公开(公告)号：US11205999B2

公开(公告)日：2021-12-21

申请号：US16935142

申请日：2020-07-21

Applicant: MEDIATEK INC.

Inventor： Sung-Han Wen ,  Kuan-Ta Chen

IPC: H03F3/217 ,  H03M1/66 ,  H04L27/12 ,  H04R3/00

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.

公开(公告)号：US20190131935A1

公开(公告)日：2019-05-02

申请号：US16149145

申请日：2018-10-02

Applicant: MEDIATEK INC.

Inventor： Ying-Wei Chou ,  Sung-Han Wen ,  Chen-Chien Lin ,  Jou Lee

IPC: H03F1/34 ,  H03H7/06 ,  H03F3/181 ,  H04R3/04

Abstract: The present invention provides a circuit having a filter with an amplifier circuit for filtering and amplifying an input signal to generate an output signal, wherein a corner frequency of the filter is adjustable to control a settling time of the output signal.

公开(公告)号：US10123115B2

公开(公告)日：2018-11-06

申请号：US15853745

申请日：2017-12-23

Applicant: MediaTek Inc.

Inventor： Sung-Han Wen ,  Yu-Cheng Chang ,  Kuan-Ta Chen

IPC: H04R3/00 ,  H04B3/32 ,  H04R1/10 ,  H04R5/04 ,  H04R29/00

Abstract: A device for removing crosstalk includes a jack to form an electrical connection with a plug, and an audio unit to provide a left audio channel and a right audio channel to the plug. The audio unit includes a crosstalk cancellation circuit. The crosstalk cancellation circuit estimates the crosstalk between the left audio channel and the right audio channel to obtain an estimated right-to-left crosstalk and an estimated left-to-right crosstalk, and to remove the crosstalk by subtracting the estimated right-to-left crosstalk and the estimated left-to-right crosstalk from digital signals in the left audio channel and the right audio channel, respectively.

公开(公告)号：US12160206B2

公开(公告)日：2024-12-03

申请号：US17751630

申请日：2022-05-23

Applicant: MEDIATEK INC.

Inventor： Sujith Kumar Billa ,  Sung-Han Wen

IPC: H03F3/45 ,  H03F1/30 ,  H03F3/00

Abstract: The present invention provides an amplifier circuit, wherein the amplifier circuit includes an input terminal, a capacitor, an amplifier, a feedback circuit and an aliasing tone cancellation circuit. The input terminal is configured to receive a first input signal. The capacitor is coupled to the input terminal. The amplifier is configured to receive the input signal through the capacitor to generate an output signal. The feedback circuit is coupled between an input node and an output node of the amplifier, and is configured to generate a feedback signal according to the output signal, wherein the feedback circuit includes a storage block including a switched-capacitor. The aliasing tone cancellation circuit is coupled between the input terminal of the amplifier circuit and the input node of the amplifier, and configured to generate a signal to cancel or reduce an aliasing tone of the feedback signal according to the input signal.

公开(公告)号：US20240313706A1

公开(公告)日：2024-09-19

申请号：US18433468

申请日：2024-02-06

Applicant: MEDIATEK INC.

Inventor： You-Shin Chen ,  Ya-Chi Chen ,  Sung-Han Wen

IPC: H03F1/02 ,  H03F3/183

CPC classification number: H03F1/0233 ,  H03F3/183 ,  H03F2200/03

Abstract: The present invention provides a multi-stage amplifier, wherein the multi-stage amplifier includes a plurality of amplifier stages and a compensation circuit. The compensation circuit is coupled to an output terminal of one of the plurality of amplifier stages, and the compensation circuit includes a first auxiliary amplifier, a capacitor, a second auxiliary amplifier, a first resistor and a second resistor. The capacitor is coupled between an input terminal and an output terminal of the first auxiliary amplifier. The second auxiliary amplifier is coupled to the first auxiliary amplifier. The first resistor is coupled between an input terminal and an output terminal of the second auxiliary amplifier. The second resistor is coupled between an output terminal of the first auxiliary amplifier and a ground voltage.

