基于数字带宽交替的40GSPS超宽带数据采集研究

超宽带高速数据采集在通信、雷达及测试仪器等多个领域有着重要应用，但系统带宽和采样率受限于放大器及模数转换器等器件，突破带宽和采样率指标成为亟需解决的难题。时间交替并行采样能提高采样率，但无法提升输入带宽。数字带宽交替并行采样能同时突破器件对带宽和采样率的限制，但各子带间的多种误差会降低采样性能，子带数增多会增加误差校准难度。在不过多增加子带数的前提下实现极高采样率，需将两种并行采样技术结合。因此，本项目将研究基于数字带宽交替采样和时间交替采样混合结构的40GSPS采样率、带宽10GHz的数据采集方法，研究内容包括：研究宽带信号调理及子带分解滤波器组设计方法；研究高速并行数字上变频及用于高精度重构信号的综合滤波器组设计方法；对子带间的各种误差校准进行研究；研究时间交替采样中通道失配误差校准算法。预期成果将推动宽带时域测试仪器的发展，促进以高速数据采集系统为核心相关领域的进步。

Ultra wide band data acquisition has important application in communication, radar and testing instruments. However, the system bandwidth and sampling rate are limited by amplifier and analog-digital converter. Therefore, breaking through the bandwidth and sampling rate has become an urgent problem to be solved. The time-interleaved parallel sample can improve the sampling rate, but can not improve the input bandwidth. Digital bandwidth interleaving parallel sampling can overcome the limitation of bandwidth and sampling rate at the same time, but a variety of errors between sub-bands will reduce the sampling performance. The increase of sub-band number will increase the difficulty of error calibration. It is necessary to combine two kinds of parallel sampling techniques to achieve high sampling rate on the premise of limited sub-band number. Therefore, this project researches 40GSPS data acquisition method which is based digital bandwidth interleaving and time interleaved sample mixed structure, and the bandwidth is 10GHz. The research contents include: Research on broadband signal conditioning and sub-band decomposition filter design method; high speed parallel digital up conversion and synthesis filter design method for high precision signal reconstruction; calibration method for various error between sub-bands; research calibration algorithm for channel mismatch error in time interleaved sample. The expected results will promote the development of broadband time domain testing instruments and promote the progress of the field related to high speed data acquisition.