Linear Phase Analog Filters - home page

Here is a service for the design of linear phase analog filters - both approximation and realization. These find application as anti-alias filters in analog-to-digital converters, where over sampling is not possible, and where existing off-the-shelf IC filters are inadequate. Other optimizations are also offered, including those of linear phase bandpass filters, pulse shaping, SSB wideband linear phase quadrature phase splitters (QPS) , and Nyquist-I response filters, to name a few.

• introduction to the site
• about the specialised filter design methods offered (with an example)
• how to obtain a linear phase anti-alias filter to meet your specification
• other optimizations and examples of the joint optimization technique
• glossary of filter terms
• personal details about the author Tim Hooper
• click here to contact the author

site synopsis

This site offers access to the power of a computer-aided joint optimization technique which generates analog filter approximations far superior to any of the classical filters (with or without add-on allpass equalizers).

The optimization process controls two responses simultaneously ('jointly') - typically those of amplitude and phase - rather than independently, as in the filter-plus-equalizer combination.

Filters optimized in this manner, to meet your specification, will generally be of lower order, have lower pole Qs and vastly superior phase responses, when compared with those commonly found in many applications.

Please follow the links above, typically in the order given, to find how you can acquire one of these filters to meet your requirements.

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