利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

246 条记录 (耗时 0.015 秒)

    OFFSET AND NON-LINEARITY COMPENSATED AMPLIFIER AND METHOD
    4.
    发明授权
    OFFSET AND NON-LINEARITY COMPENSATED AMPLIFIER AND METHOD 有权
    偏移和非线性补偿放大器和方法

    公开(公告)号：EP1192712B1

    公开(公告)日：2007-12-12

    申请号：EP00923499.8

    申请日：2000-04-19

    申请人： Burr-Brown Corporation

    发明人： WANG, Binan

    IPC分类号： H03F3/14 ,  H03F1/30 ,  H03F3/00 ,  H03F3/45

    CPC分类号： H03F3/45479 ,  H03F2200/261 ,  H03F2200/331

    摘要： Circuitry in an amplifier (1) provides both auto-zeroing of offset errors and finite gain compensation. The circuitry includes a differential main amplifier (3) and a differential auxiliary amplifier (13). During a first phase (ζ1), a previously sampled input voltage is amplified by the main amplifier to produce an output voltage on a first capacitor (C3). A stored prior offset correction voltage stored on a second capacitor (C4A) is applied between the inputs of the auxiliary amplifier, an output of which is coupled to an auxiliary input of the main amplifier to auto-zero its offset voltage. During a second phase (ζ2) the inputs of the main amplifier are short-circuited together, causing it to produce a voltage change on one terminal of the first capacitor (C3), the other terminal of which is switched from ground to one terminal of a second capacitor (C4). This stores updated offset correction voltage on the second capacitor (C4). Since the previous output voltage of the main amplifier remains stored on the first capacitor (C3) during the second phase, the auto-zeroing correction is referenced to the previous value of the output voltage, resulting in compensation for distortion caused by non-linearity of the main amplifier.

    摘要翻译： 放大器（1）中的电路同时提供失调误差的自动归零和有限增益补偿。 该电路包括差分主放大器（3）和差分辅助放大器（13）。 在第一阶段（ζ1）期间，先前采样的输入电压被主放大器放大以在第一电容器（C3）上产生输出电压。 存储在第二电容器（C4A）上的先前存储的偏移校正电压被施加在辅助放大器的输入端之间，辅助放大器的输出端耦合到主放大器的辅助输入端以自动调零其偏移电压。 在第二阶段（ζ2）期间，主放大器的输入端一起短路，使其在第一电容器（C3）的一个端子上产生电压变化，其另一个端子从地切换到第一电容器 第二电容器（C4）。 这将更新的偏移校正电压存储在第二电容器（C4）上。 由于主放大器的前一个输出电压在第二阶段期间保持存储在第一电容器（C3）上，所以自动调零校正以输出电压的先前值为基准，导致补偿由非线性引起的失真 主放大器。

    POWER SUPPLY CIRCUIT
    8.
    发明授权
    POWER SUPPLY CIRCUIT 有权

    公开(公告)号：EP1062523B1

    公开(公告)日：2003-05-28

    申请号：EP99907205.1

    申请日：1999-03-09

    申请人： Indigo Manufacturing Inc.

    发明人： FRENCH, John, Barry ,  RUSSELL, David, I., W.

    IPC分类号： G01S7/481 ,  G01S17/93 ,  G01S17/42

    CPC分类号： G05F1/618 ,  G05F1/613 ,  H02M3/33561 ,  H03F1/0222 ,  H03F1/305 ,  H03F3/45479

    摘要： A composite bridge amplifier in which the power supply for the bridge amplifiers includes a time varying non-ground reference DC voltage supply dependant on the input signal. A low voltage power supply circuit uses the time varying non-ground reference DC voltage to produce a fixed DC voltage and includes a centering block which removes unbalanced DC voltages which might otherwise contaminate the time varying non-ground reference DC voltage, by providing balancing currents. This eliminates a costly transformer. Safety isolation is provided using an isolation amplifier with a transformer which has a parasitic capacitance. Improved common mode noise rejection is provided by configuring the isolation amplifier so that currents charging the parasitic capacitance with common mode noise voltage tend to cancel noise current in the secondary winding of the transformer.

    DIFFERENTIAL AUDIO LINE RECEIVER
    9.
    发明授权
    DIFFERENTIAL AUDIO LINE RECEIVER 失效
    差分低频率线路接收器

    公开(公告)号：EP0799524B1

    公开(公告)日：2003-04-16

    申请号：EP95944208.8

    申请日：1995-12-22

    申请人： WHITLOCK, William E.

    发明人： WHITLOCK, William E.

    IPC分类号： H03F3/45

    CPC分类号： H03F3/347 ,  H03F3/45475 ,  H03F3/45479 ,  H03F3/45941 ,  H03F2200/186 ,  H03F2200/189 ,  H03F2200/261 ,  H03F2200/543

    摘要： A bootstrapped audio line receiver that receives a differential-mode input signal from first and second differential lines and outputs a single-ended signal on an output line. The line receiver includes a differential amplifier and an input amplifier having differential output terminals and differential input terminals. The input amplifier is connected between the differential lines and the differential amplifier. The input amplifier provides a dc current path to a ground terminal while maintaining a high input impedance to ac signals at audio frequencies. The input amplifier also includes an rf filter that removes rf noise without adversely affecting the line receiver's common-mode noise rejection at audio frequencies. In one embodiment, the input amplifier includes two operational amplifiers connected for unity gain and having two bias resistors connected in series between each input terminals of the input amplifier and a ground terminal. A capacitor is connected from the output of each operational amplifier to a node between each set of series connected bias resistors and prevents the low impedance of the bias resistors from significantly degrading the line receiver's common-mode rejection ratio. Thus, the line receiver tolerates a wide range of balanced and unbalanced source impedances with a minimal deterioration of the line receiver's common-mode rejection ratio.