1. The half power points are the places in frequency where the power has dropped

Question

1. The half power points are the places in frequency where the power has dropped by relative to the peak (or the amplitude, which you have plotted, is 70%, i e., P V2/R- (0.70 /R 0.5/R. From each of your two graphs of frequency response, find these half-power frequencies (from the fit-line, not the data) and record below. The bandwidth is the difference in radian frequencies; compute that in Table 7-4. The half-power point on the left (ow) side of the peakisfMI. The one on the right Chigh) side of the peak is fuH.

Explanation / Answer

You have plotted the Voltage vs Frequency plot. As can be seen from the plot, the voltage increases in the beginning and then decreases after reaching a peak voltage. Let this peak voltage be V. Draw a line parallel to the frequency axis at 0.7V. This line should cut the plot at 2 points. From this 2 points drop lines perpendicular to the frequency axis. These two points are your half-power frequencies. The bandwidth is the difference between these two half-power frequencies.

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