ELEC 101, Spring 2005
Prof. Rich Kozick
Frequency Response and Bode Plots
We will measure the frequency response of low-pass, band-pass, and
The results will be presented on Bode plots.
In Lab 8,
we will compare the measured results with analytical formulas,
and we will also use these filters to build an audio equalizer.
Please complete all of the activities for one circuit before going
on to the next circuit.
Save your circuit components and bring them to lab next week.
Collect frequency response data in your lab notebook for the frequency
range from 10 Hz to 20,000 Hz.
At minimum, collect data at the frequencies 10, 20, 50, 100, 200, 500,
1000, 2000, 5000, 10,000, and 20,000 Hz.
You may want to take more data in the "knee" of the frequency
For each frequency, measure the amplitude of the input and output
voltage sine wave.
Produce a Bode plot of your data:
20 log10 (Output amplitude / Input amplitude) versus
frequency on a logarithmic scale
Associate the following names with the appropriate circuit:
low-pass, band-pass, high-pass filter.