ECEN 325 Lab 2 Report
ECEN 325-510
Lab 2 Report
Calculations:
Transfer function:
Selecting the value of components:
Bode plots
Output waves:
Simulations:
Bode plots:
Low pass:
-3.0dB frequency at 2.6kHz
Magnitude at 6k Hz is -8.6dB, phase shift is -92.15 degrees
Magnitude of input is 0.493V, output is 0.182V
Time delay is 41.5us, Phase shift is 41.5us/(1/6000)*360 = 89.64 degrees
High pass
-3.0dB frequency at 12.37k Hz
Magnitude at 6k Hz is -8.6dB, phase shift is 87.68 degrees
Magnitude of input is 0.499V, output is 0.206V
Time delay is 36.6us, Phase shift is 36.6us/(1/6000)*360 = -79.06 degrees
Band pass filter
-3.0dB frequency at 2.45k Hz and 13.12k Hz
Magnitude at 6k Hz is -5.14dB, phase shift is -2.32 degrees
Magnitude of input is 0.508V, output is 0.281V
Time delay is 5.55us, Phase shift is 5.55us/(1/6000)*360 = -11.99 degrees
Measurements:
Low pass:
-3dB frequency is 2.62k Hz
Magnitude at 6k Hz is -8.49dB, phase shift is -90.31 degrees
Magnitude of input is 0.499V, output is 0.186V
Time delay is 39.82us, Phase shift is 39.82us/(1/6000)*360 = 86.01 degrees
High pass:
-3dB frequency is 13.3k Hz
Magnitude at 6k Hz is -8.25dB, phase shift is 88.99 degrees
Magnitude of input is 0.499V, output is 0.193V
Time delay is -42.98us, Phase shift is -42.98us /(1/6000)*360 = -92.84 degrees
Band pass:
-3dB frequency is 2.01k Hz and 17.49k Hz
Magnitude at 6k Hz is -4.99dB, phase shift is 2.24 degrees
Magnitude of input is 0.500V, output is 0.281V
Time delay is -1.26us, Phase shift is -1.26us /(1/6000)*360 = -2.72 degrees
Table of data:
Type of Filter |
Calculation |
Simulation |
Measurement |
Low pass |
0.22sin(2*pi*6000t-86.77) |
0.18sin(2*pi*6000t-89.64) |
0.19sin(2*pi*6000t-90.31) |
High pass |
0.25sin(2*pi*6000t+86.92) |
0.21sin(2*pi*6000t+76.06) |
0.19sin(2*pi*6000t+92.84) |
Band pass |
0.33sin(2*pi*6000t+3.18) |
0.28sin(2*pi*6000t+11.99) |
0.28sin(2*pi*6000t+2.72) |
Comments
When compare the results form calculation, simulation, and measurements, they appear to be the same in general. However, magnitude of calculation tends to be higher than both simulation and measurement. Since the value of components I selected has difference compare to calculation, this difference can be explained.
The basic idea of choosing components is to make sure they match to the calculated value as close as possible. Since the constant is the product of inductance and resistance, when increase the capacitance of the capacitor, we have to find a resistor with a correspond smaller resistance. The trade off of changing to another set of components could result in a bigger variation of the measurement data.