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公开(公告)号：US20250070727A1
公开(公告)日：2025-02-27
申请号：US18795856
申请日：2024-08-06
Applicant: Analog Devices, Inc.
Inventor： Petrus M. Stroet
Abstract: Apparatus and methods for preventing overshoot for a high-to-low input current transient of a logarithmic transimpedance amplifier are disclosed. In certain embodiments, an amplifier system includes a logarithmic transimpedance amplifier having an input that receives an input current signal, and a current pulse injection circuit that injects a current pulse into the input of the logarithmic transimpedance amplifier in response to detecting a transition of the input current signal from a high current value to a low current value.
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公开(公告)号：US20240396505A1
公开(公告)日：2024-11-28
申请号：US18471540
申请日：2023-09-21
Applicant: Texas Instruments Incorporated
Inventor： Divya Kaur
Abstract: Techniques for providing amplifier overdrive protection. In an example, a circuit configured to determine the difference between the amplifier output voltage and the amplifier power supply voltage, so as to sense an overdrive condition. Responsive to the difference exceeding a threshold, the circuit is configured to limit the amplifier drive capability, which in turn limits the maximum amplifier output current. The circuit may restore the amplifier drive capability, responsive to cessation of the overdrive condition. In some such cases, the circuit may be configured with hysteresis, so as to provide stability when transitioning to and from the reduced drive state. Another example circuit operates in a similar fashion but is configured to determine the difference between the amplifier input voltage and a reference voltage, so as to sense an overdrive condition. In some such cases, the reference voltage may be equal to amplifier power supply voltage divided by amplifier gain.
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公开(公告)号：US20240380368A1
公开(公告)日：2024-11-14
申请号：US18783826
申请日：2024-07-25
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Yoshifumi TAKAHASHI
Abstract: There is provided a limiter circuit and a power amplifier circuit that are capable of effectively limiting output power of an amplifying transistor based on the amplitude of an input signal. A limiter circuit is connectable to an amplifying transistor that amplifies and outputs a radio frequency signal and controls a voltage to be applied to the amplifying transistor, based on the radio frequency signal. The limiter circuit includes an input signal detection transistor that detects power of the radio frequency signal and a voltage limiting transistor that limits the voltage to be applied to the amplifying transistor, based on current flowing to the input signal detection transistor.
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4.发明授权
公开(公告)号：US12132452B2
公开(公告)日：2024-10-29
申请号：US16946090
申请日：2020-06-05
Applicant: Analog Devices, Inc.
Inventor： Arthur J. Kalb , Yoshinori Kusuda
CPC classification number: H03F1/52 , H02H3/20 , H02M1/32 , H03F2200/441
Abstract: Apparatus and methods for amplifier input-overvoltage protection with low leakage current are provided herein. In certain embodiments, amplifier input circuitry for an amplifier includes a pair of input terminals, a pair of input transistors each having a control input (for instance, a transistor gate), a pair of protection transistors each connected between one of the input terminals and the control input of a corresponding one of the input transistors, and a bidirectional clamp connected between the control inputs of the input transistors. Implementing the amplifier input circuitry in this manner provides a number of advantages including, but not limited to, robust protection against input overvoltage and low input-leakage current.
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公开(公告)号：US20240347529A1
公开(公告)日：2024-10-17
申请号：US18574986
申请日：2022-02-15
Applicant: SONY SEMICONDUCTOR SOLUTIONS CORPORATION
Inventor： TOMOYA NISHIDA , YOSHIKAZU MOTOYAMA , HIDEAKI FUTAI
IPC: H01L27/02 , H01L27/088 , H01L29/778 , H03F1/52 , H03F3/195 , H03F3/24
CPC classification number: H01L27/0266 , H01L27/0883 , H01L29/7786 , H03F1/523 , H03F3/195 , H03F3/245 , H03F2200/451
Abstract: A protection circuit includes a first insulated gate field-effect transistor in which: a first main electrode is coupled between an external terminal and an internal circuit; a second main electrode and a gate electrode are coupled to a reference power supply; and an electric charge accumulation section configured to accumulate hot carriers is provided in a gate insulating film.
