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Design of differential filters for high-speed signal chains

Posted: 08 Feb 2010 ?? ?Print Version ?Bookmark and Share

Keywords:high speed signal? conversion techniques? LC filter?

Differential signals have many desirable attributes in high-speed signal chains: namely, common-mode rejection from a balanced signal path and matched filter response, immunity from single-ended component parasitic effects, decoupling the signal from requiring a ground reference, and rejection of even-order harmonics. However, most LC filter design information, techniques and software are for single-ended systems. This application report highlights some simple translations that can be made to convert the single-ended designs to fully differential designs. Some examples are used to demonstrate these translations.

The design of single-ended passive analog LC filters has been simplified greatly by various pieces of software that can be obtained freely on the Internet. An Internet search for LC filter design yields many results, any of which can be used for this tutorial.

This application report uses ELSIE ( i.e. LC), which is freely available for download from the following link as a trial version with some limitations on filter order and usage.

View the PDF document for more information.

Click here to view related datasheets.

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