Results 291 to 300 of about 59,486 (332)
Some of the next articles are maybe not open access.
Integrated optical sigma‐delta modulators
Optical Engineering, 1996Abstract : Modern avionics equipment, such as super resolution direction-finding systems, now require resolutions on the order of 20 to 22 bits. Oversampled analog-to-digital converter architectures offer a means of exchanging resolution in time for that in amplitude and represent an attractive approach to implementing precision converters without the ...
openaire +1 more source
2012
The sigma-delta modulator is a specific algorithm to convert low-bandwidth signals into a digital data stream. In the first section the effects of oversampling are described both for the analog-to-digital converter as well as for the analog-to-digital converter.
openaire +1 more source
The sigma-delta modulator is a specific algorithm to convert low-bandwidth signals into a digital data stream. In the first section the effects of oversampling are described both for the analog-to-digital converter as well as for the analog-to-digital converter.
openaire +1 more source
2018
So far only the possibility of creating stable, high-order Sigma-Delta modulators through a careful loop architecture choice and/or using multi-bit quantization has been considered. As demonstrated in previous chapters, although this approach can yield effective high-order loop designs, it also results in mathematically intensive (the Schreier’s ...
openaire +1 more source
So far only the possibility of creating stable, high-order Sigma-Delta modulators through a careful loop architecture choice and/or using multi-bit quantization has been considered. As demonstrated in previous chapters, although this approach can yield effective high-order loop designs, it also results in mathematically intensive (the Schreier’s ...
openaire +1 more source
Poly-phase sigma-delta modulation
IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing, 1997A new circuit is described for the implementation of analog sigma-delta modulation. It is based upon the use of a poly-phase sampler with the aim of obtaining high over-sampling ratios at low clock frequencies. A detailed analysis of second-order systems is made to predict its performance.
openaire +1 more source
A laboratory sigma-delta modulator
Transactions of the Institute of Measurement and Control, 1991A simple method of analysing the limit-cycling behaviour of a sigma-delta modulator is introduced which is used to determine the performance of a system designed specifically for student use. The analysis is extended to predict the closed-loop performance of the modulator.
C.P. Lewis, T.G. Hesketh
openaire +1 more source
Choice of Sigma-Delta Modulation
2012This chapter presents a comparative study of all-digital ΣΔM structures as part of the multi-standard frequency synthesizer [1]. As discussed previously, ΣΔ modulation is used to enable fractional frequency synthesis by modulating a sequence of division values with a desired fractional mean and providing the added advantage of noise shaping. It is also
Jad G. Atallah, Mohammed Ismail
openaire +1 more source
Efficient Trellis Sigma-Delta Modulation
2011In chapter eight, an efficient derivative of the Trellis sigma-delta modulator, called the Efficient Trellis sigma-delta modulator, is introduced. Instead of exploring 2 N solutions in parallel, only M solutions out of the possible 2 N are tracked. This is possible since only a fraction of all the 2 N solutions contributes to the final output.
Janssen, Erwin, van Roermund, Arthur
openaire +1 more source
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 ...
F. Colodro +3 more
openaire +1 more source
Basics of Sigma-Delta Modulation
2011This chapter provides a basic introduction to sigma-delta modulation in general. It first discusses the use of sigma-delta modulation for analog-to-digital, digital-to-digital, and digital-to-analog conversion, after which the most popular sigma-delta structures are presented. A procedure for basic linear modeling of sigma-delta modulators is presented
Janssen, Erwin, van Roermund, Arthur
openaire +2 more sources
NTF-Improved Delta-Sigma Modulation Supported 65536 QAM Signal for Mobile Fronthaul
Journal of Lightwave TechnologyIn this article, a support 65536 QAM signal mobile fronthaul (MFH) architecture based on the noise transfer function (NTF)-improved delta-sigma modulation (DSM) was proposed and demonstrated by experiment. In the NTF-improved DSM, the extended Lee's rule
Xiongwei Yang +6 more
semanticscholar +1 more source