Results 271 to 280 of about 130,433 (340)

EER power amplifier modulator efficiency improvement using PWM with additional sigma-delta modulation

2018Systems of Signal Synchronization, Generating and Processing in Telecommunications (SYNCHROINFO), 2018
The article deals with the problem of increasing the efficiency of EER transmitters. The results of computer simulation of the EER power amplifier using transistors made by common MOSFET and advanced GaN technology in the form of graphs: the dependence ...
A. O. Bolotov, R. G. Kholyukov, O. Varlamov   +2 more
semanticscholar   +1 more source

65,536-QAM OFDM signal transmission over a fiber-THz system at 320 GHz with delta-sigma modulation.

Optics Letters, 2023
The transmission of a 65,536-ary quadrature amplitude modulation (QAM) orthogonal frequency division multiplexing (OFDM) signal supported by a hybrid fiber-terahertz (THz) multiple-input multiple-output (MIMO) system at 320 GHz is experimentally ...
Junting Shi, Jianjun Yu, Jiao Zhang, Min Zhu, Long Zhang, Kaihui Wang, Wen Zhou, Tangyao Xie, Jianguo Yu   +8 more
semanticscholar   +1 more source

W-band RoF polarization multiplexing system supports 1048576 QAM with delta-sigma modulation.

Optics Letters, 2023
We propose and experimentally verify a photonics-aided W-band millimeter wave (MMW) radio-over-fiber (RoF) polarization-multiplexed envelope detection system for high-order quadrature amplitude modulation (QAM) signals.
Jiaxuan Liu, Jianjun Yu, Tangyao Xie, Xiongwei Yang, Long Zhang, Yi Wei, T. Zheng, Jiao Zhang, Wen Zhou, Min Zhu, Jianguo Yu, F. Zhao   +11 more
semanticscholar   +1 more source

A Wireless Fiber Photometry System Based on a High-Precision CMOS Biosensor With Embedded Continuous-Time $\Sigma \Delta$ Modulation

IEEE Transactions on Biomedical Circuits and Systems, 2018
Fluorescence biophotometry measurements require wide dynamic range (DR) and high-sensitivity laboratory apparatus. Indeed, it is often very challenging to accurately resolve the small fluorescence variations in presence of noise and high-background ...
M. N. Khiarak, E. Martianova, Cyril Bories, S. Martel, Christophe D. Proulx, Yves De Koninck, B. Gosselin   +6 more
semanticscholar   +1 more source

Photonic-aided W-band dual-vector RF signal generation and detection enabled by bandpass delta-sigma modulation and heterodyne detection.

Optics Letters, 2023
We propose a photonic-aided dual-vector radio-frequency (RF) signal generation and detection scheme enabled by bandpass delta-sigma modulation and heterodyne detection.
Xinying Li, Xiaolong Pan, Dong Guo, Zhipei Li, Hengxin Yan, Chenchen Wang, Jiahao Bi, D. Wu, Chao Yu, Xinyu Liu, Xiangjun Xin, Qi Zhang, Ran Gao, Z. Dong   +13 more
semanticscholar   +1 more source

A Novel Wider Range Modulation for Indirect Matrix Converter Utilizing Delta-Sigma and Space Vector

IEEE transactions on power electronics, 2023
The coupling between the rectifier and inverter makes the modulation of the indirect matrix converter (IMC) relatively complicated. A novel modulation method is proposed in this letter, where a space vector modulation without a zero-voltage vector, which
Chaolei Ma, T. Shi, Zhichen Lin, Zhanqing Zhou, C. Xia   +4 more
semanticscholar   +1 more source

Chopper-stabilized sigma-delta modulator

1993 IEEE International Symposium on Circuits and Systems, 2002
A new architecture of the sigma-dela modulators using a chopper-stabilized configuration is described. It is shown that using this new architecture and without any other circuit techniques, a sigma-delta modulator becomes immune from the contamination of the inherent low-frequency noise, such as offset noise, flicker noise, and clock feedthrough noise.
Y.-H. Chang, C.-Y. Wu, T.-C. Yu
openaire   +1 more source

Digital Mobile Fronthaul Based on Delta-Sigma Modulation and Chirp-Managed Signal Transmission

Journal of Lightwave Technology, 2023
A novel digital mobile fronthaul (MFH) architecture combining delta-sigma modulation (DSM) and the chirp-managed technique is proposed to enhance spectral efficiency and dispersion tolerance.
Junting Shi, Jiaxuan Liu, Long Zhang, Li Zhao, Wen Zhou, Jianjun Yu   +5 more
semanticscholar   +1 more source

Tunable bandpass SIGMA delta modulators

2003 46th Midwest Symposium on Circuits and Systems, 2006
This paper examines different designs for tunable bandpass sigma delta modulators. Both discrete and continuous time implementations are considered. Comparison between different tuning methods is demonstrated using MATLAB simulations.
M.A. El-Nozahi, M. Dessouky, H.F. Ragai
openaire   +1 more source

Look-Ahead Sigma-Delta Modulation

2011
The generic noise-shaping quantizer model from chapter four is modified to support look-ahead, and a hypothetical sigma-delta modulator with look-ahead capability is derived. From here the main principles of look-ahead are explored, including linear modeling of a look-ahead modulator, and an overview of expected benefits and disadvantages of a look ...
Janssen, Erwin, van Roermund, Arthur
openaire   +2 more sources