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1. 发明授权

US5453718A Differential amplifier for reducing input capacitance without deterorating noise characteristics 失效
标题翻译：用于降低输入电容的差分放大器，不会阻碍噪声特性
公开(公告)号：US5453718A
公开(公告)日：1995-09-26
申请号：US284122
申请日：1994-08-02
申请人： Katuyuki Kurokawa , Takehiko Umeyama , Masayasu Tanaka
发明人： Katuyuki Kurokawa , Takehiko Umeyama , Masayasu Tanaka
IPC分类号： H03F3/45
CPC分类号： H03F3/4521 , H03F3/45089 , H03F2203/45024 , H03F2203/45031 , H03F2203/45302 , H03F2203/45366 , H03F2203/45584 , H03F2203/45594 , H03F2203/45702
摘要： A differential amplifier (101) includes an input circuit (20), a bias circuit (31) and an output circuit (50). In the input circuit (20), when base potentials of transistors (Q1) and (Q2) change respectively by .DELTA.V and -.DELTA.V thereby changing current flowing through the transistors (Q1) and (Q2) by .DELTA.I and -.DELTA.I, respectively, base-emitter voltages of transistors (Q5) and (Q9) equally increase by .DELTA.V in the bias circuit (31). However, since a base potential of the transistor (Q5) is fixed, an emitter potential of the transistor (Q9) drops by 2.DELTA.V, decreasing a base potential of a transistor (Q4) by 2.DELTA.V. On the other hand, since a current flowing through the transistor (Q4) changes by -.DELTA.I, a base-emitter voltage of the transistor (Q4) accordingly falls by .DELTA.V. This reduces an emitter potential of the transistor (Q4), i.e., a collector potential of the transistor (Q2) by .DELTA.V, and hence, a base-emitter voltage of the transistor (Q2) stays unchanged. Thus, Miller effect is prevented and an input capacitance is reduced.
摘要翻译：差分放大器（101）包括输入电路（20），偏置电路（31）和输出电路（50）。在输入电路（20）中，当晶体管（Q1）和（Q2）的基极电位分别改变DELTA V和-TATA V，从而改变流过晶体管（Q1）和（Q2）的电流DELTA I和DELTA I 晶体管（Q5）和（Q9）的基极 - 发射极电压分别在偏置电路（31）中增加DELTA V. 然而，由于晶体管（Q5）的基极电位是固定的，所以晶体管（Q9）的发射极电位下降2VTAV，将晶体管（Q4）的基极电位降低2VTA。另一方面，由于流过晶体管（Q4）的电流改变了-ΔTA，所以晶体管（Q4）的基极 - 发射极电压相应地下降了DELTA V.这降低了晶体管（Q4）的发射极电位，即集电极电位（Q2）的晶体管（Q2）的晶体管（Q2）的基极 - 发射极电压保持不变。因此，可以防止米勒效应，降低输入电容。

2. 发明申请

US20120081021A1 DRIVING CIRCUIT FOR AND SEMICONDUCTOR DEVICE FOR DRIVING LASER DIODE 有权
标题翻译：用于驱动激光二极管的驱动电路和半导体器件
公开(公告)号：US20120081021A1
公开(公告)日：2012-04-05
申请号：US13324726
申请日：2011-12-13
申请人： Tsuyoshi Horiuchi , Takehiko Umeyama
发明人： Tsuyoshi Horiuchi , Takehiko Umeyama
IPC分类号： H05B37/02
CPC分类号： H01S5/042 , H01S5/0427
摘要： A driving circuit supplies a suppression current (I4) which reduces a decrease in a driving current (Idrive) immediately after occurrence of an overshoot at the time of the rise of the driving current (Idrive) to a laser diode (1). The driving circuit draws a suppression current (I5) which reduces an increase in the driving current (Idrive) immediately after occurrence of an undershoot at the time of the fall of the driving current (Idrive) from the driving current (Idrive).
摘要翻译：驱动电路提供抑制电流（I4），该抑制电流（I4）在驱动电流（Idrive）上升到激光二极管（1）之后，立即将出现过冲之后的驱动电流（Idrive）减小。驱动电路吸收抑制电流（I5），其在驱动电流（Idrive）从驱动电流（Idrive）下降时发生下冲之后立即减小驱动电流（Idrive）的增加。

