The Experts below are selected from a list of 2355 Experts worldwide ranked by ideXlab platform

Z. Ignjatovic - One of the best experts on this subject based on the ideXlab platform.

  • Band-stop noise modulated bandpass sigma-delta analog-to-digital converter
    2006 IEEE International Symposium on Circuits and Systems, 2006
    Co-Authors: E.c. Moule, Z. Ignjatovic
    Abstract:

    In this paper, we present a method to reduce the effects of substrate noise on bandpass sigma-delta (SigmaDelta) ADCs through the use of band-stop noise modulation, where the notch of the modulation noise spectrum is centered around the input signal band. Several band-stop noise (BSN) resonator structures required for bandpass SigmaDelta ADC implementations are presented. The proposed designs have been adapted from traditional resonator designs. These include the Forward Euler (FE) resonator, Forward Euler non-delayed (FEND) resonator, lossless discrete integrator (LDI), and the double-delay resonator. An example utilizing a fourth-order BSN modulated bandpass SigmaDelta ADC with a 1-bit quantizer is presented. Additionally, a method to generate the required BSN sequence is proposed. Simulation results demonstrate that this architecture achieves a 7.7 dB improvement in SNR and a 19 dB improvement in SFDR over the traditional fourth-order bandpass SigmaDelta ADC

  • ISCAS - Band-stop noise modulated bandpass sigma-delta analog-to-digital converter
    2006 IEEE International Symposium on Circuits and Systems, 2006
    Co-Authors: E.c. Moule, Z. Ignjatovic
    Abstract:

    In this paper, we present a method to reduce the effects of substrate noise on bandpass sigma-delta (/spl Sigma//spl Delta/) ADCs through the use of band-stop noise modulation, where the notch of the modulation noise spectrum is centered around the input signal band. Several band-stop noise (BSN) resonator structures required for bandpass /spl Sigma//spl Delta/ ADC implementations are presented. The proposed designs have been adapted from traditional resonator designs. These include the Forward Euler (FE) resonator, Forward Euler non-delayed (FEND) resonator, lossless discrete integrator (LDI), and the double-delay resonator. An example utilizing a fourth-order BSN modulated bandpass /spl Sigma//spl Delta/ ADC with a 1-bit quantizer is presented. Additionally, a method to generate the required BSN sequence is proposed. Simulation results demonstrate that this architecture achieves a 7.7 dB improvement in SNR and a 19 dB improvement in SFDR over the traditional fourth-order bandpass /spl Sigma//spl Delta/ ADC.

E.c. Moule - One of the best experts on this subject based on the ideXlab platform.

  • Band-stop noise modulated bandpass sigma-delta analog-to-digital converter
    2006 IEEE International Symposium on Circuits and Systems, 2006
    Co-Authors: E.c. Moule, Z. Ignjatovic
    Abstract:

    In this paper, we present a method to reduce the effects of substrate noise on bandpass sigma-delta (SigmaDelta) ADCs through the use of band-stop noise modulation, where the notch of the modulation noise spectrum is centered around the input signal band. Several band-stop noise (BSN) resonator structures required for bandpass SigmaDelta ADC implementations are presented. The proposed designs have been adapted from traditional resonator designs. These include the Forward Euler (FE) resonator, Forward Euler non-delayed (FEND) resonator, lossless discrete integrator (LDI), and the double-delay resonator. An example utilizing a fourth-order BSN modulated bandpass SigmaDelta ADC with a 1-bit quantizer is presented. Additionally, a method to generate the required BSN sequence is proposed. Simulation results demonstrate that this architecture achieves a 7.7 dB improvement in SNR and a 19 dB improvement in SFDR over the traditional fourth-order bandpass SigmaDelta ADC

  • ISCAS - Band-stop noise modulated bandpass sigma-delta analog-to-digital converter
    2006 IEEE International Symposium on Circuits and Systems, 2006
    Co-Authors: E.c. Moule, Z. Ignjatovic
    Abstract:

    In this paper, we present a method to reduce the effects of substrate noise on bandpass sigma-delta (/spl Sigma//spl Delta/) ADCs through the use of band-stop noise modulation, where the notch of the modulation noise spectrum is centered around the input signal band. Several band-stop noise (BSN) resonator structures required for bandpass /spl Sigma//spl Delta/ ADC implementations are presented. The proposed designs have been adapted from traditional resonator designs. These include the Forward Euler (FE) resonator, Forward Euler non-delayed (FEND) resonator, lossless discrete integrator (LDI), and the double-delay resonator. An example utilizing a fourth-order BSN modulated bandpass /spl Sigma//spl Delta/ ADC with a 1-bit quantizer is presented. Additionally, a method to generate the required BSN sequence is proposed. Simulation results demonstrate that this architecture achieves a 7.7 dB improvement in SNR and a 19 dB improvement in SFDR over the traditional fourth-order bandpass /spl Sigma//spl Delta/ ADC.

Ramon Codina - One of the best experts on this subject based on the ideXlab platform.

Vinicio R Rios - One of the best experts on this subject based on the ideXlab platform.

  • Forward Euler solutions and weakly invariant time delayed systems
    Abstract and Applied Analysis, 2012
    Co-Authors: Norma Ortizrobinson, Vinicio R Rios
    Abstract:

    This paper presents a necessary and sufficient condition for the weak invariance property of a time-delayed system parametrized by a differential inclusion. The aforementioned condition generalizes the well-known Hamilton-Jacobi inequality that characterizes weakly invariant systems in the nondelay setting. The Forward Euler approximation scheme used in the theory of discontinuous differential equations is extended to the time-delayed context by incorporating the delay and tail functions featuring the dynamics. Accordingly, an existence theorem of weakly invariant trajectories is established under the extended Forward Euler approach.

Sergio Gomez - One of the best experts on this subject based on the ideXlab platform.

  • optimal stabilization and time step constraints for the Forward Euler local discontinuous galerkin method applied to fractional diffusion equations
    Journal of Computational Physics, 2019
    Co-Authors: Paul Castillo, Sergio Gomez
    Abstract:

    Abstract A time dependent model problem with the Riesz or the Riemann-Liouville fractional differential operator of order 1 α 2 is considered. By penalyzing the primary variable of the minimal dissipation Local Discontinuous Galerkin (mdLDG) method with a term of order h 1 − α and using a von Neumann analysis, stability conditions proportional to h α are derived for the Forward Euler method and both fractional operators in one dimensional domains. The CFL condition is numerically studied with respect to the approximation degree and the stabilization parameter. Our analysis and computations carried out using explicit high order strong stability preserving Runge-Kutta schemes reveal that the proposed penalization term is suitable for high order approximations and explicit time advancing schemes when α is close to one. A series of numerical experiments in 1D and 2D problems are presented to validate our theoretical results and those not covered by the theory.