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1. 发明授权

US5287231A Write circuit having current mirrors between predriver and write driver circuits for maximum head voltage swing 失效
标题翻译：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
公开(公告)号：US5287231A
公开(公告)日：1994-02-15
申请号：US957612
申请日：1992-10-06
申请人： John S. Shier , Tuan V. Ngo , Douglas R. Peterson
发明人： John S. Shier , Tuan V. Ngo , Douglas R. Peterson
IPC分类号： G11B5/09 , G11B5/02
CPC分类号： G11B5/022 , G11B5/09
摘要： 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.
摘要翻译：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。

2. 发明授权

US5291347A Write driver with H-switch synchronizing transistors 失效
标题翻译：用H开关同步晶体管写驱动
公开(公告)号：US5291347A
公开(公告)日：1994-03-01
申请号：US067673
申请日：1993-05-26
申请人： Tuan V. Ngo , Douglas R. Peterson
发明人： Tuan V. Ngo , Douglas R. Peterson
IPC分类号： G11B5/09 , G11B5/02 , G11B5/03
CPC分类号： G11B5/022 , G11B5/09
摘要： A write driver for driving a transducer in a storage system. The write driver includes first and second supply terminals and a H-switch for switching current flow through the transducer between a first direction and a second direction, opposite to the first direction. The H-switch includes pull-up transistors and pull-down transistors connected across the transducer for switching current flow through the transducer. Each pull-up transistor and pull-down transistor has a control terminal for controlling current flow through the transistor. The write driver further includes data input terminals for receiving data signals. A bias circuit is connected between the control terminals of the pull-up and pull-down transistors and the data input terminals for switching the pull-up and pull-down transistors between conducting and non-conducting states as a function of the received data signals. Each pull-down transistor has a corresponding synchronizing transistor connected between the control terminal of the pull-down transistor and the second supply terminal, which pulls current away from the control terminal of the pull-down transistor when the pull-down transistor is switched to the non-conducting state.
摘要翻译：用于驱动存储系统中的换能器的写入驱动器。写入驱动器包括第一和第二电源端子和H开关，用于在与第一方向相反的第一方向和第二方向之间切换通过换能器的电流。 H开关包括连接在换能器上的上拉晶体管和下拉晶体管，用于切换通过换能器的电流。每个上拉晶体管和下拉晶体管具有用于控制通过晶体管的电流的控制端子。写入驱动器还包括用于接收数据信号的数据输入端。偏置电路连接在上拉和下拉晶体管的控制端子和数据输入端之间，用于根据接收的数据信号在导通状态和非导通状态之间切换上拉和下拉晶体管。每个下拉晶体管具有连接在下拉晶体管的控制端子和第二电源端子之间的对应的同步晶体管，当下拉晶体管切换到时，其将电流从下拉晶体管的控制端子拉出非导电状态。

3. 发明授权

US6111716A Referenced magnetoresistives sensor band pass preamplifier 失效
标题翻译：参考磁阻传感器带通前置放大器
公开(公告)号：US6111716A
公开(公告)日：2000-08-29
申请号：US23510
申请日：1998-02-13
申请人： Tuan V. Ngo , Craig M. Brannon , Douglas R. Peterson
发明人： Tuan V. Ngo , Craig M. Brannon , Douglas R. Peterson
IPC分类号： G11B5/00 , G11B5/012 , G11B5/02 , G11B5/035 , G11B33/12
CPC分类号： G11B5/02 , G11B5/012 , G11B2005/0016 , G11B2005/0018 , G11B33/122 , G11B5/035
摘要： A magnetoresistive sensor and preamplifier system for sensing magnetization patterns in a magnetic disk based digital data storage and retrieval memory with a grounded magnetoresistive sensor The signals from the magnetoresistive sensor are coupled by a coupling capacitor to a grounded differential amplifier. The structure of the coupling capacitor in a monolithic integrated circuit determines the passband for the system in passing the magnetoresistive sensor signals.
摘要翻译：用于利用接地磁阻传感器感测基于磁盘的数字数据存储和检索存储器中的磁化模式的磁阻传感器和前置放大器系统来自磁阻传感器的信号通过耦合电容耦合到接地差分放大器。单片集成电路中的耦合电容器的结构决定了传递磁阻传感器信号时系统的通带。

