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    • 1. 发明授权
    • Peak hold circuit
    • 峰值保持电路
    • US5134313A
    • 1992-07-28
    • US536472
    • 1990-06-12
    • Takehiko UmeyamaHideki MiyakeYukio Kodama
    • Takehiko UmeyamaHideki MiyakeYukio Kodama
    • G01R19/04G11C27/02
    • G01R19/04G11C27/02G11C27/024
    • In a sampling mode, a servo signal sampling and holding switch (4.sub.a) and a reference voltage sampling and holding switch (30.sub.a) are turned off, so that transistors (Q.sub.7a, Q.sub.5a) are turned on. In response to on states of the transistors (Q.sub.7a, Q.sub.5a), capacities (C.sub.3a, C.sub.30a) are charged with the peak voltage (V.sub.ref +(1/2)V.sub.s) of a servo signal and a reference voltage (V.sub.ref), respectively. In a holding mode, the sampling and holding switches (4.sub.a, 30.sub.a) are turned on, so that the transistors (Q.sub.7a, Q.sub.5a) are turned off. the charging voltages (D, E) of the capacitors (C.sub.3a, C.sub.30a) are discharged through post-stage buffers (5.sub.a, 3.sub.a), so that they include offsets which are canceled through a subtractor (6.sub.a).
    • 在采样模式中,伺服信号采样保持开关(4a)和参考电压采样保持开关(30a)截止,使晶体管(Q7a,Q5a)导通。 响应于晶体管(Q7a,Q5a)的导通状态,电容(C3a,C30a)分别以伺服信号的峰值电压(Vref +(1/2)Vs)和参考电压(Vref)充电。 在保持模式中,采样保持开关(4a,30a)导通,使得晶体管(Q7a,Q5a)截止。 电容器(C3a,C30a)的充电电压(D,E)通过后级缓冲器(5a,3a)放电,使得它们包括通过减法器(6a)消除的偏移。
    • 8. 发明授权
    • Differential magneto-resistive head pre-amplifiers for single polarity power supply applications
    • 用于单极性电源应用的差分磁阻头前置放大器
    • US07187513B2
    • 2007-03-06
    • US10172368
    • 2002-06-14
    • Takehiko UmeyamaRobert B. RossMasashige Tada
    • Takehiko UmeyamaRobert B. RossMasashige Tada
    • G11B5/03
    • G11B5/02G11B5/012G11B2005/0016G11B2005/0018
    • 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.
    • 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
    • Current control circuit of ring oscillator
    • 环形振荡器的电流控制电路
    • US5568103A
    • 1996-10-22
    • US499917
    • 1995-07-11
    • Teruya NakashimaTakehiko Umeyama
    • Teruya NakashimaTakehiko Umeyama
    • H03K3/354H03K3/03H03B5/24H03B5/00H03L7/00H03L7/085
    • H03K3/0315
    • 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.
    • 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
    • Polarity detector
    • 极性检测器
    • US5557220A
    • 1996-09-17
    • US271970
    • 1994-07-08
    • Yukihiro ArayaTakehiko Umeyama
    • Yukihiro ArayaTakehiko Umeyama
    • G01R19/14H01L21/66G01R19/165
    • G01R19/14
    • 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.
    • 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。