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CMOS 0.35 µm implementation of an auto-tuning system for a resonant converter

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Abstract

In this paper, an auto-tuning system using a variable synchronous switched capacitor is presented. This auto-tuning system is used for controlling the resonant frequency of the tank circuit of a half-bridge voltage-mode resonant converter for high intensity focused ultrasound applications. The proposed auto-tuning system is based on a switched capacitor instead of a large inductor in the classical tuning topology. Therefore, there is no need of bulky magnetic components, which makes it naturally compatible with the usage of a magnetic resonance imaging system nearby for monitoring. The circuit was designed in a CMOS 0.35 µm technology under a voltage supply of 5 V and for the working frequency of 1 MHz. Electrical simulations as well as post-layout simulations have been done and simulation results have confirmed the required performances.

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Acknowledgments

This work is partly financed by the China Scholarship Council. 978-1-4799-8893-8/15/$31.00 ©2015 IEEE.

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Authors and Affiliations

  1. University of Paris-Sud, University of Paris-Saclay, Orsay, France

    X. Wang, M. Zhang & N. Llaser

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  1. X. Wang
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  2. M. Zhang
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  3. N. Llaser
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Correspondence to M. Zhang.

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Wang, X., Zhang, M. & Llaser, N. CMOS 0.35 µm implementation of an auto-tuning system for a resonant converter. Analog Integr Circ Sig Process 89, 35–44 (2016). https://doi.org/10.1007/s10470-016-0761-x

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  • DOI: https://doi.org/10.1007/s10470-016-0761-x

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