4. 发明授权

US5345346A Positive feedback low input capacitance differential amplifier 失效
标题翻译：正反馈低输入电容差分放大器
公开(公告)号：US5345346A
公开(公告)日：1994-09-06
申请号：US39859
申请日：1993-03-30
申请人： Craig M. Brannon , Tuan V. Ngo
发明人： Craig M. Brannon , Tuan V. Ngo
IPC分类号： G11B5/00 , G11B5/02 , H03F3/45 , H03K3/287 , H03F3/04 , H03F3/68
CPC分类号： G11B5/02 , G11B5/022 , H03F3/45089 , H03K3/287 , G11B2005/0013 , H03F2203/45024 , H03F2203/45034 , H03F2203/45176
摘要： A read preamplifier for use in reading data in a magnetic storage system uses positive feedback to reduce the preamplifier's input capacitance. The read preamplifier includes first and second voltage supply terminals. An input is coupled to the second voltage supply terminal and receives input signals from a connected magnetic head. An output is coupled to the first voltage supply terminal and to the input for producing output signals based upon the input signals. A positive feedback circuit, coupled to the input reduces the input capacitance of the read preamplifier.
摘要翻译：用于在磁存储系统中读取数据的读取前置放大器使用正反馈来减小前置放大器的输入电容。读前置放大器包括第一和第二电压供应端。输入耦合到第二电压供应端并从连接的磁头接收输入信号。输出耦合到第一电压源端子和输入端，用于基于输入信号产生输出信号。耦合到输入端的正反馈电路减小了读前置放大器的输入电容。

5. 发明授权

US5311146A Current mirror for low supply voltage operation 失效
标题翻译：用于低电源电压工作的电流镜
公开(公告)号：US5311146A
公开(公告)日：1994-05-10
申请号：US9287
申请日：1993-01-26
申请人： Craig M. Brannon , Tuan V. Ngo , John J. Price, Jr.
发明人： Craig M. Brannon , Tuan V. Ngo , John J. Price, Jr.
IPC分类号： H03F3/343 , H03F3/04
CPC分类号： H03F3/343
摘要： The present invention is an improved current mirror circuit. This improved current mirror circuit includes first and second transistors of the same conductivity type and have bases connected together. The first transistor is connected between a first supply terminal and an input terminal. The second transistor is connected between a first supply terminal and an output terminal. Included is a feedback circuit for providing a voltage feedback between the input terminal and the bases of the first and second transistors. Also included is a bias circuit for providing a bias current to the feedback circuit that is based on the input current.
摘要翻译：本发明是改进的电流镜电路。该改进的电流镜电路包括具有相同导电类型的第一和第二晶体管，并且具有连接在一起的基极。第一晶体管连接在第一电源端子和输入端子之间。第二晶体管连接在第一供电端子和输出端子之间。包括用于在输入端和第一和第二晶体管的基极之间提供电压反馈的反馈电路。还包括用于向基于输入电流的反馈电路提供偏置电流的偏置电路。

6. 发明授权

US4827222A Input offset voltage trimming network and method 失效
标题翻译：输入失调电压调整网络及方法
公开(公告)号：US4827222A
公开(公告)日：1989-05-02
申请号：US131804
申请日：1987-12-11
申请人： Richard E. Hester , Tuan V. Ngo
发明人： Richard E. Hester , Tuan V. Ngo
IPC分类号： H01C17/23 , H03F3/45
CPC分类号： H03F3/45623 , H01C17/23 , H03F2203/45048
摘要： 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.
摘要翻译：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。

7. 发明授权

US06236247B1 Impedance pseudo-matched write driver 有权
标题翻译：阻抗伪匹配写驱动
公开(公告)号：US06236247B1
公开(公告)日：2001-05-22
申请号：US09433177
申请日：1999-11-03
申请人： Tuan V. Ngo
发明人： Tuan V. Ngo
IPC分类号： H03K100
CPC分类号： G11B5/022 , G11B5/012 , G11B5/02 , G11B2005/0013
摘要： An impedance matching circuit for a write driver matches the differential impedance of the winding of the write head and the transmission line to the write head. The impedance matching circuit includes a resistor connected between a node and a current switch of the write driver. The resistor has an impedance value matching the differential impedance value of the transmission line and head. During quiescent or steady state operation, the write driver provides a DC write current in a selected direction through the winding, and the resistor matches the differential impedance of the head and transmission line. During switching to reverse direction of write current through the winding, however, the resistor dampens voltage swings at the node to minimize current undershoot. Optionally, a capacitor is in parallel with the resistor to short-circuit the resistor during switching to improve the rise-time characteristics of the current reversal, but at a sacrifice of the impedance characteristics during switching.
摘要翻译：用于写入驱动器的阻抗匹配电路将写入头和传输线的绕组的差分阻抗与写入头匹配。阻抗匹配电路包括连接在节点和写入驱动器的电流开关之间的电阻器。电阻器具有与传输线和头部的差分阻抗值相匹配的阻抗值。在静态或稳态操作期间，写驱动器通过绕组在所选方向提供DC写入电流，并且电阻器匹配磁头和传输线的差分阻抗。然而，在切换到通过绕组的写入电流的反向方向时，电阻器会抑制节点处的电压摆幅，以最小化电流下冲。可选地，电容器与电阻器并联，以在切换期间使电阻器短路以改善电流反转的上升时间特性，但是在切换期间牺牲阻抗特性。

