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。