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As CMOS technologies and their respective supply voltages continue to scale downwards, new methods for designing RF analog and mixed-signal circuits must be found. A promising technique that has emerged is the use of monolithic transformers. Unfortunately, due to parasitic magnetic coupling, there can be a substantial amount of cross-talk between transformers and other, nonrelated, devices resulting...
Parasitic magnetic coupling is a major design challenge for integrated circuit designers. Fundamentally, it originates in conventional spiral inductors because the magnetic field is not localized, extending far beyond the perimeter. This paper introduces a twisted winding scheme for inductors that increases the localization of the magnetic field, reducing parasitic magnetic coupling by as much as...
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