Analog Filter Op-amp Design
What resources does Texas Instruments offer to help designers implement an analog op-amp filter design?
Texas Instruments offers four levels of support:
- "What type of filter do I need?" - a guide for beginners. This tutorial walks a designer through the basic concepts, and guides them to
the correct type of filter for their application.
- The Filter Wizard, for less experienced designers. The Filter Wizard gives solutions that offer the best compromise of performance and low
component count for single supply, voltage feedback op amp filter design. These design solutions should satisfy 90% of filter design needs.
- The Filter Expert, for more experienced designers. The Filter Expert gives a comprehensive set of design solutions - for critical
applications that demand tighter filter performance. Filter options such as split (dual) supplies, fully differential op amp filters, and current feedback filters are
supported, as are Bessel and Chebyshev response curves. Options that are deemed impracticle - leading to unreasonable resistance values, large numbers of op amps for a
simple function, etc. are not supported.
- Phone support. The wizard formats, although powerful, are inadequate for advanced filter topics such as:
- Component ratios for exact ripple values in Chebyshev filters.
- Inverse (reverse) Chebyshev and Elliptic filter characteristics.
- Filter orders greater than 2.
- Multiple stage all pass filters.
- Filters optimized for group delay.
- High-speed analog filtering.
If an application requires knowledge of these topics, the application staff at Texas Instruments will be happy to provide assistance. While the individual designer may
only encounter advanced filter design once in a lifetime, the applications staff at Texas Instruments has decades off collective experience at unusual and critical
designs. Chances are, if it can be done at all, Texas Instruments can provide the answer!