Yehia Massoud

Rice University, Houston, Texas, United States

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Publications (190)70.01 Total impact

  • Sami Smaili, Yehia Massoud
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    ABSTRACT: In this paper we derive conditions for bounding the state change in a memristor due to an applied signal. The main memristor functionality is a programmable resistor, but its resistance changes due to the signal passing through it. Therefore, it is necessary to guarantee that any signal through the memristor causes a small resistance change as tolerable by the application. The derived conditions relate the desired bound on the resistance change to a bound on the signal flux through the memristor. We show examples for the case of a sinusoidal signal and demonstrate the impact of the derived conditions on the design of memristor-based systems.
    2014 IEEE International Symposium on Circuits and Systems (ISCAS); 06/2014
  • Sami Smaili, Yehia Massoud
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    ABSTRACT: Random demodulation provides a hardware-compact architecture for realizing compressive sensing systems. A random demodulator is realized by a mixer, with a random signal as the oscillator, and a low pass filter. In order to recover the original signal from the compressive sensing measurements, accurate modeling of the hardware components is needed. Typically, the reconstruction model assumes the low pass filter to be an ideal integrator. While this assumption is valid at low frequencies, it poses tremendous challenges at frequencies higher than 50MHz. In this paper, we provide an accurate and efficient model for the random demodulator that takes into account the actual structure of the filter. Using our model at reconstruction allows random demodulation for bandwidths extending to the GHz range, while, as we demonstrate, assuming an ideal integrator at reconstruction severely limits the system bandwidth.
    2014 IEEE International Symposium on Circuits and Systems (ISCAS); 06/2014
  • S. Smaili, Y. Massoud
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    ABSTRACT: The use of memristors as nanoscale programmable resistors allows the realization of compact tunable analog components such as tunable gain amplifiers. However, since the memristor's resistance depends on the signal through it, the design of such tunable memristor-based components should account for this memristor resistance change. In this paper, we analyze the effect of the memristor resistance change on the gain of the differential pair amplifier and demonstrate its dependence on the amplifier parameters and the signal frequency.
    Circuits and Systems (MWSCAS), 2013 IEEE 56th International Midwest Symposium on; 01/2013
  • S. Smaili, Y. Massoud
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    ABSTRACT: In this paper we propose a reconfigurable receiver that utilizes random demodulation, a compressive sensing architecture for efficient signal projection on a sensing signal. In the proposed system, the sensing signal is designed to annihilate the contribution of undesired frequency components in the collected measurements, thus allowing for the recovery of selected signal bands. The acquisition rate is proportional to the desired signal bandwidth rather than the total bandwidth of the input signal.
    Wireless and Microwave Technology Conference (WAMICON), 2013 IEEE 14th Annual; 01/2013
  • S. Smaili, Y. Massoud
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    ABSTRACT: Memristors-based memories utilize the memristor's resistance programmability and small structure to realize high density non-volatile memories. This programmability arises from the dependence of the memristor's resistance on the magnetic flux and total charge, rather than the voltage and current passing through it. However, a critical requirement in memory applications is that the reading scheme should preserve the memristor state after the read. In this paper, we propose a robust reading scheme for memristor-based memories that uses a differential pair sensing amplifier.
    Circuits and Systems (ISCAS), 2013 IEEE International Symposium on; 01/2013
  • S. Smaili, V. Singal, Y. Massoud
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    ABSTRACT: The random demodulator architecture is a compressive sensing based receiver that allows the reconstruction of frequency-sparse signals from measurements acquired at a rate below the signal's Nyquist rate. This in turn results in tremendous power savings in receivers because of the direct correlation between the power consumption of analog-to-digital converters (ADCs) in communication receivers and the sampling rate at which these ADCs operate. In this thesis, we propose design techniques for a robust and efficient random demodulator. The resetting mechanism can pose challenges in practical settings that can degrade the performance of the random demodulator. We propose practical approaches to mitigate the effect of resetting and propose resetting schemes that provide robust performance.
