Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 11 of 11 for “"Delta-sigma modulators"”.
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Continuous-Time Delta-Sigma Modulators for Wireless Communication
… papers that focus on the continuous-time (CT) Delta-Sigma modulator (DSM) as ADC. Paper I analyses the performance degradation of dynamic nonlinearity in the feedback DAC of the DSM, caused by Vth mismatch in the current-switching (differential) pair of a current-steering DAC. A model is …
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Continuous-Time Delta-Sigma Modulators for Ultra-Low-Power Radios
… an ADC, but in the last decade, continuous-time Delta-Sigma modulators (CT DSMs) have become popular due to their potential of achieving low power consumption and the inherent anti-alias filtering. This thesis investigates different implementations of CT DSMs intended for an ultra-low-power (ULP) …
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An Exploratory Study of Pulse Width and Delta Sigma Modulators
… noise shaping and noise producing qualities of Delta-Sigma Modulators (DSM) and Pulse-Width Modulators (PWM). DSM has long been dominant in the Delta Sigma Analog-to-Digital Converter (DSADC) as a noise-shaped quantizer and time discretizer, while PWM, with a similar self oscillating structure, …
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Successive-approximation-register based quantizer design for high-speed delta-sigma modulators
High-speed delta-sigma modulators are in high demand for applications such as wire-line and wireless communications, medical imaging, RF receivers and high-definition video processing. A high-speed delta-sigma modulator requires that all components of the delta-sigma loop operate at the desired …
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A continuous-time multi-stage noise-shaping delta-sigma modulator with analog delay
A new continuous-time multi-stage noise-shaping delta-sigma modulator has been designed. This modulator provides high resolution and robust stability characteristics which are the primary advantages of the conventional multi-stage noise-shaping architecture. At the same time, previous critical …
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THEORETICAL INVESTIGATION AND PERFORMANCE ASSESSMENT OF REVERSED HYSTERESIS DELTA SIGMA MODULATOR DESIGN
This dissertation studies a unique delta sigma modulator (DSM), known as reversed hysteresis delta sigma modulator (R-HDSM). This modulator is appropriate for ultra-high speed analog-to-digital converters, which can be used for communications and signal processing systems and their applications. …
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Frequency selective analog to digital converter design : optimality, fundamental limitations, and performance bounds
… optimal ADCs that can be viewed as generalized Delta-Sigma Modulators (DSMs). An analytic expression for the performance of generalized DSMs is given. Furthermore, separation of quantization and control for this class of ADCs is proven under some technical conditions. When the technical …
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Analysis, simulation and design of nonlinear RF circuits
… frequency dividers (ILFD) and digital delta-sigma modulators (DDSM). Both of these circuits are employed in fractional-N frequency synthesizers. Several simulation methods are proposed to capture the locking range of an ILFD, such as the Warped Multi-time Partial Differential Equation …
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Design of a Low Power Delta Sigma Modulator for Analog to Digital Conversion
… Analog to digital conversion based on Delta Sigma modulation offers an optimal solution to the above problems. It is based on digital signal processing theory and offers benefits such as small footprint, high precision, noise de-sensitivity, and low power consumption. This thesis …
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Design techniques for Power-Efficient Delta-Sigma Analogue-to-Digital Converters
… from recent publications. This is a feed-forward Delta-Sigma Modulator (DSM), hybridised with a Successive Approximation Register (SAR) ADC as a quantiser, which also takes the role of a summing node, to further reduce the power consumption. A continuous-time amplification front-end is added …