公开(公告)号：US20240039548A1

公开(公告)日：2024-02-01

申请号：US18206623

申请日：2023-06-07

Applicant: MEDIATEK INC.

Inventor： Wei-Hao Sun ,  Chuan-Hung Hsiao ,  Sung-Han Wen

IPC: H03M1/06

CPC classification number: H03M1/0604

Abstract: A digital-to-analog converter (DAC) includes a plurality of DAC cells, a mismatch error sorting circuit, and a dynamic element matching (DEM) circuit. The mismatch error sorting circuit generates a sorting result of the plurality of DAC cells according to mismatch error levels of the plurality of DAC cells. The DEM circuit shapes the mismatch error levels of the plurality of DAC cells according to the sorting result of the plurality of DAC cells.

公开(公告)号：US10469037B2

公开(公告)日：2019-11-05

申请号：US15912448

申请日：2018-03-05

Applicant: MEDIATEK INC.

Inventor： Sung-Han Wen ,  Kuan-Ta Chen

IPC: H03F1/14 ,  H03F1/42 ,  H03F1/08 ,  H03F3/45 ,  H03F1/34 ,  H03F3/21

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.

公开(公告)号：US10199995B2

公开(公告)日：2019-02-05

申请号：US15434061

申请日：2017-02-16

Applicant: MEDIATEK INC.

Inventor： Chen-Chien Lin ,  Sung-Han Wen ,  Yu-Cheng Chang

IPC: H03F3/00 ,  H03F3/45 ,  H03G1/00 ,  H03G3/00

Abstract: A programmable amplifier circuit includes an amplifier, an input capacitor coupled to an input of the amplifier, a feedback capacitor coupled to the input of the amplifier and an output of the amplifier, and a switched-capacitor resistor circuit. The switched-capacitor resistor circuit is coupled between the input of the amplifier and the output of the amplifier, and configured for simulating a feedback resistor element to provide a resistance for a feedback path of the amplifier by using at least one capacitor placed between the input of the amplifier and the output of the amplifier to avoid leakage current(s) flowing back to an input of the amplifier.

公开(公告)号：US09888318B2

公开(公告)日：2018-02-06

申请号：US15232802

申请日：2016-08-09

Applicant: MediaTek Inc.

Inventor： Sung-Han Wen ,  Yu-Cheng Chang ,  Kuan-Ta Chen

IPC: H04R3/00 ,  H04B3/32

CPC classification number: H04R3/007 ,  H04B3/32 ,  H04R1/1041 ,  H04R5/04 ,  H04R29/001 ,  H04R2420/09

Abstract: A device includes an audio unit to provide a left audio channel, a right audio channel and a microphone channel to a headset plug. The device also includes a headset jack to form an electrical connection with the headset plug, and a swap switch configurable to swap connections of a ground terminal and a microphone terminal of the headset plug to the audio unit. The audio unit further includes: a first crosstalk cancellation circuit to subtract an estimated right-to-left crosstalk from a left digital path of the left audio channel, and to subtract an estimated left-to-right crosstalk from a right digital path of the right audio channel; and a second crosstalk cancellation circuit to subtract an estimated left-to-microphone crosstalk and an estimated right-to-microphone crosstalk from a microphone digital path of the microphone channel.

公开(公告)号：US20230396152A1

公开(公告)日：2023-12-07

申请号：US18144839

申请日：2023-05-08

Applicant: MEDIATEK INC.

Inventor： Chuan-Hung Hsiao ,  Sung-Han Wen

IPC: H02M1/12 ,  H02M7/53

CPC classification number: H02M1/126 ,  H02M7/53

Abstract: A noise filter circuit includes a filter and a transistor off-resistance control circuit. The filter includes a first transistor and a charge storage component. The first transistor has off-resistance when turned off or operated under sub-threshold region. A control terminal of the first transistor is not directly tied to a reference voltage, and is used to receive a first control voltage. The charge storage component has one terminal coupled to a connection terminal of the first transistor. The transistor off-resistance control circuit is coupled to the first transistor, and arranged to set the first control voltage for controlling the off-resistance of the first transistor.