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Amplifier Filter Design Utilities

Anti-Aliasing Filter Tool for Data Converters

FilterThis is a Microsoft Excel spreadsheet that allows you to enter the converter resolution, sample rate, and order of filter. You can then view a graph which shows the response of the filter at an assumed 20dB/decade rolloff per pole, and the aliased spectrum around the sample rate. Where the two lines cross, aliasing will occur. If it is below the resolution and frequency range of interest, all is well. If not, you can experiment with the cutoff frequency and number of poles to quickly find an acceptable combination. With these parameters chosen, you can design the active filter using a tool like FilterPro™.

FilterPro™ Design Program and Application Note

FilterPr™ MFB and Sallen-Key Design Program is a Windows application that designs Multiple-Feedback and Sallen-Key low-pass and high-pass filters using opamps, resistors and capacitors. This program supports Bessell, Butterworth, and Chebychev filter types and can be used to design filters from 1 to 10 poles. The capacitor values in each stage can be either selected by the computer or entered by the designer. An “always on” prompt window provides context-sensitive help information to the user. The response of the filter is displayed on a graph, showing gain, phase and group delay over frequency.

If you wish to subscribe to an e-mail list for FilterPro then please send an email to majordomo@list.ti.com with the message “subscribe filterpro@list.ti.com” in the body of the e-mail.

R C Calculator

Use this javascript utility to calculate the R and C values for one pole filters at a given frequency.

Analog Filter Design

Designing analog filters for beginners, experienced, and expert designers.