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公开(公告)号：US10027300B2
公开(公告)日：2018-07-17
申请号：US15241035
申请日：2016-08-18
申请人： MEDIATEK INC.
发明人： Lai-Ching Lin , Ming-Da Tsai
IPC分类号： H03F1/22 , H03G3/30 , H03F3/193 , H03F3/21 , H03K5/1532 , H03F1/52 , H03F3/195 , H03F3/24 , H03F3/45 , H03F3/72
摘要： The present invention provides a control circuit to stabilize an output power of a power amplifier. The control circuit comprises a voltage clamping loop, a current clamping loop and a loop for reducing power variation under VSWR, where the voltage clamping loop is used to clamp an output voltage of the power amplifier within a defined voltage range, the current clamping loop is used to clamp a current of the power amplifier within a defined current range, and the loop for reducing power variation under VSWR is implemented by an impedance detector to compensate the output power under VSWR variation.
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公开(公告)号：US20170141748A1
公开(公告)日：2017-05-18
申请号：US15241035
申请日：2016-08-18
申请人： MEDIATEK INC.
发明人： Lai-Ching Lin , Ming-Da Tsai
IPC分类号： H03G3/30 , H03F3/193 , H03K5/1532 , H03F3/21
CPC分类号： H03G3/3042 , H03F1/223 , H03F1/523 , H03F3/193 , H03F3/195 , H03F3/21 , H03F3/245 , H03F3/45179 , H03F3/45475 , H03F3/72 , H03F2200/108 , H03F2200/153 , H03F2200/18 , H03F2200/228 , H03F2200/234 , H03F2200/258 , H03F2200/301 , H03F2200/393 , H03F2200/435 , H03F2200/441 , H03F2200/451 , H03F2200/462 , H03F2200/471 , H03F2200/477 , H03F2200/481 , H03F2200/498 , H03F2200/555 , H03F2200/75 , H03F2200/78 , H03K5/1532
摘要： The present invention provides a control circuit to stabilize an output power of a power amplifier. The control circuit comprises a voltage clamping loop, a current clamping loop and a loop for reducing power variation under VSWR, where the voltage clamping loop is used to clamp an output voltage of the power amplifier within a defined voltage range, the current clamping loop is used to clamp a current of the power amplifier within a defined current range, and the loop for reducing power variation under VSWR is implemented by an impedance detector to compensate the output power under VSWR variation.
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公开(公告)号：US20180069518A1
公开(公告)日：2018-03-08
申请号：US15800087
申请日：2017-11-01
申请人： MEDIATEK INC.
发明人： Lai-Ching Lin
CPC分类号： H03G3/3042 , H03F1/0272 , H03F3/193 , H03F3/21 , H03F3/245 , H03F3/45179 , H03F3/45475 , H03F2200/09 , H03F2200/18 , H03F2200/451 , H03F2200/456 , H03F2200/462 , H03F2200/481 , H03F2200/541 , H03F2200/75
摘要： An amplifier system includes a main amplifier, a cross-over current detector and a controller. The main amplifier includes at least a first driving transistor and a second driving transistor serving as a differential pair, wherein the first driving transistor and the second driving transistor are arranged to receive a first input signal and a second input signal, respectively. The cross-over current detector is coupled to the main amplifier, and is arranged for detecting a cross-over current of the main amplifier, wherein the cross-over current of the main amplifier is an overlapped current from the differential pair. The controller is coupled to the main amplifier and the cross-over current detector, and is arranged for generating a control signal to control a gain of the main amplifier according to an output of the main amplifier and the cross-over current of the main amplifier.
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公开(公告)号：US09837974B2
公开(公告)日：2017-12-05
申请号：US15238729
申请日：2016-08-17
申请人： MEDIATEK INC.
发明人： Lai-Ching Lin
CPC分类号： H03G3/3042 , H03F1/0272 , H03F3/193 , H03F3/21 , H03F3/245 , H03F3/45179 , H03F3/45475 , H03F2200/09 , H03F2200/18 , H03F2200/451 , H03F2200/456 , H03F2200/462 , H03F2200/481 , H03F2200/541 , H03F2200/75
摘要： An amplifier system includes a main amplifier, a cross-over current detector and a controller. The main amplifier includes at least a first driving transistor and a second driving transistor serving as a differential pair, wherein the first driving transistor and the second driving transistor are arranged to receive a first input signal and a second input signal, respectively. The cross-over current detector is coupled to the main amplifier, and is arranged for detecting a cross-over current of the main amplifier, wherein the cross-over current of the main amplifier is an overlapped current from the differential pair. The controller is coupled to the main amplifier and the cross-over current detector, and is arranged for generating a control signal to control a gain of the main amplifier according to an output of the main amplifier and the cross-over current of the main amplifier.
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公开(公告)号：US20170141747A1
公开(公告)日：2017-05-18
申请号：US15238729
申请日：2016-08-17
申请人： MEDIATEK INC.
