Lab 07: Bandpass Filter

In order to create a more efficient and better operating mixer for the radio, I needed to filter out unwanted frequencies from the mixer. This can be accomplished using several types of filter, but for this lab I chose a bandpass filter. This filter was constructed as a 'tank circuit', made up of a resistor, inductor, and capacitor in parallel. The tank circuit bandpass filter used in this lab followed the circuit diagram included in the lab, as shown below.

After assembling the circuit as instructed, I tested the bandpass filter for two cases: with Rl and Rs at 100 Ohms and again at 1k Ohms. In order to test this circuit, I sweeped the function generator at the input of the circuit to find the resonant frequency and the sidebands -3 dB below that in order to determine the bandwidth and Q of the circuit. My results are included in the chart below.