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Level Shifter for Triggering of High Voltage MOSFET Stack

A. Wajda, L. R. Litzko, and R. Riggs
University of Idaho
Moscow, ID, USA


High voltage stacks of MOSFETs capacitively triggered from a single input source have been created to enable on-chip switch mode power conversion by providing control of voltages somewhat higher than process ratings. Control of the switching devices requires a level shifter compatible with the incumbent Buck Converter design. This level shifter provides a PMOS stack of MOSFETs with a triggering signal referenced to the high voltage input rail characteristic of the Buck Converter circuit topology. Careful sizing of the pull-up and pull-down networks is crucial to ensure that the level shifter can switch states in a manner compatible with the Buck Converter’s desired voltage levels. In order to withstand the concurrently larger voltages, the Integrated Passive Research Team has developed a high voltage cascode level shifter topology. A cascode level shifter provides high currents necessary for consistent and reliable triggering of the PMOS switches at voltages compatible with a Buck Converter topology. The poster will present the design, layout, and building of this level shifter and document its performance in triggering high voltage MOSFET stacks.





This workshop is receiving technical co-sponsorship support from the IEEE Electron Devices Society.

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