3. 发明授权

US08098023B2 Driving circuit for and semiconductor device for driving laser diode 有权
标题翻译：用于驱动激光二极管的驱动电路和半导体器件
公开(公告)号：US08098023B2
公开(公告)日：2012-01-17
申请号：US12846955
申请日：2010-07-30
申请人： Tsuyoshi Horiuchi , Takehiko Umeyama
发明人： Tsuyoshi Horiuchi , Takehiko Umeyama
IPC分类号： H05B37/02
CPC分类号： H01S5/042 , H01S5/0427
摘要： A driving circuit supplies a suppression current (I4) which reduces a decrease in a driving current (Idrive) immediately after occurrence of an overshoot at the time of the rise of the driving current (Idrive) to a laser diode (1). The driving circuit draws a suppression current (I5) which reduces an increase in the driving current (Idrive) immediately after occurrence of an undershoot at the time of the fall of the driving current (Idrive) from the driving current (Idrive).
摘要翻译：驱动电路提供抑制电流（I4），该抑制电流（I4）在驱动电流（Idrive）上升到激光二极管（1）之后，立即将出现过冲之后的驱动电流（Idrive）减小。驱动电路吸收抑制电流（I5），其在驱动电流（Idrive）从驱动电流（Idrive）下降时发生下冲之后立即减小驱动电流（Idrive）的增加。

4. 发明授权

US06731449B2 Magnetic recording writing circuit 失效
标题翻译：磁记录电路
公开(公告)号：US06731449B2
公开(公告)日：2004-05-04
申请号：US09878331
申请日：2001-06-12
申请人： Yasuhiro Okazaki , Takehiko Umeyama , Tsuyoshi Horiuchi , Hiroshi Murakami
发明人： Yasuhiro Okazaki , Takehiko Umeyama , Tsuyoshi Horiuchi , Hiroshi Murakami
IPC分类号： G11B502
CPC分类号： G11B5/022 , G11B5/012 , G11B5/02 , G11B2005/0013
摘要： In a magnetic recording writing circuit, a current having a higher level than a write current is supplied for a period of time during rise and fall of the write current, and a current having a lower level than the write current is supplied for a period of time during overshoot at the rise and fall of the write current. Accordingly, the write current can recover quickly from overshoot.
摘要翻译：在磁记录写入电路中，在写入电流的上升和下降期间提供具有比写入电流更高电平的电流一段时间，并且提供具有比写入电流低的电流，持续一段时间在写入电流的上升和下降时的过冲时间。因此，写入电流可以从过冲快速恢复。

5. 发明授权

US06683487B2 Current driver circuit for supplying write current to a write head while changing a flow direction of the write current 失效
标题翻译：用于在改变写入电流的流动方向的同时向写入头提供写入电流的当前驱动器电路
公开(公告)号：US06683487B2
公开(公告)日：2004-01-27
申请号：US10212702
申请日：2002-08-07
申请人： Toru Takeuchi , Takehiko Umeyama
发明人： Toru Takeuchi , Takehiko Umeyama
IPC分类号： H03K1756
CPC分类号： G11B5/022 , G11B5/09 , H03K17/04163 , H03K17/6872
摘要： An H-type bridge circuit includes four transistors, two resistors, and a write head. A write current supplied from a current supply circuit including a first of the transistors and resistors flows through the write head and is received in a current receiving circuit including a second of the resistors and a fourth of the transistors, and another write current supplied from a current supply circuit including the second of the transistors and the second resistor flows through the write head and is received in a current receiving circuit including the first of the resistors and the third of the transistors. Impedance of the write head matches an output impedance of the current supply circuit and matches an input impedance of the current receiving circuit.
摘要翻译： H型桥式电路包括四个晶体管，两个电阻和一个写入头。从包括第一晶体管和电阻器的电流源电路提供的写入电流流过写入头，并被接收在包括电阻器中的第二个和晶体管中的第四个的电流接收电路中，并且从一个包括第二晶体管和第二电阻器的电流供给电路流过写入头并被接收在包括第一电阻器和第三晶体管的电流接收电路中。写头的阻抗匹配电流供应电路的输出阻抗并匹配电流接收电路的输入阻抗。

