Bode plot

A Bode plot is a graph of log(magnitude) against log(frequency). It makes multiplication of magnitudes a simple matter of adding distances on the graph, since log(a×b) = log(a)+log(b). The Bode plot describes how your output will look for a normalised input. In the above examples, circuit frequencies lower than the cutoff frequency are let through, while frequencies above the cutoff frequency are attenuated. For a single-pole filter, a tenfold increase in frequency results in a tenfold attenuation in magnitude. A two-pole filter will cause a hundredfold attenuation in magnitude for the same increase in frequency.