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Search Results (3)

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Keywords = sub-Nyquist spurs

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12 pages, 2117 KiB  
Article
A Wideband Timing Mismatch Calibration Design for Time-Interleaved Analog-to-Digital Converters with Fast Convergence
by Guojing Huang, Dong Xu, Peng Gao, Min Zhou, Jiarui Liu and Zhiyu Wang
Electronics 2024, 13(13), 2459; https://doi.org/10.3390/electronics13132459 - 24 Jun 2024
Viewed by 1221
Abstract
This paper presents a design for timing mismatch calibration in a TIADC (Time-Interleaved Analog-to-Digital Converter) with wideband inputs. By exploiting the approximately linear relationship between the autocorrelation properties of sub-ADCs and timing mismatch, we achieve rapid convergence of error estimation. A low-cost detection [...] Read more.
This paper presents a design for timing mismatch calibration in a TIADC (Time-Interleaved Analog-to-Digital Converter) with wideband inputs. By exploiting the approximately linear relationship between the autocorrelation properties of sub-ADCs and timing mismatch, we achieve rapid convergence of error estimation. A low-cost detection method is proposed based on the convergent monotonicity of the Least Mean Square (LMS) algorithm, which can automatically correct the calibration direction when the input signal goes beyond the Nyquist zone. Physical test results indicate that the spurs caused by timing mismatch can be suppressed by 26–30 dB using the proposed method. Full article
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12 pages, 2788 KiB  
Article
Adaptive Linearization for the Sub-Nyquist Photonic Receiver Based on Deep Learning
by Liyuan Zhao, Jianghua Zhang, Lei Huang, Yuanxi Peng, Ke Yin, Xin Zheng, Zhuohang Zhang, Meili Shen, Denghui Song and Hongxiao Niu
Photonics 2022, 9(11), 794; https://doi.org/10.3390/photonics9110794 - 25 Oct 2022
Cited by 2 | Viewed by 1838
Abstract
Due to the nonlinear and aliasing effects, the sub-Nyquist photonic receiver for radio frequency (RF) signals with large instantaneous bandwidth suffers limited dynamic range and noise performance. We designated a deep residual network (Resnet) to realize adaptive linearization across 40 GHz bandwidth. In [...] Read more.
Due to the nonlinear and aliasing effects, the sub-Nyquist photonic receiver for radio frequency (RF) signals with large instantaneous bandwidth suffers limited dynamic range and noise performance. We designated a deep residual network (Resnet) to realize adaptive linearization across 40 GHz bandwidth. In contrast to conventional linearization methods, the deep learning method achieves the suppression of multifactorial spurious distortions and the noise floor simultaneously. It does not require an accurate calculation of the nonlinear transfer function or prior signal information. The experiments demonstrated that the proposed Resnet could improve the spur-free dynamic range (SFDR) and the signal-to-noise ratio (SNR) significantly by testing with single-tone signals, dual-tone signals, wireless communication signals, and modulated radar signals. Full article
(This article belongs to the Section Optical Communication and Network)
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13 pages, 5773 KiB  
Article
Analysis of Time and Frequency Response for Single/Multi-Tone Stimulus Harmonic Phase-Reference Based on Prime Number Algorithm
by He Yu, Cong Wang, David A. Humphreys, Maoliu Lin, Luqman Ali and Fanyi Meng
Electronics 2020, 9(11), 1836; https://doi.org/10.3390/electronics9111836 - 3 Nov 2020
Viewed by 2459
Abstract
We present a spectrally-dense phase-reference and its calibration for nonlinear vector network analyzers (NVNAs) using a step recovery diode (SRD) comb-generator with a multi-tone stimulus. Frequency selection for multi-tone stimulus based on prime number algorithms was used with the Digital Real-Time Oscilloscope (DRTO) [...] Read more.
We present a spectrally-dense phase-reference and its calibration for nonlinear vector network analyzers (NVNAs) using a step recovery diode (SRD) comb-generator with a multi-tone stimulus. Frequency selection for multi-tone stimulus based on prime number algorithms was used with the Digital Real-Time Oscilloscope (DRTO) to avoid the sub-Nyquist spurs components and to increase the effective sampling rate so that the waveform can be observed in greater detail. The measured results were calibrated to minimize drift and jitter and achieved excellent agreement between the prime number and the exact frequency strategies except at the sub-Nyquist frequencies. The analysis indicates that the prime number selected frequencies show significantly improved performance by avoiding the DRTO distortion components. We have verified the validity of the method described in this paper by experimental measurement results. Full article
(This article belongs to the Section Microwave and Wireless Communications)
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