6. 发明授权

US07791288B2 Driving circuit for and semiconductor device for driving laser diode 有权
标题翻译：用于驱动激光二极管的驱动电路和半导体器件
公开(公告)号：US07791288B2
公开(公告)日：2010-09-07
申请号：US12068535
申请日：2008-02-07
申请人： Tsuyoshi Horiuchi , Takehiko Umeyama
发明人： Tsuyoshi Horiuchi , Takehiko Umeyama
IPC分类号： H05B37/02
CPC分类号： H01S5/042 , H01S5/0427
摘要： A driving circuit supplies a suppression current (I4) which reduces a decrease in a driving current (Idrive) immediately after occurrence of an overshoot at the time of the rise of the driving current (Idrive) to a laser diode (1). The driving circuit draws a suppression current (I5) which reduces an increase in the driving current (Idrive) immediately after occurrence of an undershoot at the time of the fall of the driving current (Idrive) from the driving current (Idrive).
摘要翻译：驱动电路提供抑制电流（I4），该抑制电流（I4）在驱动电流（Idrive）上升到激光二极管（1）之后，立即将出现过冲之后的驱动电流（Idrive）减小。驱动电路吸收抑制电流（I5），其在驱动电流（Idrive）从驱动电流（Idrive）下降时发生下冲之后立即减小驱动电流（Idrive）的增加。

7. 发明授权

US07372882B2 Driving circuit for and semiconductor device for driving laser diode 失效
标题翻译：用于驱动激光二极管的驱动电路和半导体器件
公开(公告)号：US07372882B2
公开(公告)日：2008-05-13
申请号：US11115133
申请日：2005-04-27
申请人： Tsuyoshi Horiuchi , Takehiko Umeyama
发明人： Tsuyoshi Horiuchi , Takehiko Umeyama
IPC分类号： H01S3/00
CPC分类号： H01S5/042 , H01S5/0427
摘要： A driving circuit supplies a suppression current (I4) which reduces a decrease in a driving current (Idrive) immediately after occurrence of an overshoot at the time of the rise of the driving current (Idrive) to a laser diode (1). The driving circuit draws a suppression current (I5) which reduces an increase in the driving current (Idrive) immediately after occurrence of an undershoot at the time of the fall of the driving current (Idrive) from the driving current (Idrive).
摘要翻译：驱动电路提供抑制电流（I 4），该抑制电流（I 4）在驱动电流（Idrive）上升到激光二极管（1）之后，立即将出现过冲之后的驱动电流（Idrive）减小。驱动电路在驱动电流（Idrive）从驱动电流（Idrive）下降时，产生抑制电流（I 5），该抑制电流（I 5）在即将发生下冲之后立即减小驱动电流（Idrive）的增加。

8. 发明授权

US07187513B2 Differential magneto-resistive head pre-amplifiers for single polarity power supply applications 有权
标题翻译：用于单极性电源应用的差分磁阻头前置放大器
公开(公告)号：US07187513B2
公开(公告)日：2007-03-06
申请号：US10172368
申请日：2002-06-14
申请人： Takehiko Umeyama , Robert B. Ross , Masashige Tada
发明人： Takehiko Umeyama , Robert B. Ross , Masashige Tada
IPC分类号： G11B5/03
CPC分类号： G11B5/02 , G11B5/012 , G11B2005/0016 , G11B2005/0018
摘要： Magneto-resistive (MR) head pre-amplifiers for single polarity power supply applications are presented. An exemplary pre-amplifier includes a bias network coupled to first and second input terminals of the pre-amplifier, the input terminals for receiving signals corresponding to variations in magnetic fields from an MR head. At least one gain stage having first and second input terminals and first and second output terminals for amplifying the received signals is included. A pair of coupling capacitors, each capacitor being connected between a respective input terminal of the pre-amplifier and a corresponding respective input terminal of the at least one gain stage, are further included in the pre-amplifier design. Finally, the exemplary pre-amplifier includes a pair of feedback capacitors, each capacitor being connected between respective input and output terminals of the at least one gain stage. The pre-amplifier is powered by a single polarity power supply.
摘要翻译：介绍了用于单极性电源应用的磁阻（MR）磁头前置放大器。示例性前置放大器包括耦合到前置放大器的第一和第二输入端的偏置网络，用于接收对应于来自MR磁头的磁场变化的信号的输入端。包括具有第一和第二输入端的至少一个增益级和用于放大接收信号的第一和第二输出端。在前置放大器设计中还包括一对耦合电容器，每个电容器连接在前置放大器的相应输入端子和至少一个增益级的对应的相应输入端子之间。最后，示例性前置放大器包括一对反馈电容器，每个电容器连接在至少一个增益级的相应的输入和输出端子之间。前置放大器由单极性电源供电。

