公开(公告)号：US10027447B2

公开(公告)日：2018-07-17

申请号：US15673064

申请日：2017-08-09

Applicant: Analog Devices, Inc.

Inventor： Gabriele Manganaro

IPC: H04B3/46 ,  H04L1/20 ,  G01R31/36 ,  G01R27/04 ,  H03M1/08 ,  H03M1/74

Abstract: Circuits are used to sense and compensate or mitigate the imbalance errors, hence restoring the intended benefits of differential processing. In particular, the impedance mismatch between the positive and negative branches of a balanced system is sensed by digitizing an error voltage developed by injecting suitable common mode stimuli. The mismatch is then trimmed out by introducing and properly setting up a digitally controlled impedance that counters the original impedance mismatch and hence rebalances the signal path on-situ and prior to exercising the signal processing chain.

公开(公告)号：US20150180501A1

公开(公告)日：2015-06-25

申请号：US14135198

申请日：2013-12-19

Applicant: Analog Devices, Inc.

Inventor： Matthew Louis Courcy ,  Martin Clara ,  Gabriele Manganaro ,  Gil Engel ,  Lawrence A. Singer

IPC: H03M1/74

CPC classification number: H03M1/747 ,  H03K17/162 ,  H03K17/693 ,  H03M1/068 ,  H03M1/66 ,  H03M1/742 ,  H03M1/745

Abstract: The present disclosure provides embodiments of an improved current steering switching element for use in a digital to analog (DAC) converter. Typically, each current steering switching element in the DAC converter provides a varying set of currents for converting a digital input signal. Generally, the switches and drivers in the current steering switching elements are scaled down proportionally to the current being provided by the current steering switching element according to a ratio as less and less current is being driven by the switching element in order to overcome timing errors. However, device sizes are limited by the production process. When a switch is not scaled proportionally to the current, settling timing errors are present and affects the performance of the DAC. The improved current steering switching element alleviates this issue of timing errors by replacing the single switch with two complementary current steering switches.

Abstract translation: 本公开提供了用于在数模转换器（DAC）中使用的改进的电流转向开关元件的实施例。 通常，DAC转换器中的每个电流转向开关元件提供用于转换数字输入信号的变化的电流组。 通常，当前转向开关元件中的开关和驱动器按照由当前转向开关元件提供的电流按比例按比例缩小，因为越来越少的电流被开关元件驱动以克服定时误差。 但是，设备尺寸受到生产过程的限制。 当开关未按比例与当前的比例缩放时，存在稳定的定时误差并影响DAC的性能。 改进的电流转向开关元件通过用两个互补电流转向开关替换单个开关来减轻定时误差的这个问题。

公开(公告)号：US09531398B2

公开(公告)日：2016-12-27

申请号：US15042675

申请日：2016-02-12

Applicant: ANALOG DEVICES. INC.

Inventor： Paul F. Ferguson ,  Gabriele Manganaro

IPC: H03M1/06 ,  G01R31/28 ,  H03M1/12

CPC classification number: H03M1/06 ,  G01R31/2642 ,  G01R31/2872 ,  H03M1/12

Abstract: Aging effects on devices fabricated using deep nanometer complementary metal-oxide semiconductor (CMOS) processes can cause circuits to exhibit an undesirable mismatch buildup over time. To address the aging effects, the connections to an array of M differential circuits are controlled to limit and systematically minimize or reverse the aging effects. In one embodiment, the controlling permutation sequence is selected to stress the array of M differential circuits under opposite stress conditions during at least two different time periods. Imposing opposite stress conditions, preferably substantially equal opposite stress conditions, can reverse the direction of a mismatch buildup and limit the mismatch buildup over time within acceptable limits. The controlling permutation sequence can be applied to an array of comparators of an analog-to-digital converter, or an array of differential amplifiers of a folding analog-to-digital converter.

