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    • 11. 发明授权
    • Amplifier circuit for optical disk drive
    • 用于光盘驱动器的放大器电路
    • US07476839B2
    • 2009-01-13
    • US10983737
    • 2004-11-09
    • Hiroshi YamaguchiMasaki Taniguchi
    • Hiroshi YamaguchiMasaki Taniguchi
    • H03F3/06H03F3/45H03G3/00G11B11/00
    • H03F3/08H03F3/45085H03F2203/45466H03G3/3084
    • An operational amplifier including a pair of differential input transistors is provided with a feedback resistor switching circuit and a variable current source. When a loaded optical disk is a DVD-ROM, the feedback resistor switching circuit reduces a gain of the operational amplifier and the variable current source selects a large current (of, for example, 1 mA) as a common bias current supplied to the differential input transistors. When the loaded optical disk is a DVD-RAM with low reflectance and low recording/reproducing speed, the feedback resistor switching circuit enhances the gain of the operational amplifier and the variable current source selects a small current (of, for example, 0.5 mA) as the common bias current.
    • 包括一对差分输入晶体管的运算放大器设置有反馈电阻器切换电路和可变电流源。 当加载的光盘是DVD-ROM时,反馈电阻器开关电路降低运算放大器的增益,并且可变电流源选择大电流(例如,1mA)作为提供给差分器的公共偏置电流 输入晶体管。 当装载的光盘是具有低反射率和低记录/再现速度的DVD-RAM时,反馈电阻器切换电路增强了运算放大器的增益,并且可变电流源选择小电流(例如,0.5mA) 作为常见的偏置电流。
    • 14. 发明授权
    • Amplifier unit and optical disc drive
    • 放大器单元和光盘驱动器
    • US07391265B2
    • 2008-06-24
    • US11430241
    • 2006-05-09
    • Shinichi MiyamotoYousuke KuroiwaMasaya UedaHideo FukudaHiroshi YamaguchiMasaki Taniguchi
    • Shinichi MiyamotoYousuke KuroiwaMasaya UedaHideo FukudaHiroshi YamaguchiMasaki Taniguchi
    • H03F3/45H03F3/08
    • H03F3/3432H03F3/08H03F2200/78
    • An amplifier unit is provided, with which the need for manufacturing a photoelectric conversion IC in Bi-CMOS process is eliminated, and relatively low process cost of the photoelectric conversion IC is achieved. The input section of a buffer (the base of a transistor Q5) is connected with a plurality of patterns of phase compensation circuits each including a resistor and a capacitor connected in series. A bipolar transistor (Q6) is interposed between a positive power supply line and a capacitor (C2) forming a capacitance of the phase compensation circuit. By switching on/off the bipolar transistor (Q6), the capacitance value and resistance value of the phase compensation circuit are switched. Since the bipolar transistor (Q6) is interposed between the capacitor (C2) and the positive power supply line, base current (Isw) acting as a switch signal does not affect the amplifier unit.
    • 提供放大器单元,消除了在Bi-CMOS工艺中制造光电转换IC的需要,并且实现了光电转换IC的相对低的处理成本。 缓冲器(晶体管Q 5的基极)的输入部分与多个相位补偿电路相连,每个相位补偿电路均包括串联连接的电阻器和电容器。 在正电源线和形成相位补偿电路的电容的电容器(C 2)之间插入双极晶体管(Q6)。 通过接通/关断双极晶体管(Q 6),相位补偿电路的电容值和电阻值被切换。 由于双极晶体管(Q 6)插在电容器(C 2)和正电源线之间,所以作为开关信号的基极电流(Isw)不影响放大器单元。
    • 18. 发明授权
    • Output impedance varying circuit
    • 输出阻抗变化电路
    • US07365302B2
    • 2008-04-29
    • US11329029
    • 2006-01-11
    • Hiroshi YamaguchiMasaki Taniguchi
    • Hiroshi YamaguchiMasaki Taniguchi
    • G01J1/44
    • H03F3/3069H03F1/08H03F1/56H03F3/08H03F3/087H03F3/343
    • A photo detector IC (PDIC) is connected with a flexible printed circuit board (FPC). A signal converted into a voltage through light-to-voltage conversion in the PDIC is connected with the drain of a field effect transistor (FET), while the source of the FET is connected to an output terminal. A signal from the output terminal is input into a signal processing board of the main body via the FPC serving as an equivalent circuit composed of a coil and a capacitor. The gate of the FET is connected with a variable voltage source. Peaking occurs due to inductor components and capacitance components of the FPC. However, by application of voltage to the variable voltage source, the gate voltage value of the FET is adjusted to be an optimal value, whereby the peaking is suppressed by the on-resistance of the FET.
    • 光电检测器IC(PDIC)与柔性印刷电路板(FPC)连接。 在PDIC中通过光电压转换成电压的信号与场效应晶体管(FET)的漏极连接,而FET的源极连接到输出端子。 来自输出端子的信号经由作为由线圈和电容器组成的等效电路的FPC输入到主体的信号处理板。 FET的栅极与可变电压源连接。 由于FPC的电感器元件和电容元件引起峰化。 然而,通过向可变电压源施加电压,将FET的栅极电压值调整为最佳值,由此通过FET的导通电阻来抑制峰值。
    • 20. 发明申请
    • Optical integrated device
    • 光学集成设备
    • US20050147011A1
    • 2005-07-07
    • US11022816
    • 2004-12-28
    • Shinya EsakiMasaki Taniguchi
    • Shinya EsakiMasaki Taniguchi
    • G11B7/13G11B7/00G11B7/125G11B19/06H01S5/026
    • G11B19/06
    • An optical integrated device includes a light source, a light-receiving element, a signal processing section, and a sleep control circuit. The light source irradiates a light beam onto an optical recording medium. The light-receiving element receives a reflected light of the light beam from the optical recording medium and outputs an electrical signal according to the reflected light. The signal processing section performs predetermined processing on the electrical signal outputted from the light-receiving element. The sleep control circuit is connected to a terminal which outputs a signal indicating the operation voltage of the light source, and controls whether to put the signal processing section in an operation state or a low power consumption state based on the voltage at the terminal.
    • 光学集成装置包括光源,光接收元件,信号处理部分和睡眠控制电路。 光源将光束照射到光记录介质上。 光接收元件从光记录介质接收光束的反射光,并根据反射光输出电信号。 信号处理部对从光接收元件输出的电信号进行预定处理。 睡眠控制电路连接到输出指示光源的操作电压的信号的端子,并且基于端子处的电压来控制是否将信号处理部分置于操作状态或低功耗状态。