Butterworth Low-Pass Filter                  Calculate component and normalized 'g-values' for Butterworth                  low-pass filters between equal termination's given N, Z0, and                  Freq (10 element max.).                  Enter N,Z0, and F(MHz) [<Enter>=Quit] ? _

The sketch below identifies the Butterworth filter elements.


Let's design a 3 element 50 ohm low-pass filter with a 3 dB cut-off frequency of 10 MHz. In response to the question above, input "3,50,10" and press <Enter>

Here are the calculated component values and the normalized 1-ohm / 1 radian 'g-values.'

                                                        [g( 0 ) = 1.00000]
                C( 1 ) = 3.1831E-10 F    [g( 1 ) = 1.00000]
                L( 2 ) = 1.5915E-06 H    [g( 2 ) = 2.00000]
                C( 3 ) = 3.1831E-10 F    [g( 3 ) = 1.00000]
                                                        [g( 4 ) = 1.00000]