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公开(公告)号：US11632087B2
公开(公告)日：2023-04-18
申请号：US17840874
申请日：2022-06-15
Applicant: MEDIATEK INC.
Inventor： Sung-Han Wen
Abstract: A high-linearity amplifier including a main operational amplifier, a feedback circuit, and a compensation circuit is shown. The feedback circuit couples an output signal of the main operational amplifier to an input port of the main operational amplifier. The compensation circuit couples a former-stage circuit of the amplifier to the input port of the main operational amplifier to compensate for the non-linearity of the feedback circuit. The compensation circuit and the feedback circuit form an inverse paralleling linearization architecture. In the inverse paralleling linearization architecture, a resistor in the feedback circuit corresponds to a resistor in the compensation circuit which is biased in an inversed way in comparison with the corresponding resistor in the feedback circuit.
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公开(公告)号：US11196387B2
公开(公告)日：2021-12-07
申请号：US16849384
申请日：2020-04-15
Applicant: MEDIATEK INC.
Inventor： Sung-Han Wen
Abstract: An amplifier circuit with in-band gain degradation compensation is shown. The amplifier circuit has an input-stage amplifier, at least one intermediate-stage amplifier, and an output-stage amplifier cascaded between an input port and an output port of the amplifier circuit. A compensation capacitor is coupled between the output port of the amplifier circuit and an output port of the input-stage amplifier. A high-order damping circuit is coupled to an output port of the intermediate-stage amplifier.
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公开(公告)号：US20210119589A1
公开(公告)日：2021-04-22
申请号：US16935142
申请日：2020-07-21
Applicant: MEDIATEK INC.
Inventor： Sung-Han Wen , Kuan-Ta Chen
Abstract: The present invention provides an amplifier including a DAC, an analog signal processing circuit, a digital signal processing circuit, a signal detector and a driving stage is disclosed. The DAC is configured to perform a digital-to-analog conversion operation on a digital input signal to generate an analog input signal. The analog signal processing circuit is configured to generate a first processed signal according to the analog input signal and a feedback signal. The digital signal processing circuit is configured to process the digital input signal to generate a second processed signal. The signal detector is configured to detect strength of the digital input signal to generate a mode selection signal. The driving stage is configured to refer to the mode selection signal to receive one of the first processed signal and the second processed signal to generate an output signal, wherein the feedback signal is generated by the output signal.
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公开(公告)号：US10574212B2
公开(公告)日：2020-02-25
申请号：US16163625
申请日：2018-10-18
Applicant: MEDIATEK Inc.
Inventor： Sung-Han Wen , Chuan-Hung Hsiao
Abstract: A circuit for low-noise reference signal generation comprising a filter unit and a functional unit. The filter unit comprises a transistor and an energy storage component. The transistor comprises a first node, a second node, a control node and a body node. The first node is configured to receive an input signal. The second node is configured to output a filtered signal. The control node is configured to receive a control signal for controlling the transistor to turn on or off. The body node is configured to couple to the input signal, the output signal or a signal which is similar to the input signal or the output signal. The energy storage component is coupled to the second node of the transistor. The functional unit is coupled to the second node of the transistor and the energy storage component. The functional unit has high input impedance.
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公开(公告)号：US10555269B2
公开(公告)日：2020-02-04
申请号：US16121644
申请日：2018-09-05
Applicant: MEDIATEK INC.
Inventor： Sung-Han Wen , Ya-Chi Chen
Abstract: The present invention provides an amplifier circuit, wherein the amplifier circuit includes a DAC, an output stage and a detector. In the operations of the amplifier circuit, the DAC is arranged for performing a digital-to-analog converting operation upon a digital input signal to generate an analog signal, the output stage is arranged for receiving the analog signal to generate an output signal, and the detector is arranged for detecting a characteristic of the input signal, and referring to the characteristic of the input signal to generate at least one control signal to adjust the output stage at a zero-crossing point of the output signal.
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Patent Agency Ranking
公开(公告)号：US20190199300A1
公开(公告)日：2019-06-27
申请号：US16151339
申请日：2018-10-04
Applicant: MEDIATEK INC.
Inventor： Sung-Han Wen , Chien-Ming Chen , Chuan-Hung Hsiao
Abstract: The present invention provides a class-G amplifier, wherein the class-G amplifier includes an amplifier stage, an impedance detector and a power source. In the operations of the class-G amplifier, the amplifier stage is supplied by a supply voltage, and amplifies an input audio signal to generate an output audio signal, and the impedance detector is configured to detect an output impedance of the amplifier stage to generate a detection result, and the power source refers to the detection result to determine a level and a switching frequency of the supply voltage.
