Below is a sample text output page for band-pass filters. At the top of the presentation is a list showing the input specifications. Listed first is the center frequency, then the pass bandwidth. Next would be the stop andwidth and the required attenuation unless a manual entry for the order was done as in this case. The input output termination resistances, the filter order and the geometric configuration finish the list. Double check that all specifications are correct. The software used the data displayed in the first half of the output. Below that is a sample output chart showing inductances in Henries and capacitances in Farads. Since band-pass filters use series resonant and parallel resonant branches, |
each line represents the data for one of those branches. Be alert to whether the data pertains to a series resonant or to a parallel resonant branch.
In the case of a band-pass Tee - Shunt filter, the pair at X_{1A} and X_{1B} represent a series resonant circuit. If the choice were band-pass Pi - Shunt, then that same pair would be a parallel resonant circuit. See Help - Geometry in the main menu for sample diagrams. Read the 'Geometry' section in the helps to see the exact location of each component. Finally, please read the Caveat section in the main menu to get an idea of the inaccuracies in the computer's estimation for the order necessary to achieve the filter requirements for the band pass filter. |
Band-Pass Filter Specifications | |||
Center Frequency | 1000000 Hz | ||
Pass Bandwidth | 500000 Hz | ||
In/Out Resistance | 50 Ohms | ||
Filter Order | 3 | ||
Filter Geometry | Tee - Series | ||
Filter Elements | |||
XnA | Inductor Henries | XnB | Capacitor Farads |
X1A | 1.59155E-05 | X1B | 1.69766E-09 |
X2A | 2.12207E-06 | X2B | 1.27324E-08 |
X3A | 1.59155E-05 | X3B | 1.69766E-09 |