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公开(公告)号：US11223323B2
公开(公告)日：2022-01-11
申请号：US16948542
申请日：2020-09-23
摘要： Multi-level envelope tracking systems with separate DC and AC paths are provided. In certain embodiments, an envelope tracking system for generating a power amplifier supply voltage for a power amplifier is provided. The envelope tracking system includes a multi-level supply (MLS) DC-to-DC converter that outputs multiple regulated voltages, an MLS modulator that controls selection of the regulated voltages over time based on an envelope signal corresponding to an envelope of a radio frequency (RF) signal amplified by the power amplifier, an AC path filter coupled between an output of the MLS modulator and the power amplifier supply voltage, and a DC path filter coupled between a DC voltage and the power amplifier supply voltage.
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公开(公告)号：US11218116B2
公开(公告)日：2022-01-04
申请号：US17060873
申请日：2020-10-01
发明人： Wendy Ng , James Jason LoCascio
摘要： A power management integrated circuit (PMIC) can improve the ramp up speed of a boost converter with the inclusion of a controllable switch that may modify the connection of an output capacitor to reduce the ramp time as the output voltage is ramping to a desired boost setpoint. The switch may be controlled using jump start logic to switch a first plate or terminal of the output capacitor from a ground connection to a voltage supply connection. Once a threshold voltage is reached, the first plate of the capacitor may be switched from the supply voltage to ground. The PMIC may further include a quick start assembly that can drive the boost converter at a high duty-cycle.
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公开(公告)号：US20210409062A1
公开(公告)日：2021-12-30
申请号：US17225131
申请日：2021-04-08
发明人： Naoya MATSUMOTO
摘要： A radio-frequency module includes a module substrate, a power amplifier, and a control circuit configured to control the power amplifier. The control circuit includes a temperature sensor. The power amplifier and the control circuit are stacked one on top of another on a principal surface of the module substrate.
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公开(公告)号：US20210399696A1
公开(公告)日：2021-12-23
申请号：US17296457
申请日：2019-10-22
发明人： Jiaying SONG , Yifan JIANG
摘要： The invention discloses a nonlinear feedback circuit, which includes at least one diode. The invention also discloses a low noise amplifier using the nonlinear feedback circuit. In the invention, temperature compensation is performed for the gain change of the low noise amplifier based on the negative temperature characteristics of the diode, thereby achieving gain stability. In addition, the nonlinear characteristics of the diode can also provide high-order harmonics for the low-noise amplifier, and the mutual cancellation and addition of high-order harmonics can increase the OIP3 of the low noise amplifier.
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公开(公告)号：US11196392B2
公开(公告)日：2021-12-07
申请号：US16834049
申请日：2020-03-30
申请人： Qorvo US, Inc.
发明人： Baker Scott , George Maxim , Chong Woo
IPC分类号： H03F1/30
摘要： A device having device function circuitry configured to receive a device signal and output a modified device signal is disclosed. The device includes a device temperature sensor configured to generate a device temperature signal that is proportional to a temperature of the device function circuitry. The device function circuitry is further configured to maintain power dissipation of the device function circuitry to below a predetermined safe power dissipation level in response to a control signal that is generated based upon the device temperature signal.
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公开(公告)号：US11196389B2
公开(公告)日：2021-12-07
申请号：US16804139
申请日：2020-02-28
发明人： Yi-Chun Hsieh
摘要： A variable gain amplifier device includes a variable gain amplifier circuitry and a control voltage generating circuitry. The variable gain amplifier circuitry is configured to amplify input signals to generate output signals, wherein the variable gain amplifier circuitry includes a gain setting circuit that is configured to set a gain of the variable gain amplifier circuitry according to a control voltage. The control voltage generation circuitry is configured to simulate at least one circuit portion of the variable gain amplifier circuitry, in order to generate the control voltage according to the input signals and a setting voltage.
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公开(公告)号：US11188106B2
公开(公告)日：2021-11-30
申请号：US16744027
申请日：2020-01-15
申请人： pSemi Corporation
摘要： An apparatus for generating a steady state positive voltage (PVS) signal and a steady state negative voltage (NVS) signal is presented. The apparatus includes a bias signal generation module for generating a steady state reference voltage signal (RVS) based on a varying supply voltage signal (VDD), the RVS having a voltage level less than the PVS. The apparatus further includes a positive signal generation module (PSGM) generating the PVS, the PSGM including a first capacitor, the PSGM employing the first capacitor to generate a portion of the PVS based on the RVS. The apparatus further includes a negative signal generation module (NSGM) generating the NVS, the NSGM including a second capacitor, the NSGM employing the second capacitor to generate a portion of the NVS based on the RVS.
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公开(公告)号：US11177776B2
公开(公告)日：2021-11-16
申请号：US16654527
申请日：2019-10-16
发明人： Jong Ok Ha , Byeong Hak Jo , Jeong Hoon Kim , Young Wong Jang , Shinichi Iizuka
摘要： A bias timing control circuit includes a current source, a bias switch circuit, a duty cycle sensing circuit, and a switching control circuit. The bias switch circuit includes a first path switch, connected between an output node of the current source and a bias amplifying circuit, and a second path switch, connected between the output node of the current source and a temperature compensation circuit. The duty cycle sensing circuit is configured to generate a timing control signal based on a duty cycle of a transmission enable signal. The switching control circuit is configured to control a first turn-on time of the first path switch during an initial startup period, and a second turn-on time of the second path switch during a normal driving period subsequent to the initial startup period to adjust a warm-up time of a power amplifying circuit based on the timing control signal.
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公开(公告)号：US11177772B2
公开(公告)日：2021-11-16
申请号：US16590371
申请日：2019-10-01
发明人： Qiang Su , Zhenfei Peng , Baiming Xu , Jiangtao Yi
摘要： A power control circuit includes: a voltage-current converter and a programmable current amplifier; the voltage-current converter is configured to detect an inputted output power control signal, and to convert the output power control signal to a control current and output same; and the programmable current amplifier is configured to receive the control current and output the amplified control current as a bias current of the power amplifier connected to the power control circuit.
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公开(公告)号：US11164963B2
公开(公告)日：2021-11-02
申请号：US16854262
申请日：2020-04-21
发明人： Isao Obu , Yasunari Umemoto , Masahiro Shibata , Shigeki Koya , Masao Kondo , Takayuki Tsutsui
IPC分类号： H01L29/737 , H03F3/21 , H03F1/56 , H03F3/24 , H01L29/08 , H01L23/00 , H01L29/10 , H01L29/417 , H01L29/423 , H01L21/306 , H01L21/02 , H01L21/311 , H01L21/308 , H01L29/66 , H03F3/213 , H03F3/195 , H01L29/205 , H01L29/45 , H03F1/30 , H01L27/102 , H01L21/285
摘要： A bipolar transistor includes a collector layer, a base layer, and an emitter layer that are formed in this order on a compound semiconductor substrate. The emitter layer is disposed inside an edge of the base layer in plan view. A base electrode is disposed on partial regions of the emitter layer and the base layer so as to extend from an inside of the emitter layer to an outside of the base layer in plan view. An insulating film is disposed between the base electrode and a portion of the base layer, with the portion not overlapping the emitter layer. An alloy layer extends from the base electrode through the emitter layer in a thickness direction and reaches the base layer. The alloy layer contains at least one element constituting the base electrode and elements constituting the emitter layer and the base layer.
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