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公开(公告)号：US20200336122A1
公开(公告)日：2020-10-22
申请号：US16802935
申请日：2020-02-27
发明人： Yu-Jui Lin , Wei Zhang , David Steven Ripley , Vignesh Sridharan
摘要： Envelope tracking power amplifiers with advanced gain shaping are provided. In certain implementations, a power amplifier system includes a power amplifier that amplifies a radio frequency (RF) signal and an envelope tracker that controls a voltage level of a supply voltage of the power amplifier based on an envelope of the RF signal. The power amplifier system further includes a gain shaping circuit that generates a gain shaping current that changes with the voltage level of the supply voltage from the envelope tracker. For example, the gain shaping circuit can include an analog look-up table (LUT) mapping a particular voltage level of the supply voltage to a particular current level of gain shaping current. Additionally, the gain shaping circuit biases the power amplifier based on the gain shaping current.
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公开(公告)号：US20230299732A1
公开(公告)日：2023-09-21
申请号：US18324585
申请日：2023-05-26
发明人： Yu-Jui Lin , Wei Zhang , David Steven Ripley , Vignesh Sridharan
CPC分类号： H03G3/3042 , H03F3/245 , H03F1/0233 , H04B1/40 , H03G2201/307 , H03F2200/105 , H03F2200/451 , H03G2201/103
摘要： Envelope tracking power amplifiers with advanced gain shaping are provided. In certain implementations, a power amplifier system includes a power amplifier that amplifies a radio frequency (RF) signal and an envelope tracker that controls a voltage level of a supply voltage of the power amplifier based on an envelope of the RF signal. The power amplifier system further includes a gain shaping circuit that generates a gain shaping current that changes with the voltage level of the supply voltage from the envelope tracker. For example, the gain shaping circuit can include an analog look-up table (LUT) mapping a particular voltage level of the supply voltage to a particular current level of gain shaping current. Additionally, the gain shaping circuit biases the power amplifier based on the gain shaping current.
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公开(公告)号：US11705877B2
公开(公告)日：2023-07-18
申请号：US17305111
申请日：2021-06-30
发明人： Yu-Jui Lin , Wei Zhang , David Steven Ripley , Vignesh Sridharan
CPC分类号： H03G3/3042 , H03F1/0233 , H03F3/245 , H04B1/40 , H03F2200/105 , H03F2200/451 , H03G2201/103 , H03G2201/307
摘要： Envelope tracking power amplifiers with advanced gain shaping are provided. In certain implementations, a power amplifier system includes a power amplifier that amplifies a radio frequency (RF) signal and an envelope tracker that controls a voltage level of a supply voltage of the power amplifier based on an envelope of the RF signal. The power amplifier system further includes a gain shaping circuit that generates a gain shaping current that changes with the voltage level of the supply voltage from the envelope tracker. For example, the gain shaping circuit can include an analog look-up table (LUT) mapping a particular voltage level of the supply voltage to a particular current level of gain shaping current. Additionally, the gain shaping circuit biases the power amplifier based on the gain shaping current.
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公开(公告)号：US20210384880A1
公开(公告)日：2021-12-09
申请号：US17305111
申请日：2021-06-30
发明人： Yu-Jui Lin , Wei Zhang , David Steven Ripley , Vignesh Sridharan
摘要： Envelope tracking power amplifiers with advanced gain shaping are provided. In certain implementations, a power amplifier system includes a power amplifier that amplifies a radio frequency (RF) signal and an envelope tracker that controls a voltage level of a supply voltage of the power amplifier based on an envelope of the RF signal. The power amplifier system further includes a gain shaping circuit that generates a gain shaping current that changes with the voltage level of the supply voltage from the envelope tracker. For example, the gain shaping circuit can include an analog look-up table (LUT) mapping a particular voltage level of the supply voltage to a particular current level of gain shaping current. Additionally, the gain shaping circuit biases the power amplifier based on the gain shaping current.
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公开(公告)号：US11646701B2
公开(公告)日：2023-05-09
申请号：US17176103
申请日：2021-02-15
CPC分类号： H03F1/52 , H03F1/0211 , H03F3/213 , H03F2200/387 , H03F2200/426 , H03F2200/451
摘要： A power amplification system comprises a current source configured to provide a bias current, a current mirror configured to mirror the bias current, and a comparator configured to compare the mirrored bias current to a threshold current and, in response to the mirrored bias current exceeding the threshold current, cause a reduction of output power.
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公开(公告)号：US11082021B2
公开(公告)日：2021-08-03
申请号：US16802935
申请日：2020-02-27
发明人： Yu-Jui Lin , Wei Zhang , David Steven Ripley , Vignesh Sridharan
摘要： Envelope tracking power amplifiers with advanced gain shaping are provided. In certain implementations, a power amplifier system includes a power amplifier that amplifies a radio frequency (RF) signal and an envelope tracker that controls a voltage level of a supply voltage of the power amplifier based on an envelope of the RF signal. The power amplifier system further includes a gain shaping circuit that generates a gain shaping current that changes with the voltage level of the supply voltage from the envelope tracker. For example, the gain shaping circuit can include an analog look-up table (LUT) mapping a particular voltage level of the supply voltage to a particular current level of gain shaping current. Additionally, the gain shaping circuit biases the power amplifier based on the gain shaping current.
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公开(公告)号：US10951178B2
公开(公告)日：2021-03-16
申请号：US16586711
申请日：2019-09-27
摘要： In some embodiments, a power amplification system can comprise a current source configured to provide a bias current, a current mirror configured to mirror the bias current, a comparator configured to compare the mirrored bias current to a threshold current, and a transistor at an output of the comparator. The transistor can be configured to be activated in response to the mirrored bias current exceeding the threshold current.
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