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    Apparatus and methods for improving common mode rejection ratio
    3.
    发明授权
    Apparatus and methods for improving common mode rejection ratio 有权
    提高共模抑制比的装置和方法

    公开(公告)号：US09264002B2

    公开(公告)日：2016-02-16

    申请号：US14184555

    申请日：2014-02-19

    申请人： ANALOG DEVICES GLOBAL

    发明人： Jinhua Ni ,  Dan Li

    IPC分类号： H03F3/45

    CPC分类号： H03F3/45479 ,  H03F3/187 ,  H03F3/2173 ,  H03F3/45475 ,  H03F3/45932 ,  H03F3/45991 ,  H03F2200/129 ,  H03F2203/45112 ,  H03F2203/45528

    摘要： In certain applications, differential amplifiers with infinite common mode rejection ratios are desirable. However, resistance mismatches due to imperfections in the manufacturing create finite common mode rejection ratio in differential amplifiers degrading their performance. Disclosed are apparatus and method for improving the common mode rejection ratio of practical differential amplifiers.

    摘要翻译： 在某些应用中，具有无限共模抑制比的差分放大器是理想的。 然而，由于制造过程中的缺陷导致的电阻不匹配会导致差分放大器中的有限共模抑制比降低其性能。 公开了用于提高实际差分放大器的共模抑制比的装置和方法。

    Balanced amplifier and filter using the same
    5.
    发明授权
    Balanced amplifier and filter using the same 失效
    平衡放大器和滤波器使用相同

    公开(公告)号：US06876256B2

    公开(公告)日：2005-04-05

    申请号：US10790110

    申请日：2004-03-02

    申请人： Takeshi Ueno ,  Tetsuro Itakura ,  Krystyma Czarnul

    发明人： Zdzislaw Czarnul

    IPC分类号： H03F3/45 ,  H03H11/04

    CPC分类号： H03F3/211 ,  H03F3/45475 ,  H03F3/45632 ,  H03F3/45766 ,  H03F3/45928 ,  H03F3/45991 ,  H03F2203/45138 ,  H03H11/045 ,  H03H11/32

    摘要： A balanced amplifier comprising a pair of voltage-to-current converters including a first input terminal, a second input terminal, a first output terminal and a second output terminal to convert an input voltage applied to the first input terminal into an output current output from each of the first output terminal and the second output terminal, the second input terminal and the second output terminal of one of the converters being connected to the second input terminal and the second output terminal of the other of the converters to cancel common-mode components each other and extract differential-mode components.

    摘要翻译： 一种平衡放大器，包括一对电压 - 电流转换器，包括第一输入端子，第二输入端子，第一输出端子和第二输出端子，用于将施加到第一输入端子的输入电压转换为从 第一输出端子和第二输出端子，其中一个转换器的第二输入端子和第二输出端子连接到另一个转换器的第二输入端子和第二输出端子，以抵消共模元件 并提取差分模式组件。

    Monolithic I.C. implemented calibration circuit
    7.
    发明授权
    Monolithic I.C. implemented calibration circuit 有权
    整体式 实现校准电路

    公开(公告)号：US06718816B2

    公开(公告)日：2004-04-13

    申请号：US10390696

    申请日：2003-03-19

    申请人： Thomas A. Freehill ,  Timothy B. Straw

    发明人： Thomas A. Freehill ,  Timothy B. Straw

    IPC分类号： G01D1800

    CPC分类号： G01H3/005 ,  G01N29/30 ,  G01N29/34 ,  G01N29/36 ,  G01V13/00 ,  H03F3/45991 ,  H03F2203/45048

    摘要： The calibration circuit is used with a differential input, monolithic integrated circuit preamplifier in a sensor system. The calibration circuit tests the integrity of the sensor, the preamplifier, and the wiring in the sensor system. The calibration circuit includes first and second calibration capacitors having different capacitances connected to the preamplifier input leads. A calibration signal source is connected between the capacitors. The capacitors are preferably implemented on the same integrated circuit as the preamplifier. In operation, a calibration signal of known amplitude is applied to the calibration circuit and the level at the preamplifier output is determined. The level at the preamplifier output indicates certain conditions relating to the integrity of the sensor and its wiring, for example, an open circuit condition or a short circuit condition.

    摘要翻译： 校准电路与传感器系统中的差分输入单片集成电路前置放大器一起使用。 校准电路测试传感器系统的传感器，前置放大器和接线的完整性。 校准电路包括具有连接到前置放大器输入引线的不同电容的第一和第二校准电容器。 校准信号源连接在电容器之间。 电容器优选地在与前置放大器相同的集成电路上实现。 在操作中，将已知幅度的校准信号施加到校准电路，并且确定前置放大器输出端的电平。 前置放大器输出端的电平表示与传感器及其接线完整性有关的某些条件，例如开路状况或短路状况。

    Powered transducer preamplifier with DC level shifting circuit
    8.
    发明授权
    Powered transducer preamplifier with DC level shifting circuit 失效
    具有直流电平移位电路的电源传感器前置放大器

    公开(公告)号：US06577187B1

    公开(公告)日：2003-06-10

    申请号：US09594664

    申请日：2000-06-15

    申请人： Matthew M. Lesko

    发明人： Matthew M. Lesko

    IPC分类号： H03F2100

    CPC分类号： H03F3/45085 ,  H03F1/30 ,  H03F3/45475 ,  H03F3/45959 ,  H03F3/45991 ,  H03F2203/45371 ,  H03F2203/45591 ,  H03F2203/45688

    摘要： A powered transducer preamplifier includes a preamplifier circuit that DC couples the preamplifier input with the preamplifier output. A biasing circuit is coupled to the preamplifier input to apply a bias voltage to power the transducer, and a DC level shifting circuit is DC coupled to the signal path of the preamplifier circuit between the input and the output to compensate for this bias voltage. The DC level shifting circuit avoids the use of reactive components, and thereby reduces phase distortion. A variety of DC level shifting circuits can be used, including a bridge circuit having four matched resistors and an inverter DC coupled between the nodes of the bridge.

