公开(公告)号：US20170170839A1

公开(公告)日：2017-06-15

申请号：US15360349

申请日：2016-11-23

申请人： ANALOG DEVICES, INC.

发明人： Jialin Zhao ,  Qingdong Meng ,  Yunzhi Dong ,  Jose Barreiro Silva

IPC分类号： H03M1/10 ,  H03M3/00 ,  H03M1/46

CPC分类号： H03M1/1071 ,  H03M1/1038 ,  H03M1/16 ,  H03M1/38 ,  H03M1/46 ,  H03M3/412 ,  H03M3/464

摘要： For analog-to-digital converters (ADCs) which utilize a feedback digital-to-analog converter (DAC) for conversion, the final analog output can be affected or distorted by errors of the feedback DAC. A digital measurement technique can be implemented to determine timing mismatch error for the feedback DAC in a continuous-time delta-sigma modulator (CTDSM) or in a continuous-time pipeline modulator. The methodology utilizes cross-correlation of each DAC unit elements (UEs) output to the entire modulator output to measure its timing mismatch error respectively. Specifically, the timing mismatch error is estimated using a ratio based on a peak value and a value for the next tap in the cross-correlation function. The obtained errors can be stored in a look-up table and fully corrected in digital domain or analog domain.

公开(公告)号：US09735797B2

公开(公告)日：2017-08-15

申请号：US15360349

申请日：2016-11-23

申请人： ANALOG DEVICES, INC.

发明人： Jialin Zhao ,  Qingdong Meng ,  Yunzhi Dong ,  Jose Barreiro Silva

IPC分类号： H03M1/00 ,  H03M1/10 ,  H03M1/46 ,  H03M3/00

CPC分类号： H03M1/1071 ,  H03M1/1038 ,  H03M1/16 ,  H03M1/38 ,  H03M1/46 ,  H03M3/412 ,  H03M3/464

摘要： For analog-to-digital converters (ADCs) which utilize a feedback digital-to-analog converter (DAC) for conversion, the final analog output can be affected or distorted by errors of the feedback DAC. A digital measurement technique can be implemented to determine timing mismatch error for the feedback DAC in a continuous-time delta-sigma modulator (CTDSM) or in a continuous-time pipeline modulator. The methodology utilizes cross-correlation of each DAC unit elements (UEs) output to the entire modulator output to measure its timing mismatch error respectively. Specifically, the timing mismatch error is estimated using a ratio based on a peak value and a value for the next tap in the cross-correlation function. The obtained errors can be stored in a look-up table and fully corrected in digital domain or analog domain.