一种时间交替ADC时间失配误差自适应校正方法
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摘要
时间失配误差是时间交替并行采集系统的失配误差中最主要且影响最大的误差。针对该问题,提出了一种基于Farrow结构分数延迟滤波器结合自适应估计对时间失配误差进行数字校正的方法。分数延迟滤波器可以在有限带宽信号采样点之间进行插值。该方法可以对奈奎斯特频率以内的输入信号进行补偿校正,同时适用于任意通道数的时间交替ADC。仿真结果表明,该方法能够对时间失配误差进行精确估计,同时能够有效地抑制杂散分量,校正效果良好。最后,在实际的时间交替采集系统中验证了该方法的有效性。
Timing-mismatch error is the most important error and has great influence in the mismatch errors of timeinterleaved parallel acquisition systems,which can greatly degrade the dynamic range of time-interleaved analog-todigital converters( TIADCs). In this paper,a novel digital calibration method for the inter-channel timing-mismatch error is proposed,which is based on Farrow structure fractional delay filter combined with adaptive estimation technique. For the purpose of online correction,the timing mismatch errors are obtained adaptively. The mismatch errors are corrected with the fractional delay filter developed in the form of Farrow structure. The proposed method could calibrate the band-limited signals in the first Nyquist zone,and could be used in the TIADC with any number of channels. The simulation experiment results show that the proposed method can estimate the timing-mismatch error accurately,effectively restrain the spurious spurs and has good calibration effect. The effectiveness of the proposed method was verified in an actual time-interleaved acquisition system.
Timing-mismatch error is the most important error and has great influence in the mismatch errors of timeinterleaved parallel acquisition systems,which can greatly degrade the dynamic range of time-interleaved analog-todigital converters( TIADCs). In this paper,a novel digital calibration method for the inter-channel timing-mismatch error is proposed,which is based on Farrow structure fractional delay filter combined with adaptive estimation technique. For the purpose of online correction,the timing mismatch errors are obtained adaptively. The mismatch errors are corrected with the fractional delay filter developed in the form of Farrow structure. The proposed method could calibrate the band-limited signals in the first Nyquist zone,and could be used in the TIADC with any number of channels. The simulation experiment results show that the proposed method can estimate the timing-mismatch error accurately,effectively restrain the spurious spurs and has good calibration effect. The effectiveness of the proposed method was verified in an actual time-interleaved acquisition system.
引文
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[3]朱子翰,吕幼新.时间交替采样系统的误差测量与FPGA实现[J].电子测量技术,2011,34(3):54-56.ZHU Z H,LV Y X.Measurement and calibration of mismatched errors in multi-chip ADC time-interleaved systems[J].Electronic measurement technology,2011,34(3):54-56.
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[13]叶芃,曾浩,潘卉青,等.10 Gsps数字三维示波器关键技术研究[J].仪器仪表学报,2012,33(12):2688-2696.YE P,ZENG H,PAN H Q,et al.Research on key technology of 10 Gsps digital three-dimensional oscilloscope[J].Chinese Journal of Scientific Instrument,2012,33(12):2688-2696.
[14]ZOU Y X,ZHANG S L,LIM Y C,et al.Timing mismatch compensation in time-interleaved ADCs based on multichannel Lagrange polynomial interpolation[J].IEEE Transactions on Instrumentation and Measurement,2011,60(4):1123-1131.
[15]LAW C H,HURST P J,LEWIS S H.A four-channel timeinterleaved ADC with digital calibration of interchannel timing and memory errors[J].IEEE Journal of Solid-State Circuits,2010,45(10):2091-2103.
[16]FARROW C W.A continuously variable digital delay element[C].IEEE International Symposium on Circuits and Systems,IEEE,1988:2641-2645.
[17]刘艳茹,田书林,王志刚,等.一种基于Farrow滤波器的并行采样时间误差校正[J].电子测量与仪器学报,2010,24(1):50-54.LIU Y R,TIAN SH L,WANG ZH G,et al.A sample-timing error calibration for time-interleaved ADC based on farrow filter[J].Journal of Electronic Measurement and Instrument,2010,24(1):50-54.
[18]田书林,潘卉青,王志刚.一种并行采样中的自适应非均匀综合校准方法[J].电子学报,2009,37(10):2298-2301.TIAN SH L,PAN H Q,WANG ZH G.An adaptive synthesis calibration method for time delay of sampling systems[J].Acta Electronica Sinica,2009,37(10):2298-2301.
[2]KUROSAWA N,KOBAYASHI A,MARUYAMA K,et al.Explicit analysis of channel mismatch effects in time-interleaved ADC systems[J].IEEE Transactions on Circuits and System I:Fundamental Theory and Applications,2001,48(3):261-271.