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公开(公告)号：US20180309416A1
公开(公告)日：2018-10-25
申请号：US15912448
申请日：2018-03-05
Applicant: MEDIATEK INC.
Inventor： Sung-Han Wen , Kuan-Ta Chen
CPC classification number: H03F1/42 , H03F1/083 , H03F1/086 , H03F1/14 , H03F1/34 , H03F3/21 , H03F3/45179 , H03F3/45475 , H03F2200/153 , H03F2200/408 , H03F2200/456
Abstract: An amplifier circuit has a multi-stage amplifier, a compensation capacitor, and compensation circuits. The multi-stage amplifier has amplifiers cascaded between an input port and an output port of the multi-stage amplifier. The amplifiers include at least a first-stage amplifier, a second-stage amplifier and a third-stage amplifier. The compensation capacitor is coupled between the output port of the multi-stage amplifier and an output port of the first-stage amplifier. The compensation circuits include a first compensation circuit and a second compensation circuit. The first compensation circuit is coupled to the output port of the first-stage amplifier. The second compensation circuit is coupled to an output port of the second-stage amplifier.
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28.发明授权公开(公告)号：US08952757B2
公开(公告)日：2015-02-10
申请号：US13922884
申请日：2013-06-20
Applicant: MediaTek Inc.
Inventor： Sung-Han Wen , Chien-Chung Yang
CPC classification number: H03G3/004 , H03F1/301 , H03F3/3022 , H03G3/007
Abstract: An amplifier circuit is disclosed. The amplifier circuit includes a detection circuit, a control amplifier circuit and an output stage. The detection circuit detects disturbances occurring in a first supply voltage and provides detection results. The control amplifier circuit controls a first voltage provided to a first control node and a second voltage provided to a second control node in response to the detection results. The output stage circuit includes a first output power transistor coupled to the control amplifier circuit at the first control node and a second output power transistor coupled to the control amplifier circuit at the second control node. The first voltage and the second voltage are controlled differently when a disturbance is detected to have occurred.
Abstract translation: 公开了一种放大器电路。 放大器电路包括检测电路，控制放大器电路和输出级。 检测电路检测在第一电源电压中发生的干扰并提供检测结果。 响应于检测结果，控制放大器电路控制提供给第一控制节点的第一电压和提供给第二控制节点的第二电压。 输出级电路包括耦合到第一控制节点处的控制放大器电路的第一输出功率晶体管和耦合到第二控制节点处的控制放大器电路的第二输出功率晶体管。 当检测到发生干扰时，第一电压和第二电压被不同地控制。
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29.发明公开公开(公告)号：US20230412181A1
公开(公告)日：2023-12-21
申请号：US18198283
申请日：2023-05-16
Applicant: MEDIATEK INC.
Inventor： Chuan-Hung Hsiao , SATYA NARAYANA GANTA , Sung-Han Wen , Kuan-Ta Chen
IPC: H03M1/06
CPC classification number: H03M1/0604
Abstract: A tri-level digital-to-analog converter (DAC) element includes a first DAC cell. The first DAC cell includes a first reference circuit, a second reference circuit, and a switch circuit. The first reference circuit provides a first reference signal. The second reference circuit provides a second reference signal. The first switch circuit receives a control input from an input port of the tri-level DAC element, and controls interconnection between the first reference circuit, the second reference circuit, and an output port of the tri-level DAC element according to the control input. During a period in which the tri-level DAC element operates in a “0” state, the first switch circuit is arranged to couple at least one of the first reference circuit and the second reference circuit to the output port of the tri-level DAC element.
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公开(公告)号：US20230231523A1
公开(公告)日：2023-07-20
申请号：US18085579
申请日：2022-12-21
Applicant: MEDIATEK INC.
Inventor： Yi-Wei Huang , Sung-Han Wen , Kuan-Ta Chen
IPC: H03F3/217
CPC classification number: H03F3/217
Abstract: The present invention provides an amplifier system including an audio amplifier and a power converter. The audio amplifier is supplied by at least a first supply voltage and a second supply voltage, and the audio amplifier is configured to receive an audio signal to generate an output signal. The power converter includes only one inductor, and is configured to generate the first supply voltage and the second supply voltage according to an input voltage.
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