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    • 3. 发明授权
    • Pseudo differential voltage sense MR preamplifier with improved bandwidth
    • 具有改进带宽的伪差分电压检测MR前置放大器
    • US5831784A
    • 1998-11-03
    • US709345
    • 1996-09-05
    • Raymond E. BarnettCraig M. BrannonTuan V. Ngo
    • Raymond E. BarnettCraig M. BrannonTuan V. Ngo
    • G11B5/00G11B5/012G11B5/02H03F3/45G11B5/03
    • H03F3/45479G11B5/012G11B5/02G11B2005/0018
    • A preamplifier and its associated biasing circuitry for connection to a magnetoresistive sensor having a first end and a second end is disclosed. The biasing circuitry properly biases the preamplifier such that the preamplifier can properly read signals from the sensor. The preamplifier includes a first transistor. A base of the first transistor is connected to the first end of the magnetoresistive sensor. An emitter of the second transistor is connected to the emitter of the first transistor. A collector of the third transistor is connected to the collector of the first transistor. A base of the fourth transistor is connected to the second end of the magnetoresistive sensor, while the collector of the fourth transistor is connected to the collector of the second transistor, and the emitter of the fourth transistor is connected to the emitter of the third transistor. The preamplifier further includes a voltage source and a first and a second resistor. The first resistor is connected between the voltage source and the collector of the first and third transistors, while the second transistor is connected between the voltage source and the collectors of the second and fourth transistors. Finally, a first current source is connected between the emitters of the first and second transistors and ground, while a second current source is connected between the emitters of the third and fourth transistors and ground.
    • 公开了一种用于连接到具有第一端和第二端的磁阻传感器的前置放大器及其相关的偏置电路。 偏置电路适当地偏置前置放大器,使得前置放大器可以适当地从传感器读取信号。 前置放大器包括第一晶体管。 第一晶体管的基极连接到磁阻传感器的第一端。 第二晶体管的发射极连接到第一晶体管的发射极。 第三晶体管的集电极连接到第一晶体管的集电极。 第四晶体管的基极连接到磁阻传感器的第二端,而第四晶体管的集电极连接到第二晶体管的集电极,第四晶体管的发射极连接到第三晶体管的发射极 。 前置放大器还包括电压源和第一和第二电阻器。 第一电阻器连接在第一和第三晶体管的电压源和集电极之间,而第二晶体管连接在电压源和第二和第四晶体管的集电极之间。 最后,第一电流源连接在第一和第二晶体管的发射极和地之间,而第二电流源连接在第三和第四晶体管的发射极和地之间。
    • 6. 发明授权
    • Amplifier having a differential input capacitance cancellation circuit
    • 具有差分输入电容消除电路的放大器
    • US5793551A
    • 1998-08-11
    • US477291
    • 1995-06-07
    • Tuan V. NgoRaymond E. BarnettCraig M. Brannon
    • Tuan V. NgoRaymond E. BarnettCraig M. Brannon
    • G11B5/012G11B5/02G11B5/035G11B5/09
    • G11B5/012G11B5/02G11B5/09G11B5/035
    • A first differential amplifier circuit is provided having a first and second input terminal suited for connection to a magnetic head. The first differential amplifier circuit includes first and second output terminals for providing a read output signal. A second differential amplifier circuit is provided which has first and second input terminals connected to the first and second input terminals, respectively, the first differential amplifier circuit. The second differential amplifier circuit also includes first and second output terminals. A first feedback capacitor is provided which is connected between the first input terminal of the first differential amplifier circuit and the first output terminal of the second differential amplifier circuit. A second feedback capacitor is provided which is connected between the second input terminal of the first differential amplifier circuit and the second output terminal of the second differential amplifier circuit.
