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公开(公告)号：US20190383861A1
公开(公告)日：2019-12-19
申请号：US16554248
申请日：2019-08-28
IPC分类号： G01R19/165 , G01R31/34 , G11C27/02 , H03F3/45
摘要： A circuit includes a switching circuit including a first switch and a second switch. A current sensing circuit is coupled to the switching circuit to sense a first current through the first switch and to generate a first sensed current signal based on the sensed first current, and configured to sense a second current through the second switch and to generate a second sensed current signal based on the sensed second current. An output circuit is coupled to the current sensing circuit and is configured to generate a failure signal based on the first sensed current signal and the second sensed current signal.
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公开(公告)号：US10215782B2
公开(公告)日：2019-02-26
申请号：US15372127
申请日：2016-12-07
IPC分类号： G01R19/165 , G11C27/02 , H03F3/45 , G01R31/34
摘要： A device measures the current in an inductive load using two separate current-measuring paths to detect the current in the inductive load. The inductive load is connected between first and second nodes, and the first node connected to a first voltage. The device includes first and second transistors cascaded together between the first node and a third node that is connected to a second voltage. First and second sense amplifiers measure the current in the inductive load. The first and second sense amplifiers are connected to at least one terminal of the first and second transistors. Two blocks sample and hold signals from the first and second sense amplifiers, which represent, respectively, the currents in the two separate current-measuring paths. The two currents are subtracted in a comparison node for generating an error signal that is compared with a predefined window and if outside the window a failure signal is generated.
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公开(公告)号：US20160204778A1
公开(公告)日：2016-07-14
申请号：US15076211
申请日：2016-03-21
IPC分类号： H03K17/16
CPC分类号： G05F3/02 , B06B1/0215 , H03K4/94 , H03K17/162
摘要： A transmission channel transmits high-voltage pulses and receives echos of the high-voltage pulses. The transmission channel includes a current generator circuit, which generates current-integrator drive currents. The control circuitry generates one or more control signals to control generation of current-integrator drive currents by the current generator circuit during transducer-driving periods. A current integrator integrates current-integrator drive currents generated by current generator circuit to generate transducer drive signals.
摘要翻译： 传输通道传输高电压脉冲并接收高电压脉冲的回波。 传输通道包括产生电流积分器驱动电流的电流发生器电路。 控制电路产生一个或多个控制信号，以在换能器驱动期间通过电流发生器电路来控制电流积分器驱动电流的产生。 电流积分器集成了由电流发生器电路产生的电流积分器驱动电流以产生换能器驱动信号。
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4.发明公开公开(公告)号：US20230308066A1
公开(公告)日：2023-09-28
申请号：US18180595
申请日：2023-03-08
CPC分类号： H03G3/30 , H03F3/04 , H03G2201/103
摘要： In accordance with an embodiment, a variable gain amplifier includes: a first differential transistor pair coupled to a signal input; a first current source configured to provide a first bias current to the first differential transistor pair; a pair of diodes coupled to an output of the first differential transistor pair; a second differential transistor pair having an input coupled to the pair of diodes; a second current source configured to provide a second bias current to the second differential transistor pair; and a current control circuit coupled to the first current source and the second current source.
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公开(公告)号：US10444264B2
公开(公告)日：2019-10-15
申请号：US16262521
申请日：2019-01-30
IPC分类号： G01R19/165 , G01R31/34 , H03F3/45 , G11C27/02
摘要： A device measures the current in an inductive load using two separate current-measuring paths to detect the current in the inductive load. The inductive load is connected between first and second nodes, and the first node connected to a first voltage. The device includes first and second transistors cascaded together between the first node and a third node that is connected to a second voltage. First and second sense amplifiers measure the current in the inductive load. The first and second sense amplifiers are connected to at least one terminal of the first and second transistors. Two blocks sample and hold signals from the first and second sense amplifiers, which represent, respectively, the currents in the two separate current-measuring paths. The two currents are subtracted in a comparison node for generating an error signal that is compared with a predefined window and if outside the window a failure signal is generated.
