Y. Allasasmeh

University of Guelph, Guelph, Ontario, Canada

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Publications (5)0 Total impact

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    ABSTRACT: In this paper, we present a class-H audio amplifier with an H-bridged output stage. System efficiency is improved by producing a voltage envelope that tracks the input audio signal. The tracking envelope is realized by regulating a buck converter internally using voltage and current hysteresis control schemes. The H-bridged class-B output stage is designed to maximize the output swing across the speaker load with little crossover distortion. The proposed design is capable of providing a peak output RMS power of 0.49 W to an 8 Ω speaker load. The entire system is designed and simulated in a 0.18-μm CMOS technology. In simulation, the proposed audio amplifier shows improved power efficiencies and good output linearities with THD less than 0.1% under different input signals.
    Electrical & Computer Engineering (CCECE), 2012 25th IEEE Canadian Conference on; 01/2012
  • Jingqi Liu, Younis Allasasmeh, Stefano Gregori
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    ABSTRACT: This paper considers the design of fully-integrated charge pumps whose output voltage is not capped by the main device voltage limitations such as oxide breakdown. The proposed solutions, which do not need dedicated high-voltage fabrication processes, are compared to conventional circuits with same area occupation and are evaluated through simulations.
    Proceedings of the 24th Canadian Conference on Electrical and Computer Engineering, CCECE 2011, Niagara Falls, Ontario, Canada, 8-11 May, 2011; 01/2011
  • Younis Allasasmeh, Stefano Gregori
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    ABSTRACT: In this work we propose a technique for bootstrapping CMOS switches in voltage doublers and double charge pumps. The technique prevents short-circuit losses, improves driving capability, and enables efficient operation at low supply voltages. The effectiveness of our approach is verified through simulations of design examples, which also illustrate the improvements in conversion efficiency, voltage gain, and output resistance.
    International Symposium on Circuits and Systems (ISCAS 2011), May 15-19 2011, Rio de Janeiro, Brazil; 01/2011
  • Y. Allasasmeh, S. Gregori
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    ABSTRACT: In this work we study the application of charge reusing to switched-capacitor voltage multipliers. Considering three popular circuits (i.e. the Dickson, the heap, and the Fibonacci charge pumps), we analyze the dynamic power losses due to parasitic capacitances. We show how a charge reuse technique effectively decreases the dynamic power losses. The validity of our analysis is verified through simulations of design examples, which also illustrate the impact of charge reusing on voltage gain, output resistance, and conversion efficiency.
    Circuits and Systems (MWSCAS), 2010 53rd IEEE International Midwest Symposium on; 09/2010
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    Y. Allasasmeh, S. Gregori
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    ABSTRACT: This paper presents an analysis of two types of integrated charge pumps, Dickson and Fibonacci. The two circuits are compared in slow-switching conditions and at equal area occupation. A formula is developed for optimizing the capacitor sizes and improving the performance of the Fibonacci charge pump. The performance is evaluated with focus on voltage gain and output resistance and including the effects of parasitic capacitances.
    Circuit Theory and Design, 2009. ECCTD 2009. European Conference on; 09/2009