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    CHOPPER-STABILIZED AMPLIFIER
    2.
    发明公开
    CHOPPER-STABILIZED AMPLIFIER 审中-公开

    公开(公告)号：US20240313719A1

    公开(公告)日：2024-09-19

    申请号：US18185441

    申请日：2023-03-17

    Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC

    Inventor： Cornel D. STANESCU ,  Adrian Constantin VESELU

    IPC: H03F3/393 ,  G01R19/00 ,  H03F3/45

    CPC classification number: H03F3/393 ,  G01R19/0023 ,  H03F3/45475 ,  H03F2203/45248

    Abstract: A high-voltage chopper-stabilized amplifier can include two paths to compensate for non-ideal electrical parameters. A first path, leading to a primary input of the amplifier, may include a first mux interface circuit to limit voltages at the primary input of the amplifier. A second path, leading to an auxiliary input of the amplifier, may include a chopper amplifier circuit. Despite the first mux interface circuit, a slew condition on the first path may excite a current in the second path that can negatively affect the signal source. Accordingly, the disclosed amplifier further includes a second mux interface circuit that can decouple the second path while a slew condition. The second mux interface circuit is driven by a window floating comparator, which is supplied according to the voltages on primary input. A settling enhancer circuit keeps, during slew condition, certain nodes on the second path at a reference voltage.

    TRIMMING METHOD FOR CURRENT SENSE AMPLIFIERS
    3.
    发明申请
    TRIMMING METHOD FOR CURRENT SENSE AMPLIFIERS 有权
    电流检测放大器的测量方法

    公开(公告)号：US20160173037A1

    公开(公告)日：2016-06-16

    申请号：US14967529

    申请日：2015-12-14

    Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC

    Inventor： Razvan PUSCASU ,  Cornel D. STANESCU ,  Laurentiu O. CREOSTEANU ,  Pavel BRINZOI

    IPC: H03F1/02 ,  H03F3/45

    CPC classification number: H03F3/45748 ,  G01R1/203 ,  G01R19/0092 ,  H03F1/0205 ,  H03F1/523 ,  H03F3/211 ,  H03F3/45 ,  H03F3/45179 ,  H03F3/45273 ,  H03F3/45381 ,  H03F3/45479 ,  H03F2200/261 ,  H03F2200/444 ,  H03F2200/462 ,  H03F2203/45116 ,  H03F2203/45118 ,  H03F2203/45528 ,  H03F2203/45571 ,  H03F2203/45594 ,  H03F2203/45674

    Abstract: A method for adjusting common mode rejection ratio (CMRR) and gain error of a current sense (CS) amplifier, comprising: measuring a first referred to input (RTI) offset voltage while presenting a given common mode (CM) input voltage; adding a first trim resistor of a plurality of selectable trim resistors within an adjustable feedback resistor chain to a feedback electrical path; measuring a second RTI offset voltage while presenting the given CM input voltage; estimating, based upon the first and second RTI offset voltages, a third RTI offset voltage value that would result by adding a second trim resistor of the plurality of selectable trim resistors to the feedback electrical path; using the first, second and third RTI offset voltage values to identify the combination of selectable trim resistors that achieves an RTI offset voltage closest to zero volts; and adding the identified selectable trim resistors to the feedback electrical path.

    Abstract translation: 一种用于调节电流检测（CS）放大器的共模抑制比（CMRR）和增益误差的方法，包括：在呈现给定共模（CM）输入电压的同时测量第一参考输入（RTI）偏移电压; 将多个可选修整电阻器的第一微调电阻器添加到可调反馈电阻器链中到反馈电路径; 在呈现给定CM输入电压的同时测量第二RTI偏移电压; 基于所述第一和第二RTI偏移电压估计将通过将所述多个可选修整电阻器的第二调整电阻器添加到所述反馈电路径而产生的第三RTI偏移电压值; 使用第一，第二和第三RTI偏移电压值来识别实现最接近零伏的RTI偏移电压的可选择的微调电阻器的组合; 并将所识别的可选修整电阻器添加到反馈电路径。

    DIFFERENTIAL OPERATIONAL TRANSCONDUCTANCE AMPLIFIER FOR CHOPPER-STABILIZED AMPLIFICATION
    4.
    发明申请
    DIFFERENTIAL OPERATIONAL TRANSCONDUCTANCE AMPLIFIER FOR CHOPPER-STABILIZED AMPLIFICATION 有权

    公开(公告)号：US20220069789A1

    公开(公告)日：2022-03-03

    申请号：US17304132

    申请日：2021-06-15

    Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC

    Inventor： Cornel D. STANESCU

    IPC: H03F3/45 ,  H03F3/393

    Abstract: A differential operational transconductance amplifier, or DOTA, intended to be used in zero-drift precision operational amplifiers as chopper amplifier stage is disclosed. The DOTA is configured to function with a low-voltage power supply and to have good performance based on circuitry configured to provide a constant gain over a range of common-mode voltages, or VCM. The DOTA further includes bias circuitry configured to respond to the common mode voltage in order to prevent large currents, which can result from the constant gain circuitry, from negatively affecting performance. The DOTA further includes current sources that are configured to prevent temperature variations from negatively affecting performance. The DOTA further includes VCM-driven bias voltages used to optimize the operating point of the differential output stage. The DOTA uses input and input replica transistors having medium threshold voltage, which results in capability to operate at low supply voltages.

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