    Circuits and Systems (MWSCAS), 2013 IEEE 56th International Midwest Symposium on; 01/2013
  • Source
    Hamid Nejati, Ahmad Beirami, Yehia Massoud
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    ABSTRACT: Tent map is a discrete-time piecewise-affine I/O characteristic curve, which is used for chaos-based applications, such as true random number generation. However, tent map suffers from the inability to maintain the output state confined to the input range under noise and process variations. In this paper, we propose a modified tent map, which is interchangeable with the tent map for practical applications. In the proposed modified tent map, the confinement problem is solved while maintaining the functionality of the tent map. We also demonstrate simulation results for the circuit implementation of the presented modified tent map for true random number generation.
    Midwest Symposium on Circuits and Systems 05/2012;
  • Vikas Singal, Sami Smaili, Yehia Massoud
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    ABSTRACT: Closing the THz gap would lead to a tremendous of advancement in a wide range of applications such as biomedical imaging, security, and material inspection. The gap refers to the lack of devices for the manipulation of THz radiation as compared to its microwave and optical counterparts. Plasmonic devices based on semiconductors rather than metals allow the realization of efficient and small scale THz devices by utilizing the unique properties of plasmon oscillations. In this paper, we investigate the performance of an InSb-SiO2-InSb structure for THz waveguiding. We study the propagation length and the skin depth of the symmetric and antisymmetric transverse magnetic modes of these waveguides. We use numerical techniques to solve for the dispersion relation and derive the propagation length and the skin depth as a function of frequency.
    01/2012;
  • Y. Massoud, Fan Xiong, S. Smaili
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    ABSTRACT: Memristors promise to allow high levels of compaction in computing systems because these elements combine memory and switching functionality. This can be utilized to overcome some of the hardware challenges in compressive sensing architectures. In this paper, we propose a compressive sensing system architecture that uses a memristor-based random modulator. The gains of using such a memristor-based modulator mainly stem from replacing memory blocks and many of the switching components typically used in compressive sensing. We discuss some of these benefits and the design considerations that need to be addressed in memristor-based compressive sensing architectures.
    Circuits and Systems (ISCAS), 2012 IEEE International Symposium on; 01/2012
  • S. Smaili, Y. Massoud
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    ABSTRACT: The tremendous advancement in communications technology and its use in a wide range of applications have increased the importance of high bandwidth reconfigurable receivers that can monitor a large bandwidth and be reconfigured to receive signals within a specific sub-band. Because of the stringent power and size requirements in most applications for communications systems, it is important to achieve such high surveillance bandwidth and reconfigurability with the minimum possible power consumption and hardware components. In this paper we propose a high bandwidth radio receiver based on the newly emerging theory of compressive sensing. The proposed receiver can reconstruct signals in a specific sub-band within a wide surveillance band using an analog-to-digital converter running at a rate comparable to the sub-band bandwidth, and much less than the surveillance bandwidth. The desired band to be reconstructed can be changed in software thus eliminating the use of many bandpass filters.
    Wireless and Microwave Technology Conference (WAMICON), 2012 IEEE 13th Annual; 01/2012
  • S. Smaili, Y. Massoud
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    ABSTRACT: Compressive sensing is a newly emerging theory that provides the means to recover a signal from samples obtained at a sub-Nyquist rate. This in turn leads to tremendous reduction in power consumption of receivers because of the direct correlations between the sampling rate and power consumption of analog-to-digital converters, which constitutes a considerable amount of the receiver's power consumption. In this paper, we propose an architecture for the random demodulator, which is a compressive sensing based receiver, that requires a sub-Nyquist digital clock rather than a Nyquist rate clock. In a conventional random demodulator, the input signal is mixed with a pseudo random sequence, running at the signal's Nyquist rate and then integrated and sampled. In order to overcome this constraint, we propose the use of frequency division multiplexing, in the analog domain, of many digitally generated random sequences running at a sub-Nyquist rate to generate an effective random sequence. The major gain in this approach is that the restricting requirement of having a fast clock is levitated, thus allowing to extend the capabilities of the random demodulator beyond the restrictions imposed by the digital technology.
