Results 211 to 220 of about 29,227 (261)
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Oversampled Sigma-Delta Modulation
IEEE Transactions on Communications, 1987Summary: Oversampled sigma-delta modulation has been proposed as a practical implementation for high rate analog-to-digital conversion because of its simplicity and its robustness against circuit imperfections. To date, mathematical developments of the basic properties of such systems have been based either on simplified continuous-time approximate ...
exaly +2 more sources
Proceedings of the 2003 International Symposium on Circuits and Systems, 2003. ISCAS '03., 2003
/spl Sigma//spl Delta/ modulators for portable applications are presented operating within a large range of supply voltages. A 2/sup nd/ order and a cascaded 3rd order modulator are designed in Switched-Opamp (SO) technique with common mode level shift.
Jens Sauerbrey +3 more
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/spl Sigma//spl Delta/ modulators for portable applications are presented operating within a large range of supply voltages. A 2/sup nd/ order and a cascaded 3rd order modulator are designed in Switched-Opamp (SO) technique with common mode level shift.
Jens Sauerbrey +3 more
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IEEE Transactions on Communications, 1992
A modulo sigma-delta modulator is introduced, and the behavior of the quantization error is derived. The system consists of a modulo limiter followed by a sigma-delta modulator. The limiter confines the input to the no-overload region of the sigma-delta modulator, and the modulo arithmetic performed by the limiter is amenable to recently developed ...
Wu Chou, Robert M. Gray
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A modulo sigma-delta modulator is introduced, and the behavior of the quantization error is derived. The system consists of a modulo limiter followed by a sigma-delta modulator. The limiter confines the input to the no-overload region of the sigma-delta modulator, and the modulo arithmetic performed by the limiter is amenable to recently developed ...
Wu Chou, Robert M. Gray
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Pulse-width modulation in sigma-delta modulators
Proceedings of 2010 IEEE International Symposium on Circuits and Systems, 2010Time-encoding machines map analog or multi-bit digital signals to a binary stream. The information contained in the input signal is preserved by the high resolution achieved in the time domain. Pulse-Width Modulators (PWMs) rely on a similar operation principle.
Francisco Colodro Ruiz +1 more
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Sigma-delta modulation neural networks
IEEE International Conference on Neural Networks, 2002It is shown that sigma-delta ( Sigma - Delta ) modulation can be used to model the information coding process of biological neurons. Signal analysis results demonstrate that Sigma - Delta modulation processes a noise shaping property by which signal and noise are separated into low (baseband) and high frequency bands, respectively. Restoring the signal
Kwan F. Cheung, Patrick Y. H. Tang
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A sigma-delta modulator for bio-applications
2013 IEEE International Symposium on Consumer Electronics (ISCE), 2013This paper presents a new concept of sigma-delta modulator (SDM) for biomedical applications. It combines switched-capacitor (SC) and switched-opamp (SOP) techniques. To Avoid signal distortion and nonlinear resistance in implementing the CMOS resistor of the SDM, an approach, replacing SC modulator with SOP modulator and reducing power consumption of ...
Cihun-Siyong Alex Gong +5 more
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Stability analysis of a sigma delta modulator
Proceedings of the 2003 International Symposium on Circuits and Systems, 2003. ISCAS '03., 2003This paper illustrates how an adaptive iterative method may be used to verify large signal input stability of a third-order sigma delta modulator across a range of DC inputs, once the initial design parameters the system have been determined using small signal nonlinear stability analysis.
Jianxin Zhang +4 more
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Two-stage sigma-delta modulation
IEEE Transactions on Acoustics, Speech, and Signal Processing, 1990An exact analysis of the nonlinear difference equation describing a discrete time two-stage sigma-delta quantizer with DC and sinusoidal inputs is presented. It is shown that for DC inputs, the binary quantizer error of the second quantizer, which appears at the output of the modulator as a second-order difference, is asymptotically white, uniformly ...
Ping Wah Wong, Robert M. Gray
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2017
This chapter presents a theoretical overview of analog to digital conversion using Sigma-Delta Modulation (ΣΔM). Its oversampling characteristic and working principles are explained and compared with Nyquist rate converters. Important performance parameters, such as signal to noise ratio (SNR), effective number of bits (ENOB), and oversampling ratio ...
David Fouto, Nuno Paulino
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This chapter presents a theoretical overview of analog to digital conversion using Sigma-Delta Modulation (ΣΔM). Its oversampling characteristic and working principles are explained and compared with Nyquist rate converters. Important performance parameters, such as signal to noise ratio (SNR), effective number of bits (ENOB), and oversampling ratio ...
David Fouto, Nuno Paulino
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Multirate-multibit sigma-delta modulators
2000 IEEE International Symposium on Circuits and Systems. Emerging Technologies for the 21st Century. Proceedings (IEEE Cat No.00CH36353), 2002A multirate architecture for implementation of SD modulator is proposed in this paper. The performance of the called MM (multirate-multibit) SD modulator is the same that a conventional multibit SD modulator working at the clock rate of the first integrator, but the ADC in the forward path is replaced by an increase at the clock rate of the second ...
Francisco Colodro +3 more
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