发明人： Lai-Ching Lin
CPC分类号： H03G3/3042 , H03F1/0272 , H03F3/193 , H03F3/21 , H03F3/245 , H03F3/45179 , H03F3/45475 , H03F2200/09 , H03F2200/18 , H03F2200/451 , H03F2200/456 , H03F2200/462 , H03F2200/481 , H03F2200/541 , H03F2200/75
摘要： An amplifier system includes a main amplifier, a cross-over current detector and a controller. The main amplifier includes at least a first driving transistor and a second driving transistor serving as a differential pair, wherein the first driving transistor and the second driving transistor are arranged to receive a first input signal and a second input signal, respectively. The cross-over current detector is coupled to the main amplifier, and is arranged for detecting a cross-over current of the main amplifier, wherein the cross-over current of the main amplifier is an overlapped current from the differential pair. The controller is coupled to the main amplifier and the cross-over current detector, and is arranged for generating a control signal to control a gain of the main amplifier according to an output of the main amplifier and the cross-over current of the main amplifier.
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6.发明授权公开(公告)号：US09654074B2
公开(公告)日：2017-05-16
申请号：US14919737
申请日：2015-10-22
申请人： MEDIATEK INC.
发明人： Lai-Ching Lin
CPC分类号： H03G3/30 , H03F1/0205 , H03F1/0277 , H03F1/223 , H03F1/301 , H03F3/211 , H03F3/45179 , H03F2200/462 , H03F2200/78 , H03F2203/45114 , H03F2203/45116
摘要： A variable gain amplifier circuit comprises a main amplifier, a current sensing circuit, a variable loading and a control amplifier. The main amplifier is configured for amplifying an input signal to generate an output signal. The current sensing circuit is coupled to the main amplifier, and is configured for generating a sensed current related to a current flowing through the main amplifier. The variable loading is coupled to the current mirror via a node, wherein the sensed current flows through the node and the variable loading. The control amplifier is coupled to the node and the main amplifier, and is configured for receiving a control voltage and a voltage of the node to generate an adjustment signal to control a gain of the main amplifier, wherein a resistance of the variable loading has a nonlinear relationship with the control voltage.
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公开(公告)号：US10263585B2
公开(公告)日：2019-04-16
申请号：US15800087
申请日：2017-11-01
申请人： MEDIATEK INC.
发明人： Lai-Ching Lin
摘要： An amplifier system includes a main amplifier, a cross-over current detector and a controller. The main amplifier includes at least a first driving transistor and a second driving transistor serving as a differential pair, wherein the first driving transistor and the second driving transistor are arranged to receive a first input signal and a second input signal, respectively. The cross-over current detector is coupled to the main amplifier, and is arranged for detecting a cross-over current of the main amplifier, wherein the cross-over current of the main amplifier is an overlapped current from the differential pair. The controller is coupled to the main amplifier and the cross-over current detector, and is arranged for generating a control signal to control a gain of the main amplifier according to an output of the main amplifier and the cross-over current of the main amplifier.
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8.发明申请VARIABLE GAIN AMPLIFIER CIRCUIT, CONTROLLER OF MAIN AMPLIFIER AND ASSOCIATED CONTROL METHOD 有权可变增益放大器电路，主放大器控制器及相关控制方法公开(公告)号：US20160352298A1
公开(公告)日：2016-12-01
申请号：US14919737
申请日：2015-10-22
申请人： MEDIATEK INC.
发明人： Lai-Ching Lin
CPC分类号： H03G3/30 , H03F1/0205 , H03F1/0277 , H03F1/223 , H03F1/301 , H03F3/211 , H03F3/45179 , H03F2200/462 , H03F2200/78 , H03F2203/45114 , H03F2203/45116
摘要： A variable gain amplifier circuit comprises a main amplifier, a current sensing circuit, a variable loading and a control amplifier. The main amplifier is configured for amplifying an input signal to generate an output signal. The current sensing circuit is coupled to the main amplifier, and is configured for generating a sensed current related to a current flowing through the main amplifier. The variable loading is coupled to the current mirror via a node, wherein the sensed current flows through the node and the variable loading. The control amplifier is coupled to the node and the main amplifier, and is configured for receiving a control voltage and a voltage of the node to generate an adjustment signal to control a gain of the main amplifier, wherein a resistance of the variable loading has a nonlinear relationship with the control voltage.
摘要翻译： 可变增益放大器电路包括主放大器，电流检测电路，可变负载和控制放大器。 主放大器被配置为放大输入信号以产生输出信号。 电流感测电路耦合到主放大器，并且被配置为产生与流过主放大器的电流相关的感测电流。 可变负载经由节点耦合到电流镜，其中感测的电流流过节点和可变负载。 控制放大器耦合到节点和主放大器，并且被配置为接收节点的控制电压和电压以产生调节信号以控制主放大器的增益，其中可变负载的电阻具有 与控制电压的非线性关系。
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