9. 发明授权

US5568103A Current control circuit of ring oscillator 失效
标题翻译：环形振荡器的电流控制电路
公开(公告)号：US5568103A
公开(公告)日：1996-10-22
申请号：US499917
申请日：1995-07-11
申请人： Teruya Nakashima , Takehiko Umeyama
发明人： Teruya Nakashima , Takehiko Umeyama
IPC分类号： H03K3/354 , H03K3/03 , H03B5/24 , H03B5/00 , H03L7/00 , H03L7/085
CPC分类号： H03K3/0315
摘要： A current control circuit of a ring oscillator is provided for use in the PLL oscillators. A current control circuit used in the ring oscillator comprises a first circuit having a first current source and a first transistor connected in series; a second circuit connected with the first circuit in parallel and having n second constant current sources and n second transistors connected in series, respectively, the second transistors are current mirrored with the first transistor in the first circuit, respectively; a third circuit connected with the first circuit in parallel and having a third transistor and a fourth transistor connected in series, the fourth transistor is current mirrored with the first transistor; n diodes connected to a connecting point of said third transistor and the fourth transistor for supplying currents to connecting points of n second constant current sources and the second transistor, respectively; an input terminal connected with the connecting point of the first constant current source and the first transistor.
摘要翻译：提供环形振荡器的电流控制电路用于PLL振荡器。在环形振荡器中使用的电流控制电路包括具有串联连接的第一电流源和第一晶体管的第一电路; 分别与第一电路并联连接并具有n个第二恒定电流源的第二电路和分别串联连接的n个第二晶体管，第二晶体管分别与第一电路中的第一晶体管电流镜像; 与第一电路并联连接并具有串联连接的第三晶体管和第四晶体管的第三电路，第四晶体管与第一晶体管电流镜像; 连接到所述第三晶体管和第四晶体管的连接点的n个二极管分别用于向n个第二恒定电流源和第二晶体管的连接点提供电流; 与第一恒定电流源和第一晶体管的连接点连接的输入端子。

10. 发明授权

US5557220A Polarity detector 失效
标题翻译：极性检测器
公开(公告)号：US5557220A
公开(公告)日：1996-09-17
申请号：US271970
申请日：1994-07-08
申请人： Yukihiro Araya , Takehiko Umeyama
发明人： Yukihiro Araya , Takehiko Umeyama
IPC分类号： G01R19/14 , H01L21/66 , G01R19/165
CPC分类号： G01R19/14
摘要： A polarity detector wherein voltage-to-current converters (21, 22) connected to transmission paths (1, 2) output currents according to potentials at the transmission paths (1, 2), respectively, and a current adder (23) adds the currents together. A current-to-voltage converter (24) converts the added current into the voltage (14). And comparators, whose offset voltage is less than 0 V (for example, -5 V) or more than 0 V (for example, 5 V) compare the output voltage (14) with a reference voltage to output signals indicative of whether the output voltage (14) is within a predetermined range, or more than the upper limit of the predetermined range, or less than the lower limit of the predetermined range. The polarity detector for discriminating the polarity of the plurality of transmission paths supplying signals and DC voltages is thus integrated, thereby reducing parts thereof.
摘要翻译：一种极性检测器，其中连接到传输路径（1,2）的电压 - 电流转换器（21,22）分别根据传输路径（1,2）上的电位和电流加法器（23）输出电流，电流在一起。电流 - 电压转换器（24）将所加电流转换成电压（14）。而其偏移电压小于0V（例如-5V）或大于0V（例如5V）的比较器将输出电压（14）与参考电压进行比较，以输出指示输出电压（14）在预定范围内，或大于预定范围的上限，或小于预定范围的下限。因此，用于识别提供信号和DC电压的多个传输路径的极性的极性检测器被积分，从而减少其部分。

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