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1.发明授权
公开(公告)号：US5790336A
公开(公告)日：1998-08-04
申请号：US893928
申请日：1997-07-15
CPC分类号： G11B5/09 , G11B5/02 , H03F3/45085 , H03F3/72 , G11B19/04
摘要： A recording apparatus including a magnetic write head and a write amplifier with capacitive current compensation. The write amplifier is made up of four current mirrors which are turned on two at a time by two switchable floating current sources connected between the input terminals of the current mirrors in order to produce a write current of alternating polarity through the write head. The parasitic capacitances across the write head and/or the parasitic capacitances of the write amplifier at the write terminals are neutralized by means of neutralizing capacitors. The high impedance at the terminals of the write head enables the common-mode voltage across the write head to be fixed at any desired voltage value by means of a common-mode circuit.
摘要翻译： 一种包括磁写头和具有电容电流补偿的写放大器的记录装置。 写放大器由四个电流镜组成，两个电流反射镜由连接在电流镜的输入端之间的两个可切换的浮动电流一次打开，以通过写头产生交替极性的写入电流。 写入端子上的写入放大器的写入头和/或寄生电容之间的寄生电容通过中和电容器被中和。 在写入头的端子处的高阻抗使得能够通过共模电路将写入头两端的共模电压固定在任何所需的电压值。
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2.发明授权Magnetic head write amplifier including current mirrors and switchable current sources 失效磁头写放大器，包括电流镜和可切换电流源
公开(公告)号：US5668676A
公开(公告)日：1997-09-16
申请号：US489191
申请日：1995-06-09
CPC分类号： G11B5/022 , G11B5/02 , H03K17/663
摘要： An apparatus for recording on a magnetic record carrier includes a write amplifier comprising four current mirrors which are turned on two at a time by two switchable floating current sources connected between the input terminals of the current mirrors in order to produce a write current of alternating polarity through a write head. The high impedance at the terminals of the write head enables the common-mode voltage across the write head to be fixed at any desired voltage value by means of a common-mode circuit. The symmetrical structure further enables the parasitic capacitances at the write terminals to be neutralized by means of neutralizing capacitors.
摘要翻译： 用于在磁记录载体上记录的装置包括写入放大器，其包括四个电流镜，每个电流镜由连接在电流镜的输入端之间的两个可切换的浮动电流源一次打开，以产生交替极性的写入电流 通过写头。 在写入头的端子处的高阻抗使得能够通过共模电路将写入头两端的共模电压固定在任何所需的电压值。 对称结构进一步使得写入端子处的寄生电容能够通过中和电容中和。
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公开(公告)号：US6091558A
公开(公告)日：2000-07-18
申请号：US909919
申请日：1997-08-12
CPC分类号： G11B20/10212
摘要： A device for write precompensation of data signals to be recorded on a magnetic medium, which device has an input for receiving input data signals and an output for supplying output signals to be recorded, an integrator/limiter circuit which receives the input data signals and which supplies an output signal which is in synchronism with the data signal and whose amplitude varies substantially linearly as a function of time at positions where a signal transition appears in the data signal, which amplitude is limited within a data symbol interval; an adjustable filter which receives the input signals and supplies an output signal whose instantaneous values depend on the pattern of preceding and future signal transitions in the data signal; and a comparator circuit which through comparison of the output signal of the integrator/limiter circuit and the output signal of the filter produces the output signal in which at least some signal transitions of the input data signal can be shifted in time. An important aspect of the present invention is that with the output signal dt an arbitrary number of desired time shifts can be obtained rather than that, as in the prior art, only a choice can be made from a limited number of delay values.
摘要翻译： 一种用于写入预记录在磁介质上的数据信号的装置，该装置具有用于接收输入数据信号的输入端和用于提供要记录的输出信号的输出端，接收输入数据信号的积分器/限幅电路，以及哪个 提供与数据信号同步的输出信号，其幅度随着数据信号中出现信号转变的位置处的时间的函数而基本线性变化，该幅度被限制在数据符号间隔内; 可调滤波器，其接收输入信号并提供其瞬时值取决于数据信号中的先前和未来信号转换的模式的输出信号; 并且通过比较积分器/限幅器电路的输出信号和滤波器的输出信号的比较器电路产生其中输入数据信号的至少一些信号转换可以及时移位的输出信号。 本发明的一个重要方面是，通过输出信号dt，可以获得任意数量的期望时间偏移，而不是象现有技术那样，只能从有限数量的延迟值中进行选择。
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4.发明授权Frequency compensation circuit for stabilizing a differential amplifier with cross-coupled transistors 失效用于稳定具有交叉耦合晶体管的差分放大器的频率补偿电路
公开(公告)号：US5525930A
公开(公告)日：1996-06-11
申请号：US318410
申请日：1994-10-05
IPC分类号： H03F1/08 , H03F1/42 , H03F3/45 , H03K17/0412 , H03K17/042 , H03F1/14
CPC分类号： H03F1/083 , H03F3/45085 , H03F3/45183 , H03K17/04123 , H03K17/04206 , H03F2203/45496 , H03F2203/45548 , H03F2203/45562 , H03F2203/45612
摘要： A differential amplifier comprises a Darlington differential pair (T.sub.1 /T.sub.3, T.sub.2 /T.sub.4) and a cross-coupled transistor pair (T.sub.5, T.sub.6) to increase the transconductance of the Darlington differential pair (T.sub.1 /T.sub.3, T.sub.2 /T.sub.4). The negative input impedance of the differential amplifier as a result of the presence of the cross-coupled differential pair (T.sub.5, T.sub.6) is compensated for at high frequencies and the gain of the differential amplifier is reduced by a compensation circuit with a capacitor (30) between the control electrodes of the transistors of the cross-coupled differential pair (T.sub.5, T.sub.6) and with resistors (26, 28) in series with the control electrodes of the transistors of the cross-coupled differential pair (T.sub.5, T.sub.6).
摘要翻译： 差分放大器包括达林顿差分对（T1 / T3，T2 / T4）和交叉耦合晶体管对（T5，T6），以增加达林顿差分对（T1 / T3，T2 / T4）的跨导。 由于交叉耦合差分对（T5，T6）的存在导致的差分放大器的负输入阻抗在高频下被补偿，并且差分放大器的增益通过具有电容器的补偿电路（30 ）与交叉耦合差分对（T5，T6）的晶体管的控制电极串联的交叉耦合差分对（T5，T6）的晶体管的控制电极和电阻器（26,28）之间。
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