-
公开(公告)号：US09716499B2
公开(公告)日：2017-07-25
申请号：US14962560
申请日：2015-12-08
Applicant: MediaTek Inc.
Inventor： Tsun-Yuan Fan , Wen-Hua Chang
CPC classification number: H03K19/017509 , G05F3/26 , H03F3/19 , H03F3/24 , H03F3/45188 , H03F3/45273 , H03F3/45659 , H03F2200/84 , H03F2200/91 , H03F2203/45008 , H03F2203/45082 , H03F2203/45418 , H03F2203/45481 , H04B1/04 , H04B2001/0408
Abstract: A current amplifier and a transmitter using the same. The current amplifier has a first and second transistor and a voltage level shifting unit. The first transistor has a gate receiving an input current and a drain receiving a driving current. The voltage level shifting unit providing a voltage shift is coupled between the drain of the first transistor and the gate of the second transistor. An output current is generated at the drain of the second transistor.
-
公开(公告)号：US20170077883A1
公开(公告)日：2017-03-16
申请号：US15166066
申请日：2016-05-26
Applicant: MediaTek Inc.
Inventor： Wen-Hua Chang
CPC classification number: H03F3/45686 , H03F1/083 , H03F1/30 , H03F3/005 , H03F3/45 , H03F3/45273 , H03F2200/151 , H03F2200/153 , H03F2200/159 , H03F2200/42 , H03F2200/75 , H03F2203/45012 , H03F2203/45061 , H03F2203/45156 , H03F2203/45221 , H03F2203/45244 , H03F2203/45514 , H03F2203/45546 , H03F2203/45551 , H03F2203/45616 , H03H7/004
Abstract: A switched-capacitor circuit comprising a differential operational amplifier and a feedback circuit is described. In some embodiments, the feedback circuit may be configured to provide a reference voltage that is insensitive to temperature and/or process variations. In some embodiments, the feedback circuit may be configured to mitigate the time delay associated with one or more capacitors of the switched-capacitor circuit. The switched-capacitor circuit may be controlled by a pair of control signals. During a first phase, one or more capacitors may be charged, or discharged, through an input signal. During a second phase, the electric charge of the one or more capacitors may be retained.
Abstract translation: 描述了包括差分运算放大器和反馈电路的开关电容器电路。 在一些实施例中，反馈电路可以被配置为提供对温度和/或过程变化不敏感的参考电压。 在一些实施例中，反馈电路可以被配置为减轻与开关电容器电路的一个或多个电容器相关联的时间延迟。 开关电容电路可以由一对控制信号控制。 在第一阶段期间，可以通过输入信号对一个或多个电容器进行充电或放电。 在第二阶段期间，可以保持一个或多个电容器的电荷。
-
公开(公告)号：US09515610B2
公开(公告)日：2016-12-06
申请号：US14572752
申请日：2014-12-16
Applicant: MEDIATEK INC.
Inventor： Wen-Hua Chang
CPC classification number: H03F1/0205 , H03F1/56 , H03F3/45076 , H03F3/45179 , H03F3/45273 , H03F3/45475 , H03F2200/91 , H03F2203/45116 , H03F2203/45336 , H03F2203/45392 , H03F2203/45394 , H03F2203/45528
Abstract: A line driver and a method for driving a load are proposed. The line driver includes a current amplifier and a feedback network. The current amplifier has an input node arranged to receive an input current of the line driver, and an output node arranged to produce an output current. The feedback network is coupled between the input node and the output node of the current amplifier, wherein a portion of the output current of the line driver is guided to the feedback network, and an equivalent impedance obtained by looking into the output node of the current amplifier with the feedback network substantially equals an impedance of the load.
Abstract translation: 提出了线驱动器和驱动负载的方法。 线路驱动器包括电流放大器和反馈网络。 电流放大器具有布置成接收线路驱动器的输入电流的输入节点和布置成产生输出电流的输出节点。 反馈网络耦合在电流放大器的输入节点和输出节点之间，其中线路驱动器的输出电流的一部分被引导到反馈网络，并且通过查看电流的输出节点获得的等效阻抗 具有反馈网络的放大器基本上等于负载的阻抗。
-
公开(公告)号：US09467160B2
公开(公告)日：2016-10-11
申请号：US14538013
申请日：2014-11-11
Applicant: MediaTek Inc.
Inventor： Wen-Hua Chang
Abstract: An ADC is provided. The ADC includes a plurality of pre-amplifiers, dynamic comparators coupled to the pre-amplifiers, interpolators and an encoder. Each pre-amplifier provides a pair of differential outputs according to a pair of differential analog signals and a first reference voltage and a second reference voltage different from the first reference voltage. Each dynamic comparator provides a first comparing signal and a second comparing signal according to the pair of differential outputs of the corresponding pre-amplifier. Each interpolator provides an interpolating signal according to the first and second comparing signals of two of the dynamic comparators. The encoder provides a digital output according to the interpolating signals. The first and second comparing signals are the same in a reset phase, and the first and second comparing signals are complementary according to the pair of differential outputs of the corresponding pre-amplifier in an evaluation phase.
