CAJ | 학술논문

并行采集系统中,通道间时基延迟的不一致性严重降低了系统性能.通过对系统时基误差分量的分析,提出了一种基于自适应控制的非均匀信号重构方法.该方法不需要额外增加校准信号,能在误差估计的同时自动完成信号重构,实时性高;无需重构滤波器,降低了系统设计难度及成本.实验结果表明,经过约250次自适应迭代后,该重构算法能有效估计通道时基误差,具有迭代次数少、运算量小、能动态跟踪时基延迟变化的特点;重构后系统信噪比由原来的33 dB提高到48 dB,有效位数提高近2.5 bit,系统性能得到了大幅提高.
병행채집계통중,통도간시기연지적불일치성엄중강저료계통성능.통과대계통시기오차분량적분석,제출료일충기우자괄응공제적비균균신호중구방법.해방법불수요액외증가교준신호,능재오차고계적동시자동완성신호중구,실시성고;무수중구려파기,강저료계통설계난도급성본.실험결과표명,경과약250차자괄응질대후,해중구산법능유효고계통도시기오차,구유질대차수소、운산량소、능동태근종시기연지변화적특점;중구후계통신조비유원래적33 dB제고도48 dB,유효위수제고근2.5 bit,계통성능득도료대폭제고.
In parallel time-interleaved sampling systems, timing mismatch of this structure degrades the perform-ance of whole ADC system. In this paper, an adaptive signal reconstruction algorithm is proposed by analyzing the tim-ing mismatch between channels. This algorithm could estimate timing mismatch, and simultaneously reconstruct the sampling data automatically with no needing of extra calibrating signal and the restructuring filter, that simplifies the design and has high real-time. Computer simulation results demonstrate it could estimate the timing mismatch effi-ciently and dynamically track the change with less steps and computation.