8. 发明授权

US6150876A Voltage bias, current sense preamplifier for a magnetoresistive reader 有权
标题翻译：用于磁阻读取器的电压偏置电流检测前置放大器
公开(公告)号：US6150876A
公开(公告)日：2000-11-21
申请号：US285475
申请日：1999-04-02
申请人： Tuan V. Ngo
发明人： Tuan V. Ngo
IPC分类号： G11B5/00 , G11B5/012 , G11B5/02 , G11B5/09 , H03F1/22 , G06G7/12
CPC分类号： G11B5/012 , G11B5/02 , H03F1/22 , G11B2005/0016 , G11B2005/0018 , G11B5/09
摘要： A preamplifier system for receiving information from at least one magnetoresistive head cell and for supplying a signal to circuitry external to the preamplifier system is disclosed. The preamplifier system includes a bias current generator, a first preamplifier gain stage, and a second preamplifier gain stage. The bias current generator is connected between a first potential and the magnetoresistive head cell for providing a bias current to the magnetoresistive head cell. The first and second preamplifier gain stages include multiple transistors, resistors, capacitors, and current sources. The combination of first and second preamplifier gain stages provide the proper amplification of a signal received from the head cell while eliminating an unwanted DC offset signal.
摘要翻译：公开了一种用于从至少一个磁阻头单元接收信息并用于向前置放大器系统外部的电路提供信号的前置放大器系统。前置放大器系统包括偏置电流发生器，第一前置放大器增益级和第二前置放大器增益级。偏置电流发生器连接在第一电位和磁阻头单元之间，用于向磁阻头单元提供偏置电流。第一和第二前置放大器增益级包括多个晶体管，电阻器，电容器和电流源。第一和第二前置放大器增益级的组合提供从头单元接收的信号的适当放大，同时消除不需要的DC偏移信号。

9. 发明授权

US5990710A High performance write driver for magnetic inductive recording head 失效
标题翻译：磁性感应记录头的高性能写入驱动器
公开(公告)号：US5990710A
公开(公告)日：1999-11-23
申请号：US867097
申请日：1997-06-02
申请人： Tuan V. Ngo , Raymond E. Barnett
发明人： Tuan V. Ngo , Raymond E. Barnett
IPC分类号： G11B5/02 , G11B5/09 , H03F3/45 , H03K17/0412 , H03K17/66 , H03B1/00
CPC分类号： G11B5/022 , G11B5/02 , H03F3/45085 , H03K17/04126 , H03K17/661 , G11B5/09
摘要： A circuit is provided to switch a drive transistor in a write driver circuit controlled by a write control signal to direct write current in a selected direction through an inductive head. Current is selectively conducted from a control region of the drive transistor in response to switching of the write control signal. A first bias circuit limits voltage fluctuation at the control region of the drive transistor. A second bias circuit prevents saturation of the drive transistor.
摘要翻译：提供电路来切换由写入控制信号控制的写入驱动器电路中的驱动晶体管，以通过感应头直接写入指向所选方向的电流。响应于写入控制信号的切换，电流从驱动晶体管的控制区选择性地导通。第一偏置电路限制驱动晶体管的控制区域处的电压波动。第二偏置电路防止驱动晶体管的饱和。

10. 发明授权

US5831784A Pseudo differential voltage sense MR preamplifier with improved bandwidth 失效
标题翻译：具有改进带宽的伪差分电压检测MR前置放大器
公开(公告)号：US5831784A
公开(公告)日：1998-11-03
申请号：US709345
申请日：1996-09-05
申请人： Raymond E. Barnett , Craig M. Brannon , Tuan V. Ngo
发明人： Raymond E. Barnett , Craig M. Brannon , Tuan V. Ngo
IPC分类号： G11B5/00 , G11B5/012 , G11B5/02 , H03F3/45 , G11B5/03
CPC分类号： H03F3/45479 , G11B5/012 , G11B5/02 , G11B2005/0018
摘要： 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.
摘要翻译：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。

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