    • 提供了具有适于连接到磁头的第一和第二输入端的第一差分放大器电路。 第一差分放大器电路包括用于提供读取输出信号的第一和第二输出端子。 提供了第二差分放大器电路,其具有分别连接到第一和第二输入端子的第一和第二输入端子,第一差分放大器电路。 第二差分放大器电路还包括第一和第二输出端子。 提供第一反馈电容器,其连接在第一差分放大器电路的第一输入端和第二差分放大器电路的第一输出端之间。 提供第二反馈电容器,其连接在第一差分放大器电路的第二输入端子和第二差分放大器电路的第二输出端子之间。
    • 9. 发明授权
    • Write circuit having current mirrors between predriver and write driver
circuits for maximum head voltage swing
    • 写电路在预驱动器和写驱动器电路之间具有电流镜,用于最大磁头电压摆幅
    • US5287231A
    • 1994-02-15
    • US957612
    • 1992-10-06
    • John S. ShierTuan V. NgoDouglas R. Peterson
    • John S. ShierTuan V. NgoDouglas R. Peterson
    • G11B5/09G11B5/02
    • G11B5/022G11B5/09
    • A write circuit for driving a magnetic head in a magnetic storage system which greatly improves the voltage swing across the magnetic head. The write circuit includes data input for receiving data input signals, a predriver current source, a predriver circuit, and a write driver circuit. The predriver circuit is connected to the data input and has first and second predriver current paths. The predriver current paths are connected to a predriver current source. The predriver circuit directs current from the predriver current source through the first and second predriver current paths as a function of the data input signals. The write driver circuit has first and second write currents paths connected across the magnetic head. The first write current path directs current through the magnetic head in a first direction and the second write current path directs current through the magnetic head in a second direction, opposite to the first direction. The predriver circuit and the write driver circuit are connected together in a current mirror configuration to mirror the predriver current from the first and second predriver currents paths into the first and second write driver currents paths, respectively.
    • 用于在磁存储系统中驱动磁头的写入电路,其极大地改善了跨磁头的电压摆动。 写入电路包括用于接收数据输入信号的数据输入,预驱动电流源,预驱动电路和写入驱动器电路。 预驱动电路连接到数据输入端,并具有第一和第二预驱动电流路径。 预驱动电流路径连接到预驱动电流源。 预驱动电路将来自预驱动电流源的电流作为数据输入信号的函数引导通过第一和第二预驱动电流路径。 写入驱动器电路具有连接在磁头上的第一和第二写入电流路径。 第一写入电流路径在第一方向上引导电流通过磁头,并且第二写入电流路径在与第一方向相反的第二方向上引导电流通过磁头。 预驱动电路和写驱动器电路以电流镜配置连接在一起,以分别将来自第一和第二预驱动电流路径的预驱动电流反映到第一和第二写驱动器电流路径中。
    • 10. 发明授权
    • Input offset voltage trimming network and method
    • 输入失调电压调整网络及方法
    • US4827222A
    • 1989-05-02
    • US131804
    • 1987-12-11
    • Richard E. HesterTuan V. Ngo
    • Richard E. HesterTuan V. Ngo
    • H01C17/23H03F3/45
    • H03F3/45623H01C17/23H03F2203/45048
    • Trimming of input offset voltage of a diferential amplifier is provided by a pair of resistance networks which are connected to the emitters of a pair of current mirror transistors. By adjusting the resistances of the resistance networks, the adjustment currents flowing through the current mirror transistors are selected to cancel out the input offset voltage of the differential amplifier. Each resistance network includes a plurality of resistors connected in series with a low resistance shorting link connected in parallel with each of the plurality of resistances. The input offset voltage is trimmed by selectively cutting the shorting links with a two-phase measure and trim process.
    • 通过连接到一对电流镜晶体管的发射极的一对电阻网络来提供差分放大器的输入失调电压的微调。 通过调整电阻网络的电阻,选择流过电流镜晶体管的调节电流来抵消差分放大器的输入偏移电压。 每个电阻网络包括与与多个电阻中的每一个平行连接的低电阻短路连杆串联连接的多个电阻器。 通过用两相测量和修整过程选择性地切割短路链路来修剪输入失调电压。