The Experts below are selected from a list of 39270 Experts worldwide ranked by ideXlab platform

Victor Sreeram - One of the best experts on this subject based on the ideXlab platform.

Vijay G Subramanian - One of the best experts on this subject based on the ideXlab platform.

  • capacity and reliability function for small Peak Signal constraints
    IEEE Transactions on Information Theory, 2002
    Co-Authors: Bruce Hajek, Vijay G Subramanian
    Abstract:

    The capacity and the reliability function as the Peak constraint tends to zero are considered for a discrete-time memoryless channel with Peak constrained inputs. Prelov and van der Meulen (1993) showed that under mild conditions the ratio of the capacity to the squared Peak constraint converges to one-half the maximum eigenvalue of the Fisher information matrix and if the Fisher information matrix is nonzero, the asymptotically optimal input distribution is symmetric antipodal Signaling. Under similar conditions, it is shown in the first part of the paper that the reliability function has the same asymptotic shape as the reliability function for the power-constrained infinite bandwidth white Gaussian noise channel. The second part of the paper deals with Rayleigh-fading channels. For such channels, the Fisher information matrix is zero, indicating the difficulty of transmission over such channels with small Peak constrained Signals. Asymptotics for the Rayleigh channel are derived and applied to obtain the asymptotics of the capacity of the Marzetta and Hochwald (1999) fading channel model for small Peak constraints, and to obtain a result of the type of Medard and Gallager for wide-band fading channels.

Andreas Kaiser - One of the best experts on this subject based on the ideXlab platform.

  • very low voltage digital audio spl delta spl sigma modulator with 88 db dynamic range using local switch bootstrapping
    IEEE Journal of Solid-state Circuits, 2001
    Co-Authors: Mohamed Dessouky, Andreas Kaiser
    Abstract:

    A 1-V 1-mW 14-bit /spl Delta//spl Sigma/ modulator in a standard CMOS 0.35-/spl mu/m technology is presented. Special attention has been given to device reliability and power consumption in a switched-capacitor implementation. A locally bootstrapped symmetrical switch that avoids gate dielectric overstress is used in order to allow rail-to-rail Signal switching. The switch constant overdrive also enhances considerably circuit linearity. Modulator coefficients of a single-loop third-order topology have been optimized for low power. Further reduction in the power consumption is obtained through a modified two-stage opamp. Measurement results show that for an oversampling ratio of 100, the modulator achieves a dynamic range of 88 dB, a Peak Signal-to-noise ratio of 87 dB and a Peak Signal-to-noise-plus-distortion ratio of 85 dB in a Signal bandwidth of 25 kHz.

Switch Bootstrapping - One of the best experts on this subject based on the ideXlab platform.

  • Very Low-Voltage Digital-Audio
    IEEE Journal of Solid-State Circuits, 2001
    Co-Authors: Switch Bootstrapping
    Abstract:

    A 1-V 1-mW 14-bit ?? modulator in a standard CMOS 0.35- m technology is presented. Special attention has been given to device reliability and power consumption in a switched-capacitor implementation. A locally bootstrapped symmetrical switch that avoids gate dielectric overstress is used in order to allow rail-to-rail Signal switching. The switch constant overdrive also enhances considerably circuit linearity. Modulator coefficients of a single-loop third-order topology have been opti- mized for low power. Further reduction in the power consumption is obtained through a modified two-stage opamp. Measurement results show that for an oversampling ratio of 100, the modulator achieves a dynamic range of 88 dB, a Peak Signal-to-noise ratio of 87 dB and a Peak Signal-to-noise-plus-distortion ratio of 85 dB in a

Muhammad Mohsin Riaz - One of the best experts on this subject based on the ideXlab platform.