An Adaptive Resolution High-speed Acquisition Architecture Based on Wideband Spectrum Sensing
Xuetao Liu, Kuojun Yang, Peng Ye, Wuhuang Huang, Zhixiang Pan, Chengyang Li · 2025
To acquire more complex signals with several GHz bandwidth, a high-speed acquisition system with a high sampling rate and resolution is needed to improve acquisition accuracy. The traditional Time Interweaving (TI) and Digital Bandwidth Interweaving (DBI) architectures can improve the sampling rate of the acquisition system, but they cannot improve resolution. Therefore, an adaptive resolution high-speed acquisition architecture is proposed. Based on the wideband spectrum sensing, the dynamic adjustment of the sampling rate and resolution is deployed according to the frequency of the input signal under the three modes which are $20 \mathrm{GSa} / \mathrm{s}$ with $12 \mathrm{bits}, 10 \mathrm{GSa} / \mathrm{s}$ with 13bits, and 5GSa/s with 14bits. Compared with the traditional 20 GSa /s, 12 bits acquisition architecture, acquiring signals within 2 GHz, the signal-to-noise ratio (SNR) increases 6.34 dB, the effective number of bits (ENOB) increases 1.05, and for signals within 4 GHz, the SNR increases 3.15 dB, the ENOB increases 0.52. Experimental results show that this architecture can effectively improve the system’s acquisition accuracy.