Telefonaktiebolaget Lm Ericsson (publ)

Anders Dunkars

Andrej Litwin

Johan Sj&ouml;str&ouml;m

A method is disclosed for noise distribution in high resistivity substrates containing differential or balanced integrated circuitry obtaining a noise suppression by an introduction of noise distributors. Noise from an external noise source ( ) is made isotropic in relation to branches of a differential or balanced integrated circuitry by creating a low resistivity path adjacent to the differential or balanced integrated circuitry typically formed by two integrated transistors (A, B) or group of transistors. The low resistivity path in the general case is made symmetrical in relation to the integrated transistors thereby forming a noise distributor for distributing the noise evenly. The noise distributor then is formed as a floating substrate contact ( ) of the same doping kind as a substrate or a well within which the differential or balanced circuitry is contained. Furthermore the shape of the noise distributor will be optimized by simulations of the structure of the noise distributing low resistivity path, which structure does not need to be continuous as long as the low resistivity path is maintained.

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Lund, Sweden

Anders Dunkars