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Switched-current sigma-delta modulation for A/D conversion

Switched-current sigma-delta modulation for A/D conversion

引用

1992 IEEE International Symposium on Circuits and systems, ISCAS 1992

作者： Crawley, Philip J. Roberts, Gordon W. Microelectronics and Computer Systems Laboratory Department of Electrical Engineering McGill University India

ISBN: (纸本)0780305930

This paper presents the design of a switched-current (SI) Double-Integrator Sigma-Delta Modulator (DISDM) for A/D conversion that is intended for voice-band (4kHz) telecommunication applications. With the creation of several new SI signal processing building blocks, a SI DISDM has been designed and laid out in Northern Telecom's 1.2 μm CMOS process having an area of 0.5 mm3 and a predicted power consumption of 2.5 mW. Transistor level simulation (SPICE) of the SI DISDM design shows that the circuit performs reasonable well, rating it at 12-bits of linear resolution. In comparisons with corresponding switched-capacitor DISDM designs, the SI version provides a dramatic reduction in both power and area requirements. But, more importantly, the SI design does not utilize linear capacitors and can be fabricated using a standard digital CMOS process. © 1992 IEEE.

关键词： Delta sigma modulation

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QUADRATIC DETECTORS FOR GENERAL NONLINEAR-ANALYSIS OF SPEECH

QUADRATIC DETECTORS FOR GENERAL NONLINEAR-ANALYSIS OF SPEECH

引用

INTERNATIONAL CONF ON ACOUSTICS, SPEECH AND SIGNAL PROCESSING

作者： ATLAS, L FANG, J Interactive Systems Design Laboratory Department of Electrical Engineering FT-10 University of Washington Seattle 98195 WA United States

ISBN: (纸本)0780305329

General quadratic detectors are defined and linked to the discrete-time version of Teager's model [1], to quadratic (also known as bilinear) time-frequency representations [3] and to other theory. As demonstrated on speech, these detectors have resolution advantages in simultaneous frequency selectivity and temporal resolution over linear detectors. Preprocessing for pitch detection using the detector is investigated, and it is shown that fast preprocessing for pitch tracking can be obtained by a suitable choice of coefficients. Simple speaker-independent phoneme classification based on a quadratic preprocessor and an artificial neural network is also examined, and comparative results indicate that a quadratic preprocessor facilitates the accurate estimation of waveform features. Our preliminary results also suggest that these waveform features may provide useful information for fine phonetic distinctions. © 1992 IEEE.

关键词： Neural networks

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HISTOGRAM-BASED DISTORTION AND GAIN TRACKING TESTING OF AN 8-BIT PCM MIXED ANALOG-DIGITAL IC CHIP 35

HISTOGRAM-BASED DISTORTION AND GAIN TRACKING TESTING OF AN 8...

引用

35TH MIDWEST SYMP ON CIRCUITS AND systems

作者： TONER, MF ROBERTS, GW Microelectronics and Computer Systems Laboratory Department of Electrical Engineering McGill University 3480 University Street Montreal H3A 2A7 Canada

ISBN: (纸本)0780305108

The effective number of bits of a linear Analog-to-Digital Converter (ADC) can be computed using the code density histogram method. In this article, the technique is adapted to test an oversampling or Sigma-Delta (ΣΔ) converter. It is assumed that the device under test includes a ΣΔ modulator, a decimator, and a μ-law compressor. The analog stimulus to the device under test is supplied by a precision signal generator, and the code density histogram of the 8-bit μ-law compressed output of the ADC is analyzed to determine whether the converter is performing within its specifications. This paper presents simulation results which were obtained using a very simple model for the ADC and additive white Gaussian noise. © 1992 IEEE.

关键词： Timing circuits

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Built-in self-diagnostic by space-time compression of test responses

Built-in self-diagnostic by space-time compression of test r...

引用

1992 IEEE VLSI Test Symposium, VLSI 1992

作者： Karpovsky, M.G. Chaudhry, S.M. Research Laboratory of Design and Testing of Computer Hardware Department of Electrical Computer and Systems Engineering Boston University BostonMA02215 United States

ISBN: (纸本)0780306236

Presents two different methodologies for built-in self-diagnostic of boards and systems by space-time compression of test responses. The first method, soft decision, uses nonbinary multiple error-correcting codes to obtain space-time signatures. These obtained signatures and the corresponding precomputed references are compared and magnitudes of distortions in signatures are analyzed to identify faulty components. The second method, hard decision, makes use of the information indicating whether the corresponding signatures are distorted or not. Both approaches show considerable savings in hardware overheads when compared with a straightforward approach where a separate signature is required for every component. A transition from the soft to hard decision approach results in an increase in the number of signatures required for diagnostic but at the same time it results in a decrease in the complexity of a fault locating algorithm. Results pertaining to VLSI implementations are presented where the hardware overhead is estimated in terms of two-input equivalent gates. © 1992 IEEE.

