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 15 of 15 for “"Spurious free dynamic range (SFDR)"”.
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THEORETICAL INVESTIGATION AND PERFORMANCE ASSESSMENT OF REVERSED HYSTERESIS DELTA SIGMA MODULATOR DESIGN
… with continuous DSM and BDSM in terms of the spurious free dynamic range (SFDR), the signal to noise ratio (SNR), and the root mean square error (RMS). It studies the second-order R-HDSM. Finally, it compares the first-order R- HDSM and the second-order R-HDSM in terms of the signal to noise …
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High-Speed, High-Precision Digital -Analog Converters Designed for Spectral Performance
… this is also required for attaining the desired dynamic linearity. In the first prototype chip designed, the static calibration was in the form of a trim circuit external to the chip; in the second chip designed a novel self-trimming circuit which implements true background calibration was …
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The design and implementation of a wideband digital radio receiver
… signal processing technology, requiring high spurious free dynamic range (SFDR) and signal processing bandwidths. This dissertation investigates the extent to which current digital technology is able to meet these demands and compete with the proven architectures of analogue receivers. A …
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Investigating the use of hopped frequency waveforms for range and velocity measurements of radar targets
In the field of radar, High Range Resolution (HRR) profiles are often used to improve tracking accuracy in range and to allow the radar system to produce an image of an object. This work focuses on the use of HRR profiles generated using a sub-class of HRR techniques termed hopped frequency and …
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Cmos Design of an 8-Bit 1MS/S Successive Approximation Register ADC
… logic to avoid external high frequency clock, a dynamic comparator to improve linearity and a differential charger-distribution DAC with a monotonic capacitor switching procedure to achieve better power efficiency. This ADC is developed on a 0.18um TSMC process using Cadence Integrated Circuit …
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High-Resolution Nyquist -Rate Analog -to -Digital Converter
… nonlinearity (INL) of +0.95/-1.06 LSB, a spurious-free dynamic range (SFDR) of 91.6 dB, and a signal-to-noise ratio (SNR) of 74.2 dB with a 1-MHz input and a 20-MHz clock. The chip occupies an active area of 10.8 mm 2 including digital logic, output buffers, and bond pads, and consumes 720 …
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Oversampled pipline A/D converters with mismatch shaping
… obtained from this chip indicate that the Spurious Free Dynamic Range (SFDR) improves by 8.5dB to 76dB when mismatch shaping is used at an oversampling ratio of 4 and a sampling rate of 61MHz. The Signal to Noise and Distortion Ratio (SNDR) improves by 3dB and the maximum Integral …
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SHA-less pipeline ADC design with sampling clock skew calibration
… output with two comparators sensing out-of-range errors; a gradient-descent algorithm is used to adaptively adjust the timing of the sub-ADC to synchronize with that of the sample-and-hold (S/H) in the MDAC. A prototype 10-bit, 100-MS/s SHA-less pipeline ADC incorporating this calibration …
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Dynamic amplifiers for analog-to-digital converters
… to implement gain. In this dissertation, dynamic/latch-based/regenerative amplifiers are explored where interrupted regeneration is used to implement the gain function. First, a 6-b current-domain interpolating pipelined flash analog-to-digital converter (ADC) is presented, where a novel …
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Concept Demonstrator for MeerKAT Operation from 14.5 to 20 GHz
… gain of 76 dB, 40 dB image rejection and 27 dB spurious free dynamic range (SFDR). The simulated noise figure of the system using the measured noise figure of the LNA is 1.74 dB. The measured gain flatness of the receiver is ±7 dB due to poor performance of one of the amplifier modules used in …
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Evaluating FFT Implementations Developed for use on FPGA Hardware
… for radio astronomy applications and include Spurious Free Dynamic Range (SFDR), signal-to-noise ratio (SNR) preservation, quantisation noise, resource utilisation and achievable clock rates. A double precision floating point software FFT, the Fastest Fourier Transform in the West (FFTW), has …
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Low-power high-performance SAR ADC design with digital calibration techniques
… ratio (SNDR), and a 94.6-dB spurious free dynamic range (SFDR). At Nyquist frequency, the conversion figure of merit (FoM) is 50.8 fJ/conversion step, the best FoM up to date (2010) for 12-bit ADCs. The SAR ADC core occupies 0.06 mm2, while the estimated area the calibration …
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Design of indoor communication infrastructure for ultra-high capacity next generation wireless services
… in DAS can be replaced with low-cost, broadband free-space optical links, termed radio over free-space optics (RoFSO) links. RoFSO links enable the implementation of very high density DAS without the need for prohibitively expensive cabling infrastructure. A 16m RoFSO link requiring only manual …
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Message passing algorithms - methods and applications
… signal to noise and distortion ratio (SNDR), and spurious free dynamic range (SFDR)---are all focused on the faithful reproduction of observed waveforms, which is not of fundamental concern if the data converter is to be used in a digital communications system. Therefore, we propose other …