A 93% efficiency reconfigurable switched-capacitor DC-DC converter using on-chip ferroelectric capacitors
Author(s)El-Damak, Dina Reda; Bandyopadhyay, Saurav; Chandrakasan, Anantha P.
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Dynamic Voltage Scaling (DVS) has become one of the standard techniques for energy efficient operation of systems by powering circuit blocks at the minimum voltage that meets the desired performance . Switched Capacitor (SC) DC-DC converters have gained significant interest as a promising candidate for an integrated energy conversion solution that eliminates the need for inductors [2,3]. However, SC converters efficiency is limited by the conduction loss, bottom plate parasitic capacitance, gate drive loss in addition to the overhead of the control circuit. Reconfigurable SC converters supporting multi-gain settings have been proposed to allow efficient operation across wide output range [2,4]. Also, High density deep trench capacitors with low bottom plate parasitic capacitance have been utilized in  achieving a peak efficiency of 90%. In this work, we exploit on-chip ferroelectric capacitors (Fe-Caps) for charge transfer owing to their high density and extremely low bottom plate parasitic capacitance . High efficiency conversion is achieved by combining the Fe-Caps with multi-gain setting converter in a reconfigurable architecture with dynamic gain selection.
DepartmentMassachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
2013 IEEE International Solid-State Circuits Conference Digest of Technical Papers
Institute of Electrical and Electronics Engineers (IEEE)
El-Damak, D., S. Bandyopadhyay, and A. P. Chandrakasan. “A 93% Efficiency Reconfigurable Switched-Capacitor DC-DC Converter Using on-Chip Ferroelectric Capacitors.” 2013 IEEE International Solid-State Circuits Conference Digest of Technical Papers (February 17-21, 2013), San Francisco, CA.
Author's final manuscript
INSPEC Accession Number: 13413790