关键词： Data compression

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Switched-current sigma-delta modulation for A/D conversion

Switched-current sigma-delta modulation for A/D conversion

引用

IEEE International Symposium on Circuits and systems (ISCAS)

作者： P.J. Crawley G.W. Roberts Microelectronics and Computer Systems Laboratory Department of Electrical Engineering McGill University Canada

The authors present the design of a switched-current (SI) double-integrator sigma-delta modulator (DISDM) for analog-to-digital (A/D) conversion that is intended for voiceband (4-kHz) telecommunication applications. With the creation of several new SI signal processing building blocks, a SI DISDM has been designed and laid out in Northern Telecom's 1.2- mu m CMOS process having an area of 0.5 mm/sup 2/ and a predicted power consumption of 2.5 mW. Transistor-level simulation (SPICE) of the SI DISDM design shows that the circuit performs reasonably well, rating it at 12 b of linear resolution. In comparison with corresponding switched-capacitor DISDM designs, the SI version provides a dramatic reduction in both power and area requirements; but, more importantly, the SI design does not utilize linear capacitors and can be fabricated using a standard digital CMOS process.< >

关键词： Delta-sigma modulation Circuits Digital filters Telecommunication switching Sampling methods Digital modulation Low pass filters Signal processing Delta modulation Frequency conversion

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Histogram-based distortion and gain tracking testing of an 8-bit PCM mixed analog-digital IC chip

Histogram-based distortion and gain tracking testing of an 8...

引用

Midwest Symposium on Circuits and systems (MWSCAS)

作者： M.F. Toner G.W. Roberts Microelectronics and Computer Systems Laboratory Department of Electrical Engineering McGill University Montreal Canada

The effective number of bits of a linear analog-to-digital converter (ADC) can be computed using the code density histogram method. The technique is adapted to test an oversampling or sigma-delta ( Sigma Delta ) converter. It is assumed that the device under test includes a Sigma Delta modulator, a decimator, and a mu -law compressor. The analog stimulus to the device under test is supplied by a precision signal generator, and the code density histogram of the 8-b mu -law compressed output of the ADC is analyzed to determine whether the converter is performing within its specifications. Simulation results which were obtained using a very simple model for the ADC and additive white Gaussian noise are presented.< >

关键词： Integrated circuit testing Phase change materials Analog-digital conversion Analog-digital integrated circuits Analog integrated circuits Circuit testing Production Costs Signal to noise ratio Digital signal processing

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Quadratic detectors for general nonlinear analysis of speech

Quadratic detectors for general nonlinear analysis of speech

引用

International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： L. Atlas J. Fang Interactive Systems Design Laboratory Department of Electrical Engineering University of Washington Seattle WA USA

General quadratic detectors are defined and linked to the discrete-time version of Teager's model (1980), to quadratic (also known as bilinear) time-frequency representations, and to other theory. As demonstrated on speech, these detectors have resolution advantages in simultaneous frequency selectivity and temporal resolution over linear detectors. Preprocessing for pitch detection using the detector is investigated, and it is shown that fast preprocessing for pitch tracking can be obtained by a suitable choice of coefficients. Simple speaker-independent phoneme classification based on a quadratic preprocessor and an artificial neural network is also examined, and comparative results indicate that a quadratic preprocessor facilitates the accurate estimation of waveform features. The preliminary results also suggest that these waveform features may provide useful information for fine phonetic distinctions.< >

关键词： Speech analysis Detectors Finite impulse response filter Frequency Nonlinear filters Band pass filters Artificial neural networks Speech coding Speech recognition Equations

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An information-theoretic approach to positive time-frequency distributions

An information-theoretic approach to positive time-frequency...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： P.J. Loughlin J.W. Pitton L.E. Atlas Interactive Systems Design Laboratory Department of Electrical Engineering University of Washington Seattle WA USA

The principle of minimum cross entropy (MCE) is used to generate positive distributions in the Cohen-Posch (1985) class of proper time-frequency distributions (TFDs). The MCE-TFDs are not only intuitively satisfying, but they also yield the correct marginals, have strong finite support, and are everywhere nonnegative. The usual cross-term artifacts that hinder interpretation of other time-frequency representations (most notably, the Wigner-Ville) are not a problem with the MCE-TFDs. Examples of speech and chirps are given and compared to the spectrogram. An interesting observation in the case of speech is that spectrograms more closely resemble time-conditional-frequency distributions (narrowband) or frequency-conditional-time distributions (wideband) than they do joint time-frequency distributions.< >

关键词： Time frequency analysis Spectrogram Entropy Chirp Spectral analysis Speech synthesis Laboratories Wideband Signal resolution Signal generators

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Multiple signature analysis: a framework for built-in self-diagnostic

Multiple signature analysis: a framework for built-in self-d...

引用

International Symposium on Fault-Tolerant Computing (FTCS)

作者： M.G. Karpovsky S.M. Chaudhry L.B. Levitin Research Laboratory of Design and Testing of Computer Hardware Department of Electrical Computer and Systems Engineering Boston University Boston MA USA

A framework, based on nonbinary multiple error correcting codes, for built-in self-diagnostics is presented. Novel space-time compressors are proposed for test response compression and fault diagnosis. Fault-detecting and locating capabilities for space-time compressors are analyzed in the case when nonbinary Reed-Solomon codes are used. Fault-masking and diagnosis probabilities for the chip-independent error model are estimated. For this error-model, the fault-masking probabilities are analyzed using the weight distributions of Reed-Solomon codes.< >

关键词： Circuit faults Compressors Fault diagnosis Automatic testing System testing Built-in self-test electrical fault detection Fault detection Error correction codes Laboratories

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Built-in self-diagnostic by space-time compression of test responses

Built-in self-diagnostic by space-time compression of test r...

引用

VLSI Test Symposium

作者： M.G. Karpovsky S.M. Chaudhry Research Laboratory of Design and Testing of Computer Hardware Department of Electrical Computer and Systems Engineering Boston University Boston MA USA

关键词： Automatic testing Fault diagnosis System testing Hardware Error correction codes Built-in self-test Information analysis Laboratories design engineering systems engineering and theory

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