EE 212 Lab
Lab 8: Frequency Response of Circuits
Prelab 8
The purpose of this lab is to experimentally construct the frequency responses
of two circuits. The circuits to be studied are the passive RLC circuit shown in
figure 1 and the active network shown in figure 2.
1. Frequency
response of RLC circuit.
- Construct the circuit shown in figure 1.
- Let vin(t) be a 1 Vp-p sine wave for which
you'll vary the frequency.
- Use your prelab results as a guide as to what frequency range should be
used and measure the frequency response (magnitude and phase) of Vout(jw)/Vin(jw).
Note the function generator and oscilloscope display frequency in Hertz and
your Bode plots are likely versus frequency in rad/sec, so make sure to
convert whichever way you choose to keep the units consistent. Take
extra points in regions where the magnitude or phase change quickly.
- Compare
your results with the calculated values plotted in the prelab by
recording the experimental data on top of the calculated prelab data.
- How would one describe this circuit?
- Does this passive circuit ever yield a gain larger than 1 (0dB)? If so,
how is this possible?
2. Frequency response of active circuit.
- Construct the circuit shown in figure 2.
- Let vin(t) be a 1 Vp-p sine wave for which
you'll vary the frequency.
- Use your prelab results as a guide to what frequency range should be used
and measure the frequency response (magnitude and phase) of Vout(jw)/ Vin(jw).
Note the function generator and oscilloscope display frequency in Hertz and
your Bode plot is likely versus frequency in rad/sec, so make sure to
convert whichever way you choose to keep the units consistent. Take
extra points in regions where the magnitude or phase change quickly.
- Compare
your results with the calculated values plotted in the prelab by
recording the experimental data on top of the calculated prelab data.
- How would one describe this circuit?
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