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公开(公告)号：US20240291442A1
公开(公告)日：2024-08-29
申请号：US18655725
申请日：2024-05-06
Applicant: Murata Manufacturing Co., Ltd.
Inventor： Shingo YANAGIHARA
CPC classification number: H03F1/52 , H03F1/565 , H03F3/21 , H03F2200/387 , H03F2200/426
Abstract: A limiter circuit includes: one or a plurality of first diodes having an anode electrically connected to a signal line through which a high-frequency signal passes, and a cathode electrically connected to a node, the plurality of first diodes being connected in series; a transistor having a source-drain path or an emitter-collector path electrically connected between a reference potential and the node, and a gate or a base to which a control voltage or a control current is input; and a first constant current source that outputs a first constant current to the node.
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公开(公告)号：US20240250652A1
公开(公告)日：2024-07-25
申请号：US18564280
申请日：2022-08-02
Applicant: SHANGHAI MEICON INTELLIGENT CONSTRUCTION CO., LTD. , GD MIDEA HEATING & VENTILATING EQUIPMENT CO., LTD.
Inventor： Zhen ZHAO , Dayou YANG , Jie YAN
CPC classification number: H03F3/45475 , H03F1/52 , H03F2200/261 , H03F2203/45138
Abstract: An output control circuit, a controller, and an air conditioner are provided. The output control circuit includes a signal input end, a first amplification module, a first power module, a first resistor, a second amplification module, a switch module, and a signal output end. A first input end of the first amplification module is connected to the signal input end. A first input end of the first power module is connected to an output end of the first amplification module and a second input end is connected to a first direct-current voltage source. A first end of the first resistor is connected to an output end of the first power module. A first input end of the second amplification module is connected to the first end of the first resistor and a second input end is connected to a second end of the first resistor.
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8.发明公开
公开(公告)号：US20240213930A1
公开(公告)日：2024-06-27
申请号：US18216574
申请日：2023-06-29
Applicant: Samsung Electro-Mechanics Co., Ltd.
Inventor： Youngwong JANG , Jeonghoon KIM , Shinichi IIZUKA , Jongok HA , Hyejin LEE
CPC classification number: H03F1/523 , H02H7/008 , H03F3/21 , H03F2200/451 , H03F2203/21127
Abstract: An overcurrent protection circuit includes a variable voltage source configured to generate a first voltage which that in response to a variable current; an amplifier comprising a first input terminal to which the first voltage is applied; and a limit current source connected to a second input terminal of the amplifier and configured to generate a limit current corresponding to the first voltage.
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公开(公告)号：US20240204734A1
公开(公告)日：2024-06-20
申请号：US18476962
申请日：2023-09-28
Inventor： Rupesh KHARE , Mehul MISTRY , Gautham SATHYANARAYANAN
IPC: H03F1/52
CPC classification number: H03F1/523 , H03F3/45071 , H03F2200/441
Abstract: Circuitry for driving first and second loads, the circuitry comprising: a first output signal path for supplying a first driving signal to the first load; a second output signal path for supplying a second driving signal to the second load; sequencer circuitry configured to initiate a first state change in the first output signal path and a second state change in the second output signal path, wherein the sequencer circuitry is configured to control the initiation of the first and second state changes such that the second state change is not synchronised with the first state change.
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公开(公告)号：US11929717B2
公开(公告)日：2024-03-12
申请号：US17582338
申请日：2022-01-24
Applicant: TEXAS INSTRUMENTS INCORPORATED
CPC classification number: H03F1/303 , H03F1/52 , H03F3/005 , H03F3/45632
Abstract: An output stage of an operational amplifier includes a low voltage (LV) metal oxide semiconductor (MOS) device and a dynamic current limit circuit. An output current of the operational amplifier flows through the LV MOS device. The dynamic current limit circuit is configured to sense a drain voltage of the LV MOS device and increase a clamping voltage for the LV MOS device when the drain voltage of the LV MOS device is less than a threshold voltage.
