宽带取样示波器时基误差补偿的新方法研究

Research on New Method of Time Base Error Compensation for Broadband Sampling Oscilloscope

时基误差严重影响宽带取样示波器的高精准测量,但对时基误差进行精确估计和补偿极为困难。针对宽带取样示波器的时基误差(含时基失真与抖动引起的误差),首次运用正交距离回归算法对宽带取样示波器时基误差进行估计。对比多相位、多频率最小二乘法,该方法仅用一组近似正交的正弦信号对宽带取样示波器的时基误差进行有效估计,实现了对测量信号的时基补偿,得出了低于0.3 ps的时基误差,显著提高了宽带取样示波器测量准确度。

Time-based errors seriously affect the accurate measurement of broadband sampling oscilloscopes,but it is extremely difficult to accurately estimate and compensate for time-base errors.For the time-base error of broadband sampling oscilloscope(including time-base distortion and jitter-induced error),the orthogonal time-regression algorithm is used to estimate the time-base error of oscilloscope for the first time.Compared with the multi-phase and multi-frequency least squares method,only to uses a set of approximately orthogonal sinusoidal signals to effectively estimate the time base error of the broadband sampling oscilloscope,and realizes the time base compensation of the measured signals.A time base error of less than 0.3 ps is obtained,which significantly improves the measurement accuracy of the broadband sampling oscilloscope.