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6.发明申请RECEPTION AND TRANSMISSION CIRCUIT FOR A CAPACITIVE MICROMACHINED ULTRASONIC TRANSDUCER 审中-公开电容式微型超声波传感器的接收和传输电路公开(公告)号：US20160076933A1
公开(公告)日：2016-03-17
申请号：US14750312
申请日：2015-06-25
CPC分类号： G01H11/06 , B06B1/0207 , B06B2201/51 , B06B2201/76 , G01S7/52019 , G01S7/52023 , G10K11/18
摘要： Described herein is a transceiver circuit for a capacitive micromachined ultrasonic transducer (CMUT), provided with: a transmitter stage, which generates excitation pulses for a first node of the CMUT transducer during a transmitting phase, a second node of the CMUT transducer being coupled to a biasing voltage; a receiver stage that is selectively coupled to the first node during a receiving phase and has an amplification stage; a switching stage that couples the receiver stage to the first node during the receiving phase and decouples the receiver stage from the first node during the transmitting phase. The amplification stage is provided with a charge amplifier that has an input terminal and is biased as a function of a biasing voltage; and the switching stage is coupled to the same biasing voltage thereby minimizing an injection of charge into the input terminal upon switching from the transmitting phase to the receiving phase.
摘要翻译： 这里描述的是用于电容微加工超声换能器（CMUT）的收发器电路，其提供有：发射器级，其在发射阶段期间为CMUT换能器的第一节点产生激励脉冲，CMUT换能器的第二节点耦合到 偏置电压; 在接收阶段期间选择性地耦合到第一节点并具有放大级的接收机级; 切换阶段，在接收阶段将接收机级耦合到第一节点，并在发射阶段将接收机级与第一节点分离。 放大级具有电荷放大器，其具有输入端并作为偏置电压的函数被偏置; 并且开关级耦合到相同的偏置电压，从而在从发送阶段切换到接收阶段时最小化到输入端子中的电荷注入。
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公开(公告)号：US12130360B2
公开(公告)日：2024-10-29
申请号：US18178110
申请日：2023-03-03
CPC分类号： G01S15/931 , G01S7/521 , G01S7/524 , G01S2007/52007 , G01S2015/937 , H04R17/00
摘要： In accordance with an embodiment, an ultrasound transmitter device includes a transformer comprising a secondary winding configured to be coupled to a piezoelectric transducer; a plurality of transistors coupled to the primary winding of the transformer and to a ground terminal via a sense resistor; an amplifier having an output coupled to control nodes of the plurality of transistors, a first input coupled to the sense resistor, and second input coupled to a reference resistor; a switching circuit configured to alternately couple control nodes of the plurality of transistors to an output of amplifier and to a reference node via complementary pulse signals, wherein the switching circuit is configured to turn on and turn off the plurality of transistors and operate the plurality of transistors in a push-pull manner; and a digital-to-analog converter having an output coupled to the reference resistor.
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公开(公告)号：US11150279B2
公开(公告)日：2021-10-19
申请号：US16554248
申请日：2019-08-28
IPC分类号： G01R31/34 , G01R19/165 , G11C27/02 , H03F3/45
摘要： A circuit includes a switching circuit including a first switch and a second switch. A current sensing circuit is coupled to the switching circuit to sense a first current through the first switch and to generate a first sensed current signal based on the sensed first current, and configured to sense a second current through the second switch and to generate a second sensed current signal based on the sensed second current. An output circuit is coupled to the current sensing circuit and is configured to generate a failure signal based on the first sensed current signal and the second sensed current signal.
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公开(公告)号：US10114114B2
公开(公告)日：2018-10-30
申请号：US14669651
申请日：2015-03-26
摘要： An ultrasonic probe includes: an ultrasonic transducer; an amplification stage; a bias circuit, which determines a bias voltage on an input terminal of the amplification stage; and a selector having an intermediate node, a high-voltage switch between the intermediate node and the transducer, and a first low-voltage switch between the intermediate node and the input terminal. A control unit controls the high-voltage switch and the first low-voltage switch so as to alternately couple and decouple the amplification stage and the transducer. A precharge circuit determines a precharge voltage on the intermediate node as a function of the bias voltage, before the amplification stage and the transducer are coupled.
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公开(公告)号：US09772645B2
公开(公告)日：2017-09-26
申请号：US15076211
申请日：2016-03-21
CPC分类号： G05F3/02 , B06B1/0215 , H03K4/94 , H03K17/162
摘要： A transmission channel transmits high-voltage pulses and receives echos of the high-voltage pulses. The transmission channel includes a current generator circuit, which generates current-integrator drive currents. The control circuitry generates one or more control signals to control generation of current-integrator drive currents by the current generator circuit during transducer-driving periods. A current integrator integrates current-integrator drive currents generated by current generator circuit to generate transducer drive signals.
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