Tobi Delbruck
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Bump Circuits

"Bump" circuits compute similarity and dissimilarity measures between analog voltages. I invented the bump circuit in Mead's lab around 1990 while working on vision chips that measure image blur in order to autofocus. The following paper describes everything I knew at that time:

For more recent information and data about common-mode behavior see the following short paper. This information could be important if you use the antibump circuit as a means for measuring dissimilarity.

These circuits are covered by patents assigned to Caltech.

Synopsis

The simplest bump variety is the bump-antibump circuit

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It produces three output currents as a function of the differential input voltage:

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Tobi Delbruck

September 13, 2007
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