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Showing 1 to 20 of 56 for “"Sigma Delta"”.
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A bandpass sigma delta modulator IF receiver
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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A fourth order [Sigma] [Delta] bandpass modulator
A fourth order bandpass [Sigma] [Delta] modulator is proposed to digitize signals from a MEMS gyroscope. The modulator samples the amplitude-modulated signal at eight times the carrier frequency and achieves an SNR of 82dB with a sampling frequency of 640kHz and a bandwidtn o 1.oKnz. ms document …
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Digital calibration of nonlinear memory errors in sigma-delta ADCs
… error model are proposed to linearize sigma-delta (ΣΔ) modulators. A sequential power series (a special form of Volterra series) is found sufficient to model the nonlinear memory errors in a discrete-time integrator (DTI), which entails the application of adaptive polynomial transversal …
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An improved sigma-delta modulator for digitizing carrier band measurements
Draper Laboratory currently employs a third-order Sigma-Delta modulator to digitize the outputs from microelectromechanical sensors at the intermediate frequency prior to demodulation inside a field programmable gate array. This modulator, which is built on a .5[mu]m CMOS process, is to be used as …
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A continuous time sigma-delta modulator for digitizing carrier band measurements
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.
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The effects of excess loop delay in continuous-time sigma-delta modulators
Continuous-time sigma-delta (CT-Sigma Delta) modulators have recently received great attention in the academia as well as in the industry. Despite the improved understanding of the operation of CT-Sigma Delta modulators, the problem due to excess loop delay that arises from timing mismatch and …
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Tunable narrow bandpass Sigma-Delta analog-to-digital conversion for mobile communication terminals
A whole-of-band receiver structure is proposed. In this structure, the whole mobile band (125 channels for GSM) is digitized and channel selection is performed using DSP filters. The ADC is a critical component in this structure, requiring 13bits resolution at sampling rate of 50MHz . A modified ΣΔ …
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Low-power switched-capacitor amplifier and Sigma-Delta modulator design for integrated biosensor applications
… of a low power switched-capacitor amplifier and Sigma-Delta modulator for use as an analog-to-digital converter. The switched-capacitor amplifier achieves a gain of 40dB with -63.7dB total harmonic distortion while using 6.82μW and occupying 0.076mm2 silicon area. The Sigma-Delta modulator …
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Design, analysis and evaluation of sigma-delta based beamformers for medical ultrasound imaging applications
The inherent analogue nature of medical ultrasound signals in conjunction with the abundant merits provided by digital image acquisition, together with the increasing use of relatively simple front-end circuitries, have created considerable demand for single-bit beamformers in digital …
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Design and Realization of a Single Stage Sigma-Delta ADC With Low Oversampling Ratio
… process toward a high speed and high resolution sigma-delta A/D converter. This dissertation focuses on the design of a single-stage sigma-delta A/D converter with very low oversampling ratio for the wireless application. An architecture for a multibit single-stage delta-sigma A/D converter with …
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An optical-electrical sub-sampling down-conversion receiver with continuous-time [Sigma] [Delta] modulation
… down-conversion receiver that employs [Sigma] [Delta] modulation. Accurate sub-sampling of an electrical RF signal in the optical domain is achieved by using a low-jitter mode-locked-laser and a high-bandwidth interferometer. The sub-sampled information is then digitized by an …
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Analysis and simulation of a CIC-filter-based multiplexed-input sigma-delta analog-to-digital converter
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.
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