现代电子技术
現代電子技術
현대전자기술
MODERN ELECTRONICS TECHNIQUE
2013年
15期
65-68,72
,共5页
范涛%马仑%徐德正
範濤%馬崙%徐德正
범도%마륜%서덕정
模数转换器%多通道采样%增益失配%协方差矩阵
模數轉換器%多通道採樣%增益失配%協方差矩陣
모수전환기%다통도채양%증익실배%협방차구진
analog-to-digital converter%multichannel sampling%gain mismatch%covariance matrix
多通道采样系统可以有效解决单片模数转换器 ADC 转换速率与量化精度的矛盾，从而能够在提高采样率的同时保证采样高精度。但是多通道间的失配误差将严重降低系统性能，早期的研究主要集中于时间误差（静态抖动）的估计，增益失配是由于制造过程中各数模转换器的工艺流程不同引起的。与时基误差类似，增益失配同样将导致采样信号的非线性失真。提出了一种利用接收数据矢量的二阶统计特性来估计增益失配误差的方法，该方法计算量小，易于实现。仿真数据的处理结果验证了该方法的有效性。
多通道採樣繫統可以有效解決單片模數轉換器 ADC 轉換速率與量化精度的矛盾，從而能夠在提高採樣率的同時保證採樣高精度。但是多通道間的失配誤差將嚴重降低繫統性能，早期的研究主要集中于時間誤差（靜態抖動）的估計，增益失配是由于製造過程中各數模轉換器的工藝流程不同引起的。與時基誤差類似，增益失配同樣將導緻採樣信號的非線性失真。提齣瞭一種利用接收數據矢量的二階統計特性來估計增益失配誤差的方法，該方法計算量小，易于實現。倣真數據的處理結果驗證瞭該方法的有效性。
다통도채양계통가이유효해결단편모수전환기 ADC 전환속솔여양화정도적모순，종이능구재제고채양솔적동시보증채양고정도。단시다통도간적실배오차장엄중강저계통성능，조기적연구주요집중우시간오차（정태두동）적고계，증익실배시유우제조과정중각수모전환기적공예류정불동인기적。여시기오차유사，증익실배동양장도치채양신호적비선성실진。제출료일충이용접수수거시량적이계통계특성래고계증익실배오차적방법，해방법계산량소，역우실현。방진수거적처리결과험증료해방법적유효성。
The multichannel sampling system can solve the contradiction between the conversion rate and quantitative preci?sion of analog?to?digital converter(ADC),thereby the high sampling precision can be ensured while the sampling rate is raised. However, the mismatch error among channels will seriously degrade the performance of system. The early research mainly focused on the time error(static jitter)estimation. The gain mismatch is caused by the different technological process of each DA convertor during the manufacturing process. Similar to the time base error,the gain mismatch can also lead to non?linear distortion of sampled signal. A method is proposed to estimate the gain mismatch error by using the second order statistical property of received data vector. The method needs less calculations and is easy to realize. The processing result of the simulation data proved the effectiveness of the method.
