公开(公告)号：USRE45343E1

公开(公告)日：2015-01-20

申请号：US13683139

申请日：2012-11-21

Applicant: Intersil Americas Inc.

Inventor： Sundar S. Kidambi

IPC: H03M1/06

CPC classification number: H03M1/06 ,  H03M1/0624 ,  H03M1/1028 ,  H03M1/1215 ,  H04B1/16

Abstract: Techniques for correcting component mismatches in an M-channel time-interleaved Analog to Digital Converter (ADC). In order to obtain an error measure for offset, gain or phase, errors, outputs from each ADC are either summed or averaged over No samples. Calling each of the sums or averages as Xk where k=1, 2, . . . , M, there are M such values as a result. A single value representing the mean of these M values, Xmean, is chosen as a reference value. The offset, gain and phase errors for the M different ADCs are then obtained from Xk−Xmean. The sign of each offset error, i.e., sign (Xk−Xmean), is then used to drive an adaptive algorithm whose output represents an offset correction value for the corresponding ADC. The offset, gain, and phase correction outputs from the adaptive algorithm is fed to an array of Digital-to-Analog converters (DACs) whose outputs are voltages or currents that directly or indirectly controls the offset, gain or phase setting of each individual ADC. Thus, there are M different offset, gain and phase error signals and M different adaptive algorithms operating in conjunction with M different DACs providing offset control signals to M different ADCs. In certain embodiments, spur frequencies can be reduced with the use of notch filters.

Abstract translation: 用于校正M通道时间交织模数转换器（ADC）中元件失配的技术。 为了获得偏移，增益或相位误差的误差，错误，每个ADC的输出在无样本之间求和或平均。 将每个或者平均值调用为X k，其中k = 1,2。 。 。 ，M，结果有这样的M值。 选择表示这些M值的平均值的单个值Xmean作为参考值。 然后从Xk-Xmean获得M个不同ADC的偏移，增益和相位误差。 然后使用每个偏移误差的符号，即符号（Xk-Xmean）来驱动自适应算法，其自适应算法的输出表示对应的ADC的偏移校正值。 来自自适应算法的偏移，增益和相位校正输出被馈送到数模转换器（DAC）阵列，数字模拟转换器（DAC）的输出是直接或间接控制每个ADC的偏移，增益或相位设置的电压或电流 。 因此，存在M个不同的偏移，增益和相位误差信号，以及M个不同的自适应算法，与M个不同的DAC结合，为M个不同的ADC提供偏移控制信号。 在某些实施例中，使用陷波滤波器可以减少杂散频率。