We describe modular voltage and current isolation schemes in a Power Management Integrated Circuit (PMIC) silicon platform. The isolation reduces the power dissipation during switching at the high side driver. It also suppresses the cross talk between power devices switching up to 60V at several Amps, and sensitive analog / digital circuitry on the same chip. Standard, buried layer and Isolated Drain isolation schemes allow a tradeoff between the isolation level and the process complexity of the platform. The different schemes allow a current suppression ratios of 10^-7 in the vicinity of the Power devices or better if guard rings are combined..
Synopsis.-A theory of the propagation of electromagnetic waves derived by Professor Pleijel from the elementary theory, are menguided by a system of parallel wires is developed with particular tioned together with several remarks of practical importance. The reference to the effect of the earth, and is simplified so that it is simplified theory leads to the same conclusions and, consequently, identical in form with the elementary theory.to the same applications. Important general properties of a system of parallel conductors The simplified theory gives promise of successful application to and their application to problems of propagation in power or such problems of propagation in transmission systems which communication circuits, or in a system of both types of circuits, heretofore as a rule have not been formulated with sufficient precision.
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