    Wireless and Microwave Technology Conference (WAMICON), 2012 IEEE 13th Annual; 01/2012
  • Vikas Singal, Sami Smaili, Yehia Massoud
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    ABSTRACT: In recent years, the usage of the Terahertz (THz) portion of the electromagnetic spectrum has been investigated in the field of communications, medicine and biology. The evaluation of the THz wave performance in the applications requires supportive THz based devices such as emitter, detectors and filters. The efficient integration of the THz devices with the state of the art silicon based devices is limited by its typical diffraction limit (millimeters). In this abstract, a subwavelength Surface Plasmon Polaritons (SPPs) based Bragg reflector is using Indium antimonide (InSb), Silicon-dioxide (SiO2) and Porous-SiO2, is proposed. The SPPs based wave propagation at THz allows the nanoscale realization of the THz based devices. The proposed plasmonic Bragg reflector utilizes the periodic changes of the dielectric material in the core layer, while InSb is used in the cladding layer. Finite Element Method (FEM) based simulations are used to demonstrate the working of the proposed subwavelength Bragg reflector.
    01/2012;
  • Sami Smaili, Vikas Singal, Yehia Massoud
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    ABSTRACT: Graphene demonstrates superior electronic properties that make it a potential candidate for future electronic systems. Graphene, additionally, support surface plasmon oscillations, which in turn makes graphene attractive for optoelectronics because of its planar structure and its conductivity properties. When a graphene layer is confined in one dimension, a graphene nanoribbon arises, with proerties differing from the original two dimensional graphene. In this paper we study the main properties of plasmon oscillations on metallic armchair graphene nanoribbons using the dielectric function obtained through the random phase approximation. We mainly study the effect of the graphene nanoribbon width on the plasmon propagation length using numerical techniques to extract the dispersion relation of graphene nanoribbons and the propagation properties of palsmons on graphene nanoribbons.
    01/2012;
  • K. Wilhelm, Y. Massoud
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    ABSTRACT: Upper extremity prosthetic limbs have succeeded in providing people affected by disabilities such as amputation or paralysis the ability to perform simple manual tasks. Typically, prosthetic limbs are controlled by electromyography (EMG) signals read from the muscles of the patient. As the capabilities of prosthetic hands improve toward those of the intact human hand, their mechanical complexity increases, making the development of advanced techniques for reading and interpreting these EMG signals, while pushing down the power consumption of the sensing device is becoming more critical. In this work, we investigate the classification EMG signals acquired using the technique of compressive sensing, which provides solutions for reducing sensor power and complexity by relaxing the constraints posed by the Shannon sampling theorem on the rate at which the analog signals, in general, should be sampled for preserving the signal's information. We show that using compressive sensing, we can reduce the sampling rate by at least 10 times while maintaining classification accuracy higher than 95%.
    Circuits and Systems (ISCAS), 2012 IEEE International Symposium on; 01/2012
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    ABSTRACT: Recent research has demonstrated the use of plasmonic nanoparticles (e.g., a silver or a gold nanosphere) as circuit elements. In these metallic nanoparticles, an electromagnetic wave at optical frequencies excites conduction electrons resulting in a plasmon resonance. The derived values of circuit components are based on the observation that the small size of the particle compared to the wavelength leads to lumped-impedance representations under the quasi-static approximation. In this paper, we show that circuit representations based on quasi-static approximations can often result in large errors for typical nanosphere sizes. To remedy this issue, we present a new approach based on time-varying fields, which uses vector wave functions to explicitly derive accurate resonance frequency and impedance expressions for these metallic nanospheres at and around the plasmon resonance. In particular, the proposed approach accurately predicts the dependence of the resonance frequency on the size of the nanoparticle and yields more accurate expressions for the equivalent L and C lumped elements compared to the quasi-static model. The new impedance approach is still compatible with the process of cascading nanoparticles in series and parallel combinations to synthesize more complex nanocircuits. A comparison with Mie and full-wave finite-element simulation results demonstrates that our model provides accurate closed-form expressions, thereby extending the range of the impedance representation to larger radii nanoparticles.
