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公开(公告)号：US08648623B2
公开(公告)日：2014-02-11
申请号：US13448161
申请日：2012-04-16
IPC分类号： G01R19/00
CPC分类号： G01R19/0092 , G01R1/203 , H03F1/26 , H03F3/393 , H03F3/45179 , H03F3/45632 , H03F2200/261 , H03F2200/462 , H03F2200/481 , H03F2203/45548
摘要： A single stage current sense amplifier is described that generates a differential output that is proportional to a current through a sense resistor. The voltage across the sense resistor is Vsense. The current sense amplifier includes a differential transconductance amplifier having high impedance input terminals. An on-chip RC filter filters transients in the Vsense signal. A feedback circuit for each leg of the amplifier causes a pair of input transistors to conduct a fixed constant current irrespective of Vsense, which stabilizes the transconductance. A gain control resistor (Re) is coupled across terminals of the pair of input transistors and has Vsense across it. The current through the gain control resistor is therefore Vsensex1/Re. A level shifting circuit coupled to each of the input transistors lowers a common mode voltage at an output of the amplifier. Chopper circuits at the input and output cancel any offset voltages.
摘要翻译： 描述了单级电流检测放大器，其产生与通过检测电阻器的电流成比例的差分输出。 检测电阻两端的电压为Vsense。 电流检测放大器包括具有高阻抗输入端的差分跨导放大器。 片内RC滤波器对Vsense信号中的瞬变进行滤波。 放大器的每个支路的反馈电路使得一对输入晶体管能够导通固定的恒定电流，而与Vsense无关，这稳定跨导。 增益控制电阻（Re）耦合在该对输入晶体管的端子之间，并且在其上具有Vsense。 因此，通过增益控制电阻的电流为Vsensex1 / Re。 耦合到每个输入晶体管的电平移动电路在放大器的输出处降低共模电压。 输入和输出的斩波电路可以消除任何偏移电压。
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2.发明授权公开(公告)号：US07218171B1
公开(公告)日：2007-05-15
申请号：US11052104
申请日：2005-02-08
IPC分类号： H03F1/02
CPC分类号： H03F3/45977 , H03F1/304 , H03F2203/45048 , H03F2203/45136 , H03F2203/45588 , H03F2203/45681
摘要： Voltage offset of an integrated circuit amplifier is accurately determined for calibration of the device. Circuit connections are established between the integrated circuit and an external device, such as an IC handler. Internal noise gain resistors formed within the integrated circuit are connected by internal switches to the amplifier and the output voltage is measured so that a value of a voltage offset of the amplifier while the noise gain resistors are connected can be calculated. The use of internal noise gain resistors produces a voltage offset component of the output voltage that is significantly greater in magnitude than effects of thermocouple voltages generated by circuit junction connections.
摘要翻译： 准确地确定集成电路放大器的电压偏移量用于校准器件。 在集成电路和外部设备（如IC处理器）之间建立电路连接。 集成电路内部形成的内部噪声增益电阻由内部开关连接到放大器，并测量输出电压，以便连接噪声增益电阻时放大器的电压偏移值。 使用内部噪声增益电阻会产生输出电压的电压偏移分量，其幅度明显大于由电路结连接产生的热电偶电压的影响。
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公开(公告)号：US07443237B1
公开(公告)日：2008-10-28
申请号：US11445237
申请日：2006-06-02
申请人： Hengsheng Liu
发明人： Hengsheng Liu
IPC分类号： H03F3/45
CPC分类号： H03F3/45192 , H03F2203/45028 , H03F2203/45052 , H03F2203/45056 , H03F2203/45248 , H03F2203/45301 , H03F2203/45356
摘要： A folded cascode amplifier having improved slew comprises an input differential transistor pair circuit, a cascode branch circuit coupled to the differential pair circuit, and a boost circuit for increasing branch current when the amplifier is in a slew condition. The additional current increases slew of the amplifier without negatively affecting amplifier characteristics.
摘要翻译： 具有改进的转换的折叠共源共栅放大器包括输入差分晶体管对电路，耦合到差分对电路的共源共共分支电路和用于在放大器处于转换状态时增加分支电流的升压电路。 附加电流增加放大器的转换，而不会对放大器特性产生不利影响。
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公开(公告)号：US20130271216A1
公开(公告)日：2013-10-17
申请号：US13448161
申请日：2012-04-16
IPC分类号： H03F3/45
CPC分类号： G01R19/0092 , G01R1/203 , H03F1/26 , H03F3/393 , H03F3/45179 , H03F3/45632 , H03F2200/261 , H03F2200/462 , H03F2200/481 , H03F2203/45548
摘要： A single stage current sense amplifier is described that generates a differential output that is proportional to a current through a sense resistor. The voltage across the sense resistor is Vsense. The current sense amplifier includes a differential transconductance amplifier having high impedance input terminals. An on-chip RC filter filters transients in the Vsense signal. A feedback circuit for each leg of the amplifier causes a pair of input transistors to conduct a fixed constant current irrespective of Vsense, which stabilizes the transconductance. A gain control resistor (Re) is coupled across terminals of the pair of input transistors and has Vsense across it. The current through the gain control resistor is therefore Vsensex1/Re. A level shifting circuit coupled to each of the input transistors lowers a common mode voltage at an output of the amplifier. Chopper circuits at the input and output cancel any offset voltages.
摘要翻译： 描述了单级电流检测放大器，其产生与通过检测电阻器的电流成比例的差分输出。 检测电阻两端的电压为Vsense。 电流检测放大器包括具有高阻抗输入端的差分跨导放大器。 片内RC滤波器对Vsense信号中的瞬变进行滤波。 放大器的每个支路的反馈电路使得一对输入晶体管能够导通固定的恒定电流，而与Vsense无关，这稳定跨导。 增益控制电阻（Re）耦合在该对输入晶体管的端子之间，并且在其上具有Vsense。 因此，通过增益控制电阻的电流为Vsensex1 / Re。 耦合到每个输入晶体管的电平移动电路在放大器的输出处降低共模电压。 输入和输出的斩波电路可以消除任何偏移电压。
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公开(公告)号：US07548115B1
公开(公告)日：2009-06-16
申请号：US11524197
申请日：2006-09-21
申请人： Hengsheng Liu
发明人： Hengsheng Liu
IPC分类号： H03F3/45
CPC分类号： H03F3/45183 , H03F3/45717 , H03F2200/453 , H03F2203/45048 , H03F2203/45371 , H03F2203/45424
摘要： An operational amplifier circuit includes an input differential circuit and a trim circuit for sensing the operational amplifier's input common mode voltage and generating an offset correction voltage in response thereto. The trim circuit reduces the amplifier's offset voltage dependence on input common mode voltage, and hence improves the common mode rejection ratio of the operational amplifier circuit.
摘要翻译： 运算放大器电路包括输入差分电路和微调电路，用于感测运算放大器的输入共模电压并响应于此产生偏移校正电压。 微调电路减小了放大器的偏移电压与输入共模电压的关系，从而提高了运算放大器电路的共模抑制比。
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