A
Filter Problem
Problem
FreqP00Int
This is a guided problem to help you with first order filters. Click
here for the filter simulator.
There are some fundamental behaviors of filters that you need to get familiar
with. Work through these problems to check how well you understand
what you have learned about first order filters.
Problems
P1
Start the filter simulator. The default values in the filter simulator
are:
-
The time constant is 0.5
seconds.
-
The input frequency is
0.5 Hz. That means that the period of the input is 2 seconds.
-
The input amplitude is
50.
For those values of circuit and input parameters what is the output frequency?
You might want to check
what this button has to say.
P2
Compute the output amplitude.
P3
Compute the phase shift from the input to the output. Enter your
output in degrees.
P4
Convert your answer from degrees to seconds, using the known value for
the period.
Now, observe the input and the output on the simulator. You should
notice the following.
-
The output peak should
be the value that you computed,
-
Important points on the
output time function should be delayed from the same important points on
the input time function by the amount that you computed. Important
points that are easy to check include the following.
-
Any zero-crossing - positive
going or negative going.
-
Any peak - positive or
negative.
Finally, you can use the simulator as you work through the filtering problems.