    IEEE Transactions on Microwave Theory and Techniques 11/2011; · 2.94 Impact Factor
  • Sami Smaili, Yehia Massoud
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    ABSTRACT: We use a system-based model for nanoparticles that can capture the scattering by two spherical nanoparticles. The model considers the nanoparticle a system whose input is the sum of all incident electric fields around the nanoparticle and the output is the scattered field by the nanoparticles. The model uses the quasistatic approximation together with translation relations for spherical harmonics in order to efficiently capture the properties of plasmonic dimers.
    01/2011;
  • Sami Smaili, Vikas Singal, Yehia Massoud
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    ABSTRACT: In this paper we study the effect of the core displacement orientation in nanoegg dimers on the resonance properties of the dimer. We consider the case of symmetrical nanoegg dimers and uniform nanoegg dimers, where in Symmetrical nanoegg dimers, the core in one nanoegg is displaced in a direction opposite to the direction of core displacement in the other, while in uniform nanoegg dimers, the core displacement is the same in the two nanoeggs. We show how the orientation of the core displacement affects the field enhancement and the resonance wavelength of the dimer.
    01/2011;
  • Sami Smaili, Yehia Massoud
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    ABSTRACT: In this paper we derive the retarded dispersion relation for plasmons at the interface between a semi-infinite metal and a semi-infinite dielectric starting from the charge density and the current density. We use the retarded electric and magnetic potentials to arrive at the surface plasmon dispersion relation. Additionally, we derive the electric and magnetic fields using the potentials and show that the derived field components obey the same relations with respect to each other as the plasmon fields. The approach we present in this paper is helpful for deriving transmission line models for plasmonic interconnect structures, which are proposed as replacements for the traditional copper interconnects in future VLSI systems. This in turn is important to study the properties of such structures as interconnects.
    01/2011;
  • Sami Smaili, Yehia Massoud
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    ABSTRACT: The properties of plasmonic nanoparticles in the vicinity of other plasmonic nanoparticles differ from those of individual nanoparticles due to the interaction between the nanoparticles. In this paper, we study the field enhancement by dimers, a result of the plasmon oscillation resonance. Additionally, the resonance properties of dimers depend on the separation between the nanoparticles constituting the dimer. In our study, we use the quasistatic approximation together with translation relations for spherical harmonics in order to efficiently capture the properties of plasmonic dimers.
    01/2011;
  • Yehia Massoud, Sami Smaili, Vikas Singal
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    ABSTRACT: Reducing power consumption of radio receivers is becoming more critical with the advancement of biomedical portable and implantable devices due to the stringent power requirements in such applications. Compressive sensing promises to tremendously reduce the power of radio receivers by allowing the reconstruction of sparse signals from measurements acquired at a sub-Nyquist rate. In this paper, we present efficient implementations of random demodulator-based analog to information converters. We propose the use of frequency division multiplexing to generate random sequences that allow the use of clocks with sub-Nyquist rates and a two integrator design to provide an efficient and practical realization of the random demodulator.
    01/2011;

Publication Stats

3k Citations
70.01 Total Impact Points

Institutions

  • 2005–2012
    • Rice University
      • Department of Electrical and Computer Engineering
      Houston, Texas, United States
  • 2009
    • Pennsylvania State University
      • Department of Computer Science and Engineering
      University Park, MD, United States
  • 2006
    • University of Houston
      • Department of Electrical & Computer Engineering
      Houston, TX, United States
  • 2002–2003
    • Synopsys
      Mountain View, California, United States
  • 1996–2002
    • Massachusetts Institute of Technology
      • • Research Laboratory of Electronics
      • • Department of Electrical Engineering and Computer Science
      Cambridge, Massachusetts, United States