# Design of Monolithic Step-Up DC-DC Converters with On-Chip Inductors

 dc.contributor.advisor Gregori, Stefano dc.contributor.author Hasan, Ayaz dc.date 2011-08-23 dc.date.accessioned 2011-08-26T21:01:27Z dc.date.available 2011-08-26T21:01:27Z dc.date.issued 2011-08-26 dc.identifier.uri http://hdl.handle.net/10214/2893 dc.description.abstract This thesis presents the design of a step-up DC-DC converter with on-chip coupled inductors. Circuit theory of DC-DC converters in general is presented, after which a mathematical model of a step up converter is developed. A circuit implementation optimized from results of the mathematical model follows. For a completely integrated step-up converter, the inductor size is reduced by increasing the frequency of operation and using a circuit topology that employs coupled inductors. Spiral inductors are also studied to achieve maximum quality factor and inductance. A fast PWM control system is used to regulate the high-frequency converter. en_US The fabrication was done in standard TSMC 0.18-$\mu$m digital CMOS process for four circuits, including one with a conventional topology and the others with a coupled inductor topology with varying inductor geometries. Measurement results from a fabricated prototype have been presented, demonstrating the functionality of the four circuits with coupled inductors on the fabricated chip and the improvement of the coupled solution over the conventional design. It is demonstrated that the circuits with coupled inductors have a significant improvement in performance based on conversion ratio and efficiency. Finally, the design process is evaluated and recommendations are made for future work. Furthermore, a new self-oscillating and robust control system is proposed that enables simpler and more efficient regulation for high-frequency converters such as one developed for this thesis. dc.language.iso en en_US dc.rights.uri http://creativecommons.org/licenses/by-nc/2.5/ca/ * dc.subject DC-DC Converter en_US dc.subject Step-Up Converter en_US dc.subject On-Chip Inductors en_US dc.title Design of Monolithic Step-Up DC-DC Converters with On-Chip Inductors en_US dc.type Thesis en_US dc.degree.programme Engineering en_US dc.degree.name Master of Applied Science en_US dc.degree.department School of Engineering en_US
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