Abstract translation: 提供了一个ADC。 ADC包括多个预放大器，耦合到前置放大器，内插器和编码器的动态比较器。 每个前置放大器根据一对差分模拟信号和不同于第一参考电压的第一参考电压和第二参考电压提供一对差分输出。 每个动态比较器根据相应的前置放大器的差分输出对提供第一比较信号和第二比较信号。 每个内插器根据两个动态比较器的第一和第二比较信号提供内插信号。 编码器根据内插信号提供数字输出。 第一和第二比较信号在复位阶段相同，并且第一和第二比较信号根据评估阶段中对应的前置放大器的差分输出的对而互补。
-
公开(公告)号：US09374046B2
公开(公告)日：2016-06-21
申请号：US13910615
申请日：2013-06-05
Applicant: MediaTek Inc.
Inventor： Wen-Hua Chang , Tsung-Yi Chou
CPC classification number: H03F3/16 , G05F3/26 , H03F3/245 , H03F3/45188 , H03F3/45273 , H03F2200/84 , H03F2203/45054 , H03F2203/45481
Abstract: A current amplifier and a transmitter using the same. The current amplifier includes: a first transistor having a gate coupled to a former-stage circuit, a drain coupled to a current source, and a source biased at a constant voltage level; a second transistor having a gate coupled to the current source and having a source and a drain; a first impedance circuit coupled between the gate of the first transistor and the source of the second transistor; and a second impedance circuit coupled between the source of the second transistor and a ground terminal. The current amplifier receives an input current from the former-stage circuit and generates an output current at the drain of the second transistor. Note that no current source is connected to the source of the first transistor.
Abstract translation: 电流放大器和使用该放大器的发射器。 电流放大器包括：第一晶体管，其具有耦合到前级电路的栅极，耦合到电流源的漏极和以恒定电压电平偏置的源极; 第二晶体管，具有耦合到电流源并具有源极和漏极的栅极; 耦合在第一晶体管的栅极和第二晶体管的源极之间的第一阻抗电路; 以及耦合在所述第二晶体管的源极和接地端子之间的第二阻抗电路。 电流放大器接收来自前级电路的输入电流，并在第二晶体管的漏极处产生输出电流。 注意，没有电流源连接到第一晶体管的源极。
-
Patent Agency Ranking
公开(公告)号：US20160173033A1
公开(公告)日：2016-06-16
申请号：US14572752
申请日：2014-12-16
Applicant: MEDIATEK INC.
Inventor： Wen-Hua Chang
CPC classification number: H03F1/0205 , H03F1/56 , H03F3/45076 , H03F3/45179 , H03F3/45273 , H03F3/45475 , H03F2200/91 , H03F2203/45116 , H03F2203/45336 , H03F2203/45392 , H03F2203/45394 , H03F2203/45528
Abstract: A line driver and a method for driving a load are proposed. The line driver includes a current amplifier and a feedback network. The current amplifier has an input node arranged to receive an input current of the line driver, and an output node arranged to produce an output current. The feedback network is coupled between the input node and the output node of the current amplifier, wherein a portion of the output current of the line driver is guided to the feedback network, and an equivalent impedance obtained by looking into the output node of the current amplifier with the feedback network substantially equals an impedance of the load.
Abstract translation: 提出了线驱动器和驱动负载的方法。 线路驱动器包括电流放大器和反馈网络。 电流放大器具有布置成接收线路驱动器的输入电流的输入节点和布置成产生输出电流的输出节点。 反馈网络耦合在电流放大器的输入节点和输出节点之间，其中线路驱动器的输出电流的一部分被引导到反馈网络，并且通过查看电流的输出节点获得的等效阻抗 具有反馈网络的放大器基本上等于负载的阻抗。
-
公开(公告)号：US09276597B1
公开(公告)日：2016-03-01
申请号：US14618263
申请日：2015-02-10
Applicant: MediaTek Inc.
Inventor： Wen-Hua Chang
CPC classification number: H03M1/1023 , H03M1/0631 , H03M1/365
Abstract: An analog-to-digital converter is provided. Each pre-amplifier provides a pair of differential outputs according to a pair of differential analog input signals and a first reference voltage and a second reference voltage from a resistor chain, wherein the first reference voltage is different from the second reference voltage. Each dynamic comparator provides a first comparing signal and a second comparing signal according to the pair of differential outputs of the pre-amplifier. Each pre-amplifier includes a first calibration unit for calibrating a first offset voltage from the pre-amplifier at the pair of differential outputs at a specific temperature, and a second calibration unit for calibrating a second offset voltage from the corresponding dynamic comparator at the pair of differential outputs.