Abstract translation: 使用深纳米互补金属氧化物半导体（CMOS）工艺制造的器件的老化效应可能导致电路随时间呈现出不期望的不匹配积累。 为了解决老化的影响，控制到一组M个差分电路的连接，以限制和系统地最小化或逆转老化效应。 在一个实施例中，选择控制置换序列以在至少两个不同时间段期间在相反的应力条件下对M个差分电路的阵列施加应力。 施加相反的应力条件，优选地基本上相等的相对应力条件可以反转不匹配积累的方向，并且在可接受的限度内限制不匹配的积累。 控制置换序列可以应用于模数转换器的比较器阵列，或折叠模数转换器的差分放大器阵列。

公开(公告)号：US09584151B1

公开(公告)日：2017-02-28

申请号：US15058008

申请日：2016-03-01

Applicant: ANALOG DEVICES, INC.

Inventor： Gabriele Manganaro ,  Gil Engel

IPC: H03M1/66

CPC classification number: H03M1/0863 ,  H03M1/0673 ,  H03M1/0678 ,  H03M1/742

Abstract: Reducing distortions in a digital-to-analog converter is a challenge for circuit designers. For current steering digital-to-analog converters (DACs), a quad switching scheme has been used to remove code-dependent glitching which is otherwise present in dual switching schemes. However, due to various impairments in the circuit, e.g., mismatches in the transistors, some code-dependent distortions remain even when a quad switching scheme is implemented. To address this issue, the quad switching scheme can be randomized to improve dynamic linearity while relaxing driving circuitry design and power constraints. Advantageously, randomization reduces the code dependency of the distortions and makes the distortions appear more noise-like at the output of the DAC.

Abstract translation: 降低数模转换器的失真是电路设计人员面临的挑战。 对于当前的转向数模转换器（DAC），四路交换方案已被用于消除以双重切换方案存在的代码相关的毛刺。 然而，由于电路中的各种损伤，例如晶体管中的失配，即使实现四通道交换方案，仍然保留一些代码相关的失真。 为了解决这个问题，四方切换方案可以被随机化以改善动态线性度，同时放松驱动电路设计和功率限制。 有利的是，随机化降低了失真的代码依赖性，并且使得在DAC的输出处出现类似于失真的失真。

公开(公告)号：US09118346B2

公开(公告)日：2015-08-25

申请号：US14135198

申请日：2013-12-19

Applicant: ANALOG DEVICES, INC.

Inventor： Matthew Louis Courcy ,  Martin Clara ,  Gabriele Manganaro ,  Gil Engel ,  Lawrence A. Singer

IPC: H03M1/66 ,  H03M1/74

CPC classification number: H03M1/747 ,  H03K17/162 ,  H03K17/693 ,  H03M1/068 ,  H03M1/66 ,  H03M1/742 ,  H03M1/745

Abstract: The present disclosure provides embodiments of an improved current steering switching element for use in a digital to analog (DAC) converter. Typically, each current steering switching element in the DAC converter provides a varying set of currents for converting a digital input signal. Generally, the switches and drivers in the current steering switching elements are scaled down proportionally to the current being provided by the current steering switching element according to a ratio as less and less current is being driven by the switching element in order to overcome timing errors. However, device sizes are limited by the production process. When a switch is not scaled proportionally to the current, settling timing errors are present and affects the performance of the DAC. The improved current steering switching element alleviates this issue of timing errors by replacing the single switch with two complementary current steering switches.

Abstract translation: 本公开提供了用于在数模转换器（DAC）中使用的改进的电流转向开关元件的实施例。 通常，DAC转换器中的每个电流转向开关元件提供用于转换数字输入信号的变化的电流组。 通常，当前转向开关元件中的开关和驱动器按照由当前转向开关元件提供的电流按比例按比例缩小，因为越来越少的电流被开关元件驱动以克服定时误差。 但是，设备尺寸受到生产过程的限制。 当开关未按比例与当前的比例缩放时，存在稳定的定时误差并影响DAC的性能。 改进的电流转向开关元件通过用两个互补电流转向开关替换单个开关来减轻定时误差的这个问题。