Kennesaw State University Focus Bandpass Filter Project Paper

Objective: To gain experience in designing and simulating bandpass filters based on certain specifications for center frequency, bandwidth, and quality factor using both Matlab and PSpice.

Simulation Procedures:

Part A) Design Bandpass Filter in PSpice

The circuit is a series RLC circuit. Choose the R, L, and C component values to meet the design specifications.

Design specifications: Use last 6 digits of student ID number ( e.g. 000123456 –> 123456)

1) Bandwidth: first two digits in kilohertz (e.g. 12 kHz)

2) Center frequency: middle two digits in megahertz with decimal point in between (e.g. 3.4 MHz)

Part B) Simulation

1. For the simulation, draw the schematic for the bandpass filter. Input the values for the resistors, inductors, and capacitors to meet the design specs.

2. Use a sinusoidal source, which provides the AC input voltage, with amplitude = 1V.

3. For the simulation settings, set the simulation to AC sweep. The resulting graph is a frequency response as the frequency is swept from a start frequency to a stop frequency.

4. Set the start frequency and stop frequency at to any values that will show the overall bandpass filter Bode plot, and shows a good symmetric plot.

5. Plot the output voltage/input voltage as a linear plot.

Part C) Transfer function

1. Derive the transfer function of the series RLC bandpass filter, based on the R, L, and C values used for Parts A and B.

2. Use Matlab to plot the linear and Bode plots.

Report Submission

For the report, type the report in a Word document and include the following information:

1. Title page: Course name, number, and term (e.g. Fall 2014), student name and ID number, Date submitted
2. Design specifications: Use a table to show the values for the center frequency, bandwidth, and quality factor based on your student ID#. Also, include the R, L, C values
3. Math equations used to obtain the R, L, and C values from the design specs.
4. Figures: Schematic of circuit, PSpice graphs of the output voltage/input voltage as both linear plot and Bode plot; Matlab linear and Bode plots of the transfer function.
5. Matlab code
6. Table that includes the values of the gains at the cutoff frequencies (half-power frequencies), and the center frequency from PSpice.
7. Label all figures and tables.

Submission instructions: Upload the report as well as PSpice file to the Assignment Dropbox.