Abstract translation: 提供了一个模拟 - 数字转换器。 每个前置放大器根据一对差分模拟输入信号和来自电阻链的第一参考电压和第二参考电压提供一对差分输出，其中第一参考电压不同于第二参考电压。 每个动态比较器根据前置放大器的差分输出对提供第一比较信号和第二比较信号。 每个前置放大器包括用于在特定温度下校准来自前置放大器的差分输出的第一偏移电压的第一校准单元和用于校准来自对中的相应动态比较器的第二偏移电压的第二校准单元 的差分输出。
-
公开(公告)号：US09203423B2
公开(公告)日：2015-12-01
申请号：US13972920
申请日：2013-08-22
Applicant: MEDIATEK INC.
Inventor： Wen-Hua Chang
CPC classification number: H03M1/66 , H03F1/0272 , H03F1/3205 , H03F1/3217 , H03F3/303 , H03F2200/129 , H03F2200/91 , H03F2203/30031 , H03F2203/30078 , H03F2203/30111
Abstract: A signal generation apparatus includes a digital-to-analog converter, a bias stage and a class AB output stage. The digital-to-analog converter is arranged for outputting a current as an input signal. The bias stage is coupled to the digital-to-analog converter, and is arranged for generating a bias signal according to at least the input signal. The class AB output stage is coupled to the bias stage, and is arranged for generating an output signal at an output node of the signal generation apparatus according to the bias signal, wherein the output signal includes a first signal component and a second signal component, both the first signal component and the second signal component correspond to the input signal, and there is a linear relation between the output signal and the input signal.
Abstract translation: 信号发生装置包括数模转换器，偏置级和AB类输出级。 数模转换器用于输出电流作为输入信号。 偏置级耦合到数模转换器，并且被布置为根据至少输入信号产生偏置信号。 AB类输出级耦合到偏置级，并且被配置为根据偏置信号在信号发生装置的输出节点处产生输出信号，其中输出信号包括第一信号分量和第二信号分量， 第一信号分量和第二信号分量都对应于输入信号，并且在输出信号和输入信号之间存在线性关系。
-
公开(公告)号：US20150054584A1
公开(公告)日：2015-02-26
申请号：US13972920
申请日：2013-08-22
Applicant: MEDIATEK INC.
Inventor： Wen-Hua Chang
CPC classification number: H03M1/66 , H03F1/0272 , H03F1/3205 , H03F1/3217 , H03F3/303 , H03F2200/129 , H03F2200/91 , H03F2203/30031 , H03F2203/30078 , H03F2203/30111
Abstract: A signal generation apparatus includes a digital-to-analog converter, a bias stage and a class AB output stage. The digital-to-analog converter is arranged for outputting a current as an input signal. The bias stage is coupled to the digital-to-analog converter, and is arranged for generating a bias signal according to at least the input signal. The class AB output stage is coupled to the bias stage, and is arranged for generating an output signal at an output node of the signal generation apparatus according to the bias signal, wherein the output signal includes a first signal component and a second signal component, both the first signal component and the second signal component correspond to the input signal, and there is a linear relation between the output signal and the input signal.
Abstract translation: 信号发生装置包括数模转换器，偏置级和AB类输出级。 数模转换器用于输出电流作为输入信号。 偏置级耦合到数模转换器，并且被布置为根据至少输入信号产生偏置信号。 AB类输出级耦合到偏置级，并且被配置为根据偏置信号在信号发生装置的输出节点处产生输出信号，其中输出信号包括第一信号分量和第二信号分量， 第一信号分量和第二信号分量都对应于输入信号，并且在输出信号和输入信号之间存在线性关系。
-
公开(公告)号：US08836565B1
公开(公告)日：2014-09-16
申请号：US14038776
申请日：2013-09-27
Applicant: Mediatek Inc.
Inventor： Wen-Hua Chang
IPC: H03M1/12
CPC classification number: H03M1/124
Abstract: An analog to digital converter can operate in a sampling mode or in a comparing mode. The analog to digital converter comprises: a comparator; a first capacitor, comprising a first terminal coupled to a first input terminal of the comparator; a second capacitor; a first switch module; a control unit, for controlling the conductive states of the first switch module corresponding to the sampling mode or the comparing mode. The first capacitor samples a value of a first input signal and the second capacitor samples a value of a first reference signal via the first switch module in the sampling mode. The first capacitor and the second capacitor are not coupled to each other in the sampling mode. The first capacitor and the second capacitor are coupled in series via the first switch module in the comparing mode.
Abstract translation: 模数转换器可以在采样模式或比较模式下工作。 模数转换器包括：比较器; 第一电容器，包括耦合到比较器的第一输入端的第一端子; 第二电容器; 第一开关模块; 控制单元，用于控制对应于采样模式或比较模式的第一开关模块的导通状态。 第一电容器采样第一输入信号的值，并且第二电容器以采样模式经由第一开关模块对第一参考信号的值进行采样。 第一电容器和第二电容器在采样模式下不相互耦合。 第一电容器和第二电容器在比较模式下通过第一开关模块串联耦合。
-
-
-
-
-
-
-
-
-
Search Results
11
records
(took 0.015 seconds)
