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�������պ����ѧѧ�� 2010, Vol. 36 Issue (10) :1203-1206    DOI:
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Novel evaluation method of time base distortion of nonuniformly sampling data acquisition systems
Liang Zhiguo, Meng Xiaofeng*
School of Instrument Science and Opto-electronics Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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Abstract�� By using both the time base differential non-linearity and integral non-linearity,a novel method to evaluate the time base distortion is presented, which deal with the nonuniformly sampling data acquisition systems. By using sinusoidal stimulating, and then re-sampling the data to create sub-series of each sub-A/D converter, through curve-fit results of sub-series sinusoidal waveforms, the phase difference between two sub-series was obtained. The time difference corresponding the phase difference is the sampling time delay between two sub-A/D. Their consistency is the time base distortion of nonuniformly sampling systems, which can be expressed in time base difference non-linearity and time base integral non-linearity. In simulation test, the correctness of the method was validated. In practical experiment on a digital storage oscilloscope, the feasibility of the method was proved. The method above can be use to evaluate the time base distortion of nonuniformly sampling data acquisition systems.
Keywords�� time base   distortion   nonuniformly sampling   curve-fit   calibration   evaluation     
Received 2009-09-14; published 2010-11-12
About author: ��־��(1962-),��,������������,��ʿ��,lzg304@sina.com.
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��־��, ������.�Ǿ��Ȳ���ϵͳʱ��ʧ���һ�������۷���[J]  �������պ����ѧѧ��, 2010,V36(10): 1203-1206
Liang Zhiguo, Meng Xiaofeng.Novel evaluation method of time base distortion of nonuniformly sampling data acquisition systems[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2010,V36(10): 1203-1206
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