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Lab 8 Report
C. Sample Calculations
In the prelab, students were asked to calculate unknown resistor values given circuit
parameter values such as A0 (DC gain), capacitor values and resonance frequency. Using
the following equations, students were able to solve for the resistor values.
A
0 = −
R
2
R
3
ω0 =
√
1/ (
R
2
R
4
C
1
C
2)
(resonance frequency)
Q =
R
1 / √
R
2
R
4
* √(C1/C2)
(quality factor)
D. Discussion
In Part A, students used the oscilloscope to analyze the output of a biquad filter
circuit built on the breadboard when a 100Hz, 1 Vpp square function was used as the
input. The output waveform is a highly underdamped voltage response that appears to
oscillate for a long period of time. In part B, this procedure was repeated for quality
factors of 0.3 and 3, and since these numbers are smaller, a larger amount of damping
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View Full Document was expected. For a Q of 0.3, the voltage response is overdamped. We noticed how the
voltage doesn’t seem to oscillate at all, and reaches its final value at a faster rate. For a
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This note was uploaded on 02/16/2009 for the course ECEN 214 taught by Professor Su during the Fall '08 term at Texas A&M.
 Fall '08
 SU
 Frequency

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