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

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

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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. 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. en_US
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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