    摘要翻译： 一个供电的传感器前置放大器包括前置放大器电路，其将前置放大器输入端与前置放大器输出相耦合。 偏置电路耦合到前置放大器输入以施加偏置电压来为换能器供电，并且直流电平移位电路被直流耦合到输入和输出之间的前置放大器电路的信号路径，以补偿该偏置电压。 DC电平移位电路避免使用无功分量，从而减少相位失真。 可以使用各种DC电平移位电路，包括具有四个匹配电阻器的桥式电路和耦合在桥接器节点之间的逆变器DC。

    Amplifier circuit
    9.
    发明授权
    Amplifier circuit 有权
    放大器电路

    公开(公告)号：US06320466B1

    公开(公告)日：2001-11-20

    申请号：US09436571

    申请日：1999-11-09

    申请人： Fumio Meno

    发明人： Fumio Meno

    IPC分类号： H03F345

    CPC分类号： G01R33/09 ,  G11B5/02 ,  G11B5/40 ,  G11B2005/0016 ,  H03F3/45991

    摘要： The object of the invention is to realize an MR amplifier circuit that is operable with a single power supply voltage, and in which the CMRR can be maintained large. Current supply circuit (10) supplies a prescribed current (IB) to MR element (20) in response to a control signal (SD), the current of resistive element (R2) that is connected between node (ND2) and ground potential is set by means of the equivalent current circuit (40), the current that flows in resistive element (R2) is controlled in response to potential changes of node (ND2) when a noise is applied to MR element (20), and current changes of MR element (20) are suppressed. Due to the fact that a voltage drop that is generated in MR element (20) is amplified by amplifier (30) that is operated with a single power supply voltage, and since the resistance changes of MR element (20) accompanying changes in the magnetic field are detected, an amplifier circuit can be realized wherein the strength of the magnetic field can be detected, the CMRR can be kept high, and the effects due to in-phase noise can be minimized.

    摘要翻译： 本发明的目的是实现一种可用单个电源电压工作的MR放大器电路，其中CMRR可以维持较大。 电流供应电路（10）响应于控制信号（SD）向MR元件（20）提供规定的电流（IB），设置连接在节点（ND2）和地电位之间的电阻元件（R2）的电流 通过等效电流电路（40），当对MR元件（20）施加噪声时，响应于节点（ND2）的电位变化，电流元件（R2）中流动的电流被控制，并且MR的电流变化 元件（20）被抑制。 由于在MR元件（20）中产生的电压降由放大器（30）放大，由放电器（30）以单个电源电压工作，并且由于伴随磁性变化的MR元件（20）的电阻变化 可以实现能够检测磁场强度的放大器电路，可以将CMRR保持为高，并且由于同相噪声引起的影响可以最小化。

    Dynamic transducer biasing signal amplifying circuitry
    10.
    发明授权
    Dynamic transducer biasing signal amplifying circuitry 失效
    动态传感器偏置信号放大电路

    公开(公告)号：US4050086A

    公开(公告)日：1977-09-20

    申请号：US684053

    申请日：1976-05-06

    申请人： Jerome Danforth Harr

    发明人： Jerome Danforth Harr

    IPC分类号： G11B5/02 ,  G11B5/03 ,  H03F3/45 ,  H03G3/20

    CPC分类号： H03G3/3005 ,  G11B5/03 ,  H03F3/45973 ,  H03F3/45991

    摘要： The ideal response expected of an electromagnetic transducer, particularly of the Magneto-Resistive (M-R) type, obtains with signal translating circuitry for amplifying the varying signal produced and for dynamically biasing the transducer for maintaining the transducing operation in the linear portions of the characteristics of both the transducer and the amplifying circuitry. An M-R transducer is connected to the input circuit of alternating signal differential amplifying circuitry for delivering the desired signal at output terminals. The offset voltage across the transducer is compensated by differentially biasing input transistors of the amplifying circuitry. Biasing direct current through and/or voltage across the M-R transducer is controlled by a circuit connected to the output terminal and responsive to the signal thereat for developing a slowly inversely varying unidirectional voltage, preferably within a low pass filter interposed in the control circuit for stability. A current handling device, conveniently a transistor having the control voltage applied to a base electrode, is connected in series with the transducer for dynamically adjusting the unidirectional biasing current flowing therethrough.

    摘要翻译： 电磁换能器，特别是磁电阻（MR）型的理想响应是通过信号转换电路获得的，用于放大所产生的变化信号并用于动态地偏置换能器，以将转换操作保持在线性部分的特性 换能器和放大电路。 M-R传感器连接到交流信号差分放大电路的输入电路，用于在输出端传送所需的信号。 通过对放大电路的输入晶体管进行差分偏置来补偿传感器两端的偏移电压。 跨越MR换能器的直流电流和/或电压的偏置由连接到输出端子的电路控制，并响应于该信号，以产生缓慢逆向变化的单向电压，优选在插入控制电路中的低通滤波器内，以稳定 。 电流处理装置，方便地是具有施加到基极的控制电压的晶体管与换能器串联连接，用于动态地调节流过其中的单向偏置电流。