Bandwidth frequency formula

3dB is equivalent to 0.707 times the peak Voltage/Current value , also known as the half power point.

This is known as the bandwidth (BW). In this example the bandwidth would be 10 Hz (70 Hz – 60 Hz). You can predict the bandwidth in this case using the simple formula: BW = 2f m where f m is the frequency of the simple sine wave used to modulate with .

We can write the cutoff frequency equation for RC filter circuit as: f c = 1 / (2 * π * R * C ) .

The basic difference between the two is that frequency is defined as the rate of radio signal to send and receive communication signals, whereas bandwidth is defined as the difference between the highest and the lowest frequencies of a signal generated .

Bandwidth is measured between the 0.707 current amplitude points. The 0.707 current points correspond to the half power points since P = I 2R , (0.707)2 = (0.5). Bandwidth, Δf is measured between the 70.7% amplitude points of series resonant circuit.

Rise time and 3 dB bandwidth are inversely proportional , with a proportionality constant of ~0.35 when the system’s response resembles that of an RC low-pass filter.