

Osciliscope

Vo/Vi = (1/(j*pi*20k*680p))/(100k + 1/(j*pi*20k*680p))
= 0.227893 ∠ -76.827°
-76.827° / 360° * 1/10k = 21.3*10^-6

calculated
 simulated
 measured
Vo/Vi
 0.227893 0.2578
 0.24
TimeDelay
 -21.3 μs
 -22.3 μs
 -20.6 μs

Task 3
3.1
Math
0.1 = 1Meg / (1meg + 100k + R1)
R1 = 8.9Meg Ω

Circut

Graph


3.2
Math
0.1 = (1 / (j * ω * 100p)) / (1 / (j * ω * C1) + 1 / (j * ω * 100p))
C1 = 11.11pF

Circut

Graph


3.3
The signal will be the same value at the input of the probe as the output of the probe.