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    DIGITAL-TO-ANALOG CONVERTERS WITH TRIODE SWITCHES
    2.
    发明公开
    DIGITAL-TO-ANALOG CONVERTERS WITH TRIODE SWITCHES 审中-公开

    公开(公告)号：US20240113727A1

    公开(公告)日：2024-04-04

    申请号：US18324035

    申请日：2023-05-25

    Applicant: MediaTek Inc.

    Inventor： Nathan Egan

    IPC: H03M1/80 ,  H03M1/74

    CPC classification number: H03M1/808 ,  H03M1/745

    Abstract: Current steering digital-to-analog converters (DACs) are described. These DACs are suitable for high speed operation. Weight transistors conventionally used in DACs are replaced with resistors, resulting in a lower RC constant. Further, the resistors cause a smaller voltage drop, thus improving the voltage headroom of the DAC. Additionally, the current steering switches are biased in the triode region, as opposed to the saturation region as in conventional designs. Biasing the switches in the triode region results in a smaller drain-source voltage, which further improves the voltage headroom of the DAC. The triode operation further results in a substantially smaller output impedance, which leads to the output voltage being dictated primarily by the output transistor of the current path. Lastly, reset switches are added which reduce data-dependent memory effects that can otherwise produce distortion.

    SYSTEM AND METHOD FOR MEASURING THE DC-TRANSFER CHARACTERISTIC OF AN ANALOG-TO-DIGITAL CONVERTER
    4.
    发明申请
    SYSTEM AND METHOD FOR MEASURING THE DC-TRANSFER CHARACTERISTIC OF AN ANALOG-TO-DIGITAL CONVERTER 有权
    用于测量模拟数字转换器的直流转换特性的系统和方法

    公开(公告)号：US20160211861A1

    公开(公告)日：2016-07-21

    申请号：US14886545

    申请日：2015-10-19

    Applicant: MediaTek Inc.

    Inventor： Frank Op 't Eynde ,  Nathan Egan ,  Khurram Muhammad ,  Tien-Yu Lo ,  Chi-Lun Lo ,  Michael A. Ashburn

    IPC: H03M3/00

    CPC classification number: H03M1/109 ,  H03M1/1038 ,  H03M1/12 ,  H03M3/50

    Abstract: Systems and methods for measuring and compensating a DC-transfer characteristic of analog-to-digital converters are described. A test-signal generator comprising a sigma-delta modulator may provide calibration signals to an ADC. An output from the ADC may be filtered with a notch filter to suppress quantization noise at discrete frequencies introduced by the sigma-delta modulator. The resulting filtered signal may be compared against an input digital signal to the test-signal generator to determine a transfer characteristic of the ADC.

    Abstract translation: 描述了用于测量和补偿模数转换器的直流传递特性的系统和方法。 包括Σ-Δ调制器的测试信号发生器可以向ADC提供校准信号。 来自ADC的输出可以用陷波滤波器滤波，以抑制由Σ-Δ调制器引入的离散频率的量化噪声。 所得到的滤波信号可以与输入的数字信号与测试信号发生器进行比较，以确定ADC的传输特性。

    System and method for measuring the DC-transfer characteristic of an analog-to-digital converter
    5.
    发明授权
    System and method for measuring the DC-transfer characteristic of an analog-to-digital converter 有权
    用于测量模数转换器的直流传递特性的系统和方法

    公开(公告)号：US09584146B2

    公开(公告)日：2017-02-28

    申请号：US14886545

    申请日：2015-10-19

    Applicant: MediaTek Inc.

    Inventor： Frank Op 't Eynde ,  Nathan Egan ,  Khurram Muhammad ,  Tien-Yu Lo ,  Chi-Lun Lo ,  Michael A. Ashburn

    IPC: H03M1/10 ,  H03M1/12 ,  H03M3/00

    CPC classification number: H03M1/109 ,  H03M1/1038 ,  H03M1/12 ,  H03M3/50

    Abstract: Systems and methods for measuring and compensating a DC-transfer characteristic of analog-to-digital converters are described. A test-signal generator comprising a sigma-delta modulator may provide calibration signals to an ADC. An output from the ADC may be filtered with a notch filter to suppress quantization noise at discrete frequencies introduced by the sigma-delta modulator. The resulting filtered signal may be compared against an input digital signal to the test-signal generator to determine a transfer characteristic of the ADC.

    Abstract translation: 描述了用于测量和补偿模数转换器的直流传递特性的系统和方法。 包括Σ-Δ调制器的测试信号发生器可以向ADC提供校准信号。 来自ADC的输出可以用陷波滤波器滤波，以抑制由Σ-Δ调制器引入的离散频率的量化噪声。 所得到的滤波信号可以与输入的数字信号与测试信号发生器进行比较，以确定ADC的传输特性。

    VCO-BASED CONTINUOUS-TIME SIGMA DELTA MODULATOR EQUIPPED WITH TRUNCATION CIRCUIT AND PHASE-DOMAIN EXCESS LOOP DELAY COMPENSATION
    6.
    发明申请
    VCO-BASED CONTINUOUS-TIME SIGMA DELTA MODULATOR EQUIPPED WITH TRUNCATION CIRCUIT AND PHASE-DOMAIN EXCESS LOOP DELAY COMPENSATION 有权
    基于VCO的连续时间SIGMA DELTA调制器配有TRUNCATION CIRCUIT和相域超越循环延迟补偿

    公开(公告)号：US20160365870A1

    公开(公告)日：2016-12-15

    申请号：US15069951

    申请日：2016-03-14

    Applicant: MEDIATEK INC.

    Inventor： Sheng-Jui Huang ,  Michael A. Ashburn, JR. ,  Divya Kesharwani ,  Nathan Egan

    IPC: H03M3/00

    CPC classification number: H03M3/37 ,  H03M1/86 ,  H03M3/422 ,  H03M3/424 ,  H03M3/428 ,  H03M3/464

    Abstract: A continuous-time sigma-delta modulator includes a VCO-based quantizer, a rotator, a truncation circuit and a digital-to-analog converter (DAC). The VCO-based quantizer is arranged to generate a thermometer code based on an input signal and a feedback signal. The rotator is coupled to the VCO-based quantizer, and is arranged to generate a phase-shifted thermometer code based on the thermometer code and a phase shift, and generate a rearranged thermometer code based on the phase-shifted thermometer code to comply with a specific pattern. The truncation circuit is coupled to the rotator, and is arranged to extract a most significant bit (MSB) part from the rearranged thermometer code. The DAC is coupled to the truncation circuit, and is arranged to generate the feedback signal according to at least the MSB part. Two alternative continuous-time sigma-delta modulators are also disclosed.

    Abstract translation: 连续时间Σ-Δ调制器包括基于VCO的量化器，旋转器，截断电路和数模转换器（DAC）。 基于VCO的量化器被布置成基于输入信号和反馈信号生成温度计代码。 旋转器耦合到基于VCO的量化器，并且被布置成基于温度计代码和相移生成相移温度计代码，并且基于相移温度计代码生成重新排列的温度计代码以符合 具体模式。 截断电路耦合到旋转器，并且被布置成从重新排列的温度计代码中提取最高有效位（MSB）部分。 DAC耦合到截断电路，并且被布置成根据至少MSB部分产生反馈信号。 还公开了两种替代的连续时间Σ-Δ调制器。

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