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.
Results
Showing 1 to 20 of 31 for “"Delta Sigma Modulator"”.
-
ALL-OPTICAL DELTA-SIGMA MODULATOR DESIGN AND IMPLEMENTATION
… an approach to design and implement all-optical delta-sigma modulator (ODSM) has been expanded. The two main blocks of this modulator are “leaky integrator” and “bi-stable switch” designed and implemented by using active element like semiconductor optical amplifier (SOA) and other passive …
-
A Comparator-Based Switched-Capacitor delta sigma modulator
… applied to an industrial standard second order delta-sigma modulator originally based on op-amps. Due to the differences between CBSC and op-amp, a few architectural changes are necessary for the original modulator. Finally, the performance of transistor level simulation of this CBSC based …
-
Design of a continuous-time bandpass delta-sigma modulator
An 8th-order continuous-time (CT) bandpass delta-sigma modulator has been designed and simulated in a 65 nm CMOS process. This modulator achieves in simulation 25 MHz signal bandwidth at 250 MHz center frequency with a signal-to- noise ratio (SNR) of 75.5 dB. The modulator samples at 1 GS/s while …
-
A subsampling delta-sigma modulator for global navigation satellite systems
… the signals of interest. Continuous-Time (CT) Delta-Sigma (ΔΣ) modulation is an attractive candidate for subsampling Analog-to-Digital (A/D) conversion as it provides noise-shaping and inherent Anti-Alias (AA) filtering. However, the attenuation of the RF alias in the feedback path of the …
-
DESIGN AND PERFORMANCE ANALYSIS OF AN OPTICAL PROTERETIC DELTA-SIGMA MODULATOR
… toward developing all-optical binary delta sigma modulator (BDSM) [27] by changing its bistability to proteretic bistability in order to increase the modulator bandwidth frequency. An innovative delta sigma modulator called proteretic binary delta sigma modulator (PBDSM), which is …
-
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. …
-
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 …
-
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 …
-
High voltage sampling scheme independent of capacitor voltage coefficient for a delta sigma modulator
… paper presents a unique sampling scheme for a delta sigma modulator that is independent of common mode voltage. The rejection of common mode voltage is important in the application of electric vehicles and other large battery packs in order to accurately measure every cell on the stack with …
-
A continuous-time multi-stage noise-shaping delta-sigma modulator for next generation wireless applications
A continuous-time (CT) delta-sigma ([delta][sigma]) modulator for modern wireless communication applications is investigated in this thesis. Quantization noise is suppressed aggressively by increasing the effective order of the noise transfer function (NTF). In order to increase the effective order …
-
A superconducting bandpass delta-sigma modulator for direct analog-to-digital conversion of microwave radio
… (ADCs) with improved performance. A bandpass delta-sigma (AE) modulator is an attractive architecture for digitizing narrowband signals with high linearity and a large signal-to-noise ratio (SNR). The design of a superconducting bandpass AE modulator presented here exploits several advantages …
-
Study of substrate noise and techniques for minimization
… analog circuit, a switched capacitor delta-sigma modulator primarily through the asymmetrical parasitics of the input sampling circuit. Furthermore, since some of the parasitics are nonlinear with input voltage, substrate noise couples into the analog circuits producing an input signal …
-
optical engineer
In this research an approach to all optical delta sigma modulator (ADSM) has been elaborated. Two important components of ADSM; "leaky integrator" and "inverted bi-stable quantizer" were modeled, on the basis of cross gain modulation of the Semiconductor Optical Amplifier (SOA). The simulations …
-
New architecture for RF power amplifier linearization
… and adaptive digital predistortion using a [delta sigma] modulator for automatic inversion of power amplifier nonlinearity. Two-point architecture can be seen as a solution that extends the linearization bandwidth of the traditional feedback architecture while also offering decent digital …
-
High-Speed, Low-Spurious CMOS Analog -to -Digital Converter
… folding ADCs. Background offset trimming with a delta-sigma modulator is applied to compensate the random input offset of folding amplifiers. A subranging front-end is used in conjunction with the pipelined folding ADC to make the calibration feasible. The second prototype chip was measured to …
-
Multi-Bit Delta -Sigma Modulation Technique for Fractional-N Frequency Synthesizers
This thesis proposes a multi-bit Delta-Sigma modulation technique as a spur reduction method to enhance the overall synthesizer performance, and the oversampling modulator performance is analyzed with the consideration of practical design aspects for frequency synthesizers. A prototype fractional- …
-
Dynamic Element Matching Techniques For Delta-Sigma ADCs With Large Internal Quantizers
… enable high internal quantizer resolution in delta-sigma analog-to-digital converters. Increasing the quantizer resolution in a delta-sigma modulator can increase SNR, improve stability and reduce integrator power consumption. However, each added bit of quantizer resolution also causes an …
Page 1 of 2