Results 261 to 270 of about 130,433 (340)

A Different View of Sigma-Delta Modulators Under the Lens of Pulse Frequency Modulation [Feature]

IEEE Circuits and Systems Magazine, 2023
The fact that VCO-ADCs produce noise-shaped quantization noise suggests that a link between frequency modulation and Sigma-Delta modulation should exist.
V. Medina, Pieter Rombouts, Luis Hernandez-Corporales   +2 more
semanticscholar   +1 more source

Hexagonal Sigma-Delta modulation

IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications, 2003
A novel application and generalization of sigma-delta (/spl Sigma//spl Delta/) modulation has emerged in three-phase power-electronic converters. A conventional /spl Sigma//spl Delta/ modulator with scalar signals and binary quantizer is generalized to a /spl Sigma//spl Delta/ modulator with vector signals and a hexagonal quantizer.
G. Luckjiff, I. Dobson
openaire   +1 more source

Trellis Sigma-Delta Modulation

2011
Chapter seven presents a full analysis of the Trellis sigma-delta modulation algorithm. This algorithm is the first pruned look-ahead sigma-delta modulation algorithm found in literature. It is a derivative of the full look-ahead algorithm and uses concepts from Trellis (Viterbi) decoding, hence the name. In the Trellis sigma-delta modulation algorithm,
Janssen, Erwin, van Roermund, Arthur
openaire   +2 more sources

Switched current sigma-delta modulators

1995 International Symposium on VLSI Technology, Systems, and Applications. Proceedings of Technical Papers, 2002
Oversampling sigma-delta (/spl Sigma//spl Delta/) modulators using switched current (SI) techniques are presented. The first modulator is a 1-1 MASH modulator. The second structure is a second-order loop which is formed by a 1-bit quantizer with two feedback loops.
A. Yilmaz, K.C. Wong, K.S. Chao
openaire   +1 more source

8192QAM Signal Transmission by an IM/DD System at W-Band Using Delta-Sigma Modulation

IEEE Photonics Technology Letters, 2023
We present a low-cost intensity-modulated direct detection (IM/DD) system for the transmission of high-order QAM signals at millimeter-wave (MMW) band at 87 GHz.
Jiaxuan Liu, Junjie Ding, Chen Wang, Kaihui Wang, T. Zheng, Jianjun Yu   +5 more
semanticscholar   +1 more source

Sigma-Delta Modulation

2017
This chapter presents a theoretical overview of analog to digital conversion using Sigma-Delta Modulation (ΣΔM). Its oversampling characteristic and working principles are explained and compared with Nyquist rate converters. Important performance parameters, such as signal to noise ratio (SNR), effective number of bits (ENOB), and oversampling ratio ...
David Fouto, Nuno Paulino
openaire   +1 more source

Sigma Delta Modulator Design Automation

2007 International Conference on Communications, Circuits and Systems, 2007
Sigma delta modulator design automation from system to circuit is presented in this paper. The sigma delta modulator design flow is separated into the system and circuit level design. It often adopts Matlab Simulink for the system level design and utilizes circuit simulator Spectre for the circuit level design.
null Chung-Ming Hsieh, null Hung-Wei Chiu   +1 more
openaire   +1 more source

Digital Filters for Sigma-Delta Modulation in Wireless Communications

International Semiconductor Conference, 2019
This paper presents the effect of digital filtering in a sigma-delta modulation (SDM) used in wireless communications. SDM is widely used in digital-to-analog conversion because it offers high signal to noise ratio and distortion rate and low power and ...
I. Pirnog, I. Marcu, A.M.C. Drãgulinescu, C. Oprea   +3 more
semanticscholar   +1 more source

SNR improved digital-delta-sigma-modulation radio-over-fiber scheme for D-band 4.6-km photonics-aided wireless fronthaul.

Optics Letters, 2023
We propose a digital-delta-sigma-modulation radio-over-fiber (DDSM-RoF) scheme for wireless fronthaul and validate it experimentally in a D-band photonics-aided RoF transmission system.
Mingxu Wang, Jianjun Yu, Xianmin Zhao, Weiping Li, Yi Wei, Xiongwei Yang, Junting Shi, Chengzhen Bian, Tangyao Xie, F. Zhao, Jianguo Yu, Wen Zhou, Kaihui Wang   +12 more
semanticscholar   +1 more source

4096-QAM OFDM THz-Over-Fiber MIMO Transmission Using Delta-Sigma Modulation

IEEE Photonics Technology Letters, 2023
A terahertz (THz)-over-fiber multiple-input multiple-output (MIMO) transmission of 4096-ary quadrature amplitude modulation (QAM) orthogonal frequency division multiplexing (OFDM) supported by 46-GBaud quadrature phase shift keying (QPSK) signal at 320 ...
Junting Shi, Jianjun Yu, Jiao Zhang, Min Zhu, Long Zhang, Jiaxuan Liu, Kaihui Wang, Wen Zhou   +7 more
semanticscholar   +1 more source