2014年6月11日星期三

Frequency response and passive filters


Objective: find the resonant frequency,then calculate the quality factor and bandwidth

Procedure: 

Build the following circuit and record the value of the voltage in the capacitor at increasing frequencies
R= 1K
C= 1micro Farad

This will work as a passive filter. More specifically low pass filter 


And also record the voltage in a high pass filter

This is our data and the graphs of a low pass filter and high pass filter 


We observe how the function is decreasing. The voltage in the circuit is not equal to the V in because of that factor of 1/sqrt(2) that we get from our Vrms.
Vo/Vin is the gain in our circuit how on the lowpass the gain decreases when the frequency goes up and in the highpass filter the gain goes up as we increase the frequency. 

Conclusion:
      we learned how frequency-dependent circuits may be modified to obtain measurements of bandwidth.

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