公开(公告)号：US20150288380A1

公开(公告)日：2015-10-08

申请号：US14302173

申请日：2014-06-11

Applicant: ANALOG DEVICES TECHNOLOGY

Inventor： JIALIN ZHAO ,  RICHARD E. SCHREIER ,  JOSE BARREIRO SILVA ,  HAJIME SHIBATA ,  WENHUA W. YANG ,  YUNZHI DONG

IPC: H03M3/00

CPC classification number: H03M3/378 ,  H03M1/1019 ,  H03M1/1038 ,  H03M1/74 ,  H03M3/37 ,  H03M3/384 ,  H03M3/388 ,  H03M3/464

Abstract: Digital-to-analog converters (DACs) are used widely in electronics. The DACs are usually not ideal and typically exhibits errors, e.g., static mismatch errors. This disclosure describes a digital calibration technique for DAC static mismatch in continuous-time delta-sigma modulators (CTDSMs). The methodology utilizes the DAC unit elements (UEs) themselves to measure each other's mismatch. There are no extra circuitries except for the logic design inside DAC drivers or comparators. The methodology is an attractive calibration technique for high performance CTDSMs, especially for high speed system in multi-gigahertz range with low over-sampling rate (OSR).

Abstract translation: 数模转换器（DAC）广泛应用于电子产品。 DAC通常不理想，并且通常表现出错误，例如静态失配错误。 本公开描述了用于连续时间Δ-Σ调制器（CTDSM）中的DAC静态失配的数字校准技术。 该方法利用DAC单元元件（UE）本身来测量彼此的不匹配。 没有额外的电路，除了DAC驱动器或比较器中的逻辑设计。 该方法是高性能CTDSM的有吸引力的校准技术，特别是对于具有低过采样率（OSR）的多千兆赫兹范围内的高速系统。

公开(公告)号：US20160072275A1

公开(公告)日：2016-03-10

申请号：US14477236

申请日：2014-09-04

Applicant: ANALOG DEVICES TECHNOLOGY

Inventor： TREVOR CLIFFORD CALDWELL ,  COREY PETERSEN ,  DAVID NELSON ALLDRED ,  HAJIME SHIBATA

IPC: H02H7/12 ,  H03M3/00

CPC classification number: H02H7/12 ,  H03M3/30 ,  H03M3/36 ,  H03M3/464 ,  H03M3/484

Abstract: Delta-sigma modulators do not handle overload well, and often become unstable if the input goes beyond the full-scale range of the modulator. To provide overload protection, an improved technique embeds an overload detector in the delta sigma modulator. When an overload condition is detected, coefficient(s) of the delta sigma modulator is adjusted to accommodate for the overloaded input. The improved technique advantageously allows the delta sigma modulator to handle overload gracefully without reset, and offers greater dynamic range at reduced resolution. Furthermore, the coefficient(s) of the delta sigma modulator can be adjusted in such a way to ensure the noise transfer function is not affected.

Abstract translation: Δ-Σ调制器不能很好地处理过载，如果输入超出调制器的满量程范围，通常会变得不稳定。 为了提供过载保护，改进的技术将过载检测器嵌入到Δ-Σ调制器中。 当检测到过载条件时，调节ΔΣ调制器的系数以适应过载输入。 改进的技术有利地允许Δ-Σ调制器在没有复位的情况下优雅地处理过载，并且以降低的分辨率提供更大的动态范围。 此外，可以以这样的方式调整Δ-Σ调制器的系数，以确保噪声传递函数不受影响。