[3]朱子翰,吕幼新.时间交替采样系统的误差测量与FPGA实现[J].电子测量技术,2011,34(3):54-56.ZHU Z H,LV Y X.Measurement and calibration of mismatched errors in multi-chip ADC time-interleaved systems[J].Electronic measurement technology,2011,34(3):54-56.
[4]MANAR E C,BORIS M.Background calibration of timeinterleaved data converters[M].Springer Science+Business Media,2012.
[5]VOGEL C.The impact of combined channel mismatch effects in time-interleaved ADCs[J].IEEE Transactions on Instrumentation and Measurement,2005,54(1):415-427.
[6]ZHANG P,YE F,YU B,et al.Mixed-signal calibration of sample-time error in time-interleaved ADCs[J].Electronics Letters,2011,47(9):533-535.
[7]LIU W,CHIU Y.Time-interleaved analog-to-digital conversion with online adaptive equalization[J].IEEE Transactions on Circuits and Systems I:Regular Papers,2012,59(7):1384-1395.
[8]MATSUNO J,YAMAJI T,FURUTA M,et al.All-digital background calibration technique for time-interleaved ADC using pseudo aliasing signal[C].IEEE International Symposium on Circuits and System(ISCAS),IEEE,2012:1050-1053.
[9]张昊,师奕兵,王志刚.时间交替ADC通道失配误差的LS法估计[J].仪器仪表学报,2010,31(5):1161-1166.ZHANG H,SHI Y B,WANG ZH G.Calculation of channel mismatch error in time-interleaved ADC system using least-squares method[J].Chinese Journal of Scientific Instrumentation,2010,31(5):1161-1166.
[10]潘卉青,田书林,曾浩,等.一种并行系统时基误差自适应估计方法[J].仪器仪表学报,2009,30(11):2268-2272.PAN H Q,TIAN SH L,ZENG H,et al.Adaptive evaluation method for time-base mismatch of sampling systems[J].Chinese Journal of Scientific Instrumentation,2009,30(11):2268-2272.
[11]潘卉青,田书林,叶芃,等.一种并行交替采样中时基非均匀信号自适应重构方法[J].电子测量与仪器学报,2010,24(1):34-38.PAN H Q,TIAN SH L,YE P,et al.Adaptive signal reconstruction for timing nonuniform of parallel sampling systems[J].Journal of Electronic Measurement and Instrument,2010,24(1):34-38.
[12]张昊,师奕兵,王志刚.时间交替ADC系统通道时钟延迟的多频正弦拟合算法[J].电子测量与仪器学报,2010,24(3):244-249.ZHANG H,SHI Y B,WANG ZH G.Multi-tone sine wave fit algorithm of channel time delay in time-interleaved ADC system[J].Journal of electronic measurement and instrument,2010,24(3):244-249.
[13]叶芃,曾浩,潘卉青,等.10 Gsps数字三维示波器关键技术研究[J].仪器仪表学报,2012,33(12):2688-2696.YE P,ZENG H,PAN H Q,et al.Research on key technology of 10 Gsps digital three-dimensional oscilloscope[J].Chinese Journal of Scientific Instrument,2012,33(12):2688-2696.
[14]ZOU Y X,ZHANG S L,LIM Y C,et al.Timing mismatch compensation in time-interleaved ADCs based on multichannel Lagrange polynomial interpolation[J].IEEE Transactions on Instrumentation and Measurement,2011,60(4):1123-1131.
[15]LAW C H,HURST P J,LEWIS S H.A four-channel timeinterleaved ADC with digital calibration of interchannel timing and memory errors[J].IEEE Journal of Solid-State Circuits,2010,45(10):2091-2103.
[16]FARROW C W.A continuously variable digital delay element[C].IEEE International Symposium on Circuits and Systems,IEEE,1988:2641-2645.
[17]刘艳茹,田书林,王志刚,等.一种基于Farrow滤波器的并行采样时间误差校正[J].电子测量与仪器学报,2010,24(1):50-54.LIU Y R,TIAN SH L,WANG ZH G,et al.A sample-timing error calibration for time-interleaved ADC based on farrow filter[J].Journal of Electronic Measurement and Instrument,2010,24(1):50-54.
[18]田书林,潘卉青,王志刚.一种并行采样中的自适应非均匀综合校准方法[J].电子学报,2009,37(10):2298-2301.TIAN SH L,PAN H Q,WANG ZH G.An adaptive synthesis calibration method for time delay of sampling systems[J].Acta Electronica Sinica,2009,37(10):2298-2301.