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公开(公告)号：US20170150258A1
公开(公告)日：2017-05-25
申请号：US15232802
申请日：2016-08-09
申请人： MediaTek Inc.
发明人： Sung-Han Wen , Yu-Cheng Chang , Kuan-Ta Chen
CPC分类号： H04R3/007 , H04B3/32 , H04R1/1041 , H04R5/04 , H04R29/001 , H04R2420/09
摘要： 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.
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公开(公告)号：US20230078955A1
公开(公告)日：2023-03-16
申请号：US17884589
申请日：2022-08-10
申请人： MEDIATEK INC.
发明人： Shih-Hsiung Chien , Sung-Han Wen , Kuan-Ta Chen
IPC分类号： H03F3/04
摘要： The present invention provides a linear amplifier including an amplifier stage, a DC-shifting stage, a compensation network and a power stage. The amplifier stage is configured to generate a first signal and a second signal. The DC-shifting stage is configured to adjust a DC voltage of the first signal and a DC voltage of the second signal to generate an adjusted first signal and an adjusted second signal. The compensation network is configured to generate a first driving signal and a second driving signal according to the first signal, the second signal, the adjusted first signal and the adjusted second signal. The power stage is configured to generate an output signal according to the first driving signal and the second driving signal.
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公开(公告)号：US11309839B2
公开(公告)日：2022-04-19
申请号：US16793226
申请日：2020-02-18
申请人： MEDIATEK INC.
发明人： Sung-Han Wen , Kuan-Ta Chen
摘要： A multi-stage amplifier with a high signal-to-noise ratio is introduced. Multiple amplification stages are cascaded between an input terminal and an output terminal of the amplifier. A controller switches the output stage among the multiple amplification stages from a normal mode to an attenuation mode in response to the amplifier input being lower than the threshold. In the attenuation mode, the output stage provides an attenuation resistor coupled in series with the load resistor of the amplifier. Noise is successfully attenuated by the attenuation-mode output stage.
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公开(公告)号：US11205999B2
公开(公告)日：2021-12-21
申请号：US16935142
申请日：2020-07-21
申请人： MEDIATEK INC.
发明人： Sung-Han Wen , Kuan-Ta Chen
摘要： 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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15.发明申请公开(公告)号：US20210075386A1
公开(公告)日：2021-03-11
申请号：US16921922
申请日：2020-07-06
申请人： MEDIATEK INC.
发明人： Yu-Hung Lin , Kuan-Ta Chen
IPC分类号： H03F3/45
摘要： An operational amplifier includes a single-stage amplifier and a current controller. The single-stage amplifier receives an input signal, and amplifies the input signal to generate an output signal, wherein the single-stage amplifier includes a voltage controlled current source circuit that operates in response to a bias voltage input. The current controller receives the input signal, and generates the bias voltage input according to the input signal.
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公开(公告)号：US10123115B2
公开(公告)日：2018-11-06
申请号：US15853745
申请日：2017-12-23
申请人： MediaTek Inc.
发明人： Sung-Han Wen , Yu-Cheng Chang , Kuan-Ta Chen
摘要： 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.
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17.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
申请人： MEDIATEK INC.
IPC分类号： H03M1/06
CPC分类号： H03M1/0604
摘要： 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
申请人： MEDIATEK INC.
发明人： Yi-Wei Huang , Sung-Han Wen , Kuan-Ta Chen
IPC分类号： H03F3/217
CPC分类号： H03F3/217
摘要： 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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19.发明授权公开(公告)号：US11664774B2
公开(公告)日：2023-05-30
申请号：US17736062
申请日：2022-05-03
申请人： MEDIATEK INC.
发明人： Yu-Hung Lin , Kuan-Ta Chen
IPC分类号： H03F3/45
CPC分类号： H03F3/45179 , H03F2203/45248 , H03F2203/45508
摘要： An operational amplifier includes a single-stage amplifier and a current controller. The single-stage amplifier receives an input signal, and amplifies the input signal to generate an output signal, wherein the single-stage amplifier includes a voltage controlled current source circuit that operates in response to a bias voltage input. The current controller receives the input signal, and generates the bias voltage input according to the input signal. The bias voltage input includes a first bias voltage, a second bias voltage, a third bias voltage, and a fourth bias voltage. None of the first bias voltage, the second bias voltage, the third bias voltage, and the fourth bias voltage is directly set by the input signal of the single-stage amplifier.
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20.发明申请公开(公告)号：US20220263480A1
公开(公告)日：2022-08-18
申请号：US17736062
申请日：2022-05-03
申请人： MEDIATEK INC.
发明人： Yu-Hung Lin , Kuan-Ta Chen
IPC分类号： H03F3/45
摘要： An operational amplifier includes a single-stage amplifier and a current controller. The single-stage amplifier receives an input signal, and amplifies the input signal to generate an output signal, wherein the single-stage amplifier includes a voltage controlled current source circuit that operates in response to a bias voltage input. The current controller receives the input signal, and generates the bias voltage input according to the input signal. The bias voltage input includes a first bias voltage, a second bias voltage, a third bias voltage, and a fourth bias voltage. None of the first bias voltage, the second bias voltage, the third bias voltage, and the fourth bias voltage is directly set by the input signal of the single-stage amplifier.
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