公开(公告)号：US09350373B1

公开(公告)日：2016-05-24

申请号：US14741841

申请日：2015-06-17

Applicant: MediaTek Inc.

Inventor： Tsung-Kai Kao

IPC: H03M3/00 ,  H03M1/08 ,  H03M1/12

CPC classification number: H03M1/0854 ,  H03M1/12 ,  H03M3/352 ,  H03M3/42 ,  H03M3/45 ,  H03M3/458

Abstract: An analog-to-digital conversion that converts an input signal to an output signal by using multiple analog-to-digital converting circuits. A first analog-to-digital converting circuit generates a first signal based on the input signal and further outputs a feature signal of a first quantization error of the first analog-to-digital converting circuit. A second analog-to-digital converting circuit generates a second signal based on the input signal and the feature signal. The output combiner combines the first signal and the second signal to generate the output signal and thereby to reduce a quantization error factor in the output signal that is due to the first quantization error.

Abstract translation: 通过使用多个模数转换电路将输入信号转换为输出信号的模数转换。 第一模数转换电路基于输入信号产生第一信号，并且还输出第一模数转换电路的第一量化误差的特征信号。 第二模拟 - 数字转换电路基于输入信号和特征信号产生第二信号。 输出组合器组合第一信号和第二信号以产生输出信号，从而减少由于第一量化误差而导致的输出信号中的量化误差因子。

公开(公告)号：US20170077936A1

公开(公告)日：2017-03-16

申请号：US15259292

申请日：2016-09-08

Applicant: MediaTek Inc.

Inventor： Tsung-Kai Kao

IPC: H03M1/06 ,  H03M3/00 ,  H03M1/66

CPC classification number: H03M1/06 ,  H03M1/0863 ,  H03M1/66 ,  H03M1/742 ,  H03M3/50

Abstract: Apparatus and methods for reducing noise and distortion in current digital-to-analog converters (IDACs) are described. Compensating capacitors may be connected to current sources in an IDAC. The compensating capacitors may be driven with signals derived from the output of the IDAC to cancel transient current spikes that would otherwise occur on the output of the IDAC.

Abstract translation: 描述了用于减少当前数模转换器（IDAC）中的噪声和失真的装置和方法。 补偿电容器可以连接到IDAC中的电流源。 可以利用从IDAC的输出导出的信号来驱动补偿电容器，以消除否则将在IDAC的输出端发生的瞬态电流尖峰。

公开(公告)号：US20150131811A1

公开(公告)日：2015-05-14

申请号：US14601253

申请日：2015-01-21

Applicant: MEDIATEK INC.

Inventor： Tsung-Kai Kao ,  Pao-Cheng Chiu ,  Chien-Ming Chen

IPC: H03G3/34

CPC classification number: H03G3/348

Abstract: A signal output device includes: a control circuit for receiving at least a first input control signal and outputting an output control signal according to at least the first input control signal, wherein the first input control signal has a first signal segment followed by a second signal segment, and a voltage level of the first signal segment is unknown; and a driver circuit, operated according to a supply power, for receiving the output control signal from the control circuit; wherein a voltage of the supply power is settle before the second signal segment of the first input control signal is received by the control circuit; when the supply power is turned on, the driver circuit operates under a specific power state; and when the second signal segment of the first input control signal is received by the control circuit, the driver circuit keeps operating under the specific power state.

Abstract translation: 信号输出装置包括：控制电路，用于至少接收第一输入控制信号并根据至少第一输入控制信号输出输出控制信号，其中第一输入控制信号具有第一信号段和第二信号 段，第一信号段的电压电平未知; 以及驱动器电路，其根据供电功率进行操作，用于从所述控制电路接收所述输出控制信号; 其中在所述控制电路接收到所述第一输入控制信号的所述第二信号段之前，所述供电电压被稳定; 当电源接通时，驱动电路在特定功率状态下工作; 并且当控制电路接收到第一输入控制信号的第二信号段时，驱动电路在特定功率状态下保持运行。

公开(公告)号：US10483947B2

公开(公告)日：2019-11-19

申请号：US16157165

申请日：2018-10-11

Applicant: MEDIATEK Inc.

Inventor： Tien-Yu Lo ,  Chan-Hsiang Weng ,  Patrick Cooney ,  Tsung-Kai Kao ,  Stacy Ho

IPC: H03H17/04 ,  H03F3/45

Abstract: The invention provides an anti-aliasing filter (AAF) for discretization at a sampling period. The AAF may include an operational amplifier having an input terminal and an output terminal, a first capacitor coupled between the input terminal and the output terminal, a second capacitor, and a first switch coupled between the first capacitor and the second capacitor. During a first phase, the first switch may conduct the second capacitor to the first capacitor. During a second phase, the first switch may stop conducting the second capacitor to the first capacitor. The first phase may last for one said sampling period.

公开(公告)号：US09853653B2

公开(公告)日：2017-12-26

申请号：US15259292

申请日：2016-09-08

Applicant: MediaTek Inc.

Inventor： Tsung-Kai Kao

IPC: H03M1/06 ,  H03M1/66 ,  H03M3/00 ,  H03M1/08 ,  H03M1/74

CPC classification number: H03M1/06 ,  H03M1/0863 ,  H03M1/66 ,  H03M1/742 ,  H03M3/50

Abstract: Apparatus and methods for reducing noise and distortion in current digital-to-analog converters (IDACs). Compensating capacitors may be connected to current sources in an IDAC. The compensating capacitors may be driven with signals 5 derived from the output of the IDAC to cancel transient current spikes that would otherwise occur on the output of the IDAC.