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    • 1. 发明授权
    • Single ended preamplifier having multiple first stage banks for improved noise characteristics
    • 单端前置放大器具有多个第一级组,用于改善噪声特性
    • US06538832B1
    • 2003-03-25
    • US09589429
    • 2000-06-07
    • Indumini W. RanmuthuHong Jiang
    • Indumini W. RanmuthuHong Jiang
    • G11B509
    • H03F3/45991G11B5/012G11B5/09G11B2005/0016H03F3/45959
    • In hard disk drives (HDD), a magnetic read head moves over a portion of the hard disk when reading data. A preamplifier, having an initial amplification stage of the single ended type, connects to the magnetic read head and amplifies a data signal picked up by the magnetic read head. The preamplifier typically has multiple read heads, or channels. In order to reduce noise coming into the read channels of the preamplifier from the substrate capacitances of the input transistors connected to the read heads, the input transistors are grouped together into multiple banks that are multiplexed, or turn on separately. To further aid noise reduction, the poles of the single ended amplifier are matched, that is, the frequency response of the constant voltage side is matched to the frequency response to the signal side. This effectively reduces both ground noise and Vcc power supply noise as the the noise becomes common mode on the inputs to a differential amplifier that is connected to the single ended amplifier. Noise is further minimized by connecting the substrates of the switching transistors connected to the input transistors to magnetic read ground, as opposed to integrated circuit ground.
    • 在硬盘驱动器(HDD)中,当读取数据时磁读取头在硬盘的一部分上移动。 具有单端类型的初始放大级的前置放大器连接到磁读头并放大由磁读头读取的数据信号。 前置放大器通常具有多个读取头或通道。 为了减少从连接到读取头的输入晶体管的基板电容进入前置放大器的读取通道的噪声,输入晶体管被分组在多个组中,或分开开启。 为了进一步减少噪声,单端放大器的极点匹配,即恒压侧的频率响应与对信号侧的频率响应相匹配。 由于噪声成为连接到单端放大器的差分放大器的输入上的共模,因此这有效地降低了接地噪声和Vcc电源噪声。 与集成电路接地相反,将连接到输入晶体管的开关晶体管的基板连接到磁性读取地,进一步减小噪声。
    • 7. 外观设计
    • Book light
    • USD994175S1
    • 2023-08-01
    • US29869780
    • 2023-01-09
    • Hong Jiang
    • Hong Jiang
    • FIG. 1 is a front and top perspective view of a book light, showing my new design;
      FIG. 2 is a rear and bottom perspective view thereof;
      FIG. 3 is a front elevation view thereof;
      FIG. 4 is a rear elevation view thereof;
      FIG. 5 is a left side elevation view thereof;
      FIG. 6 is a right side elevation view thereof;
      FIG. 7 is a top plan view thereof;
      FIG. 8 is a bottom plan view thereof;
      FIG. 9 is an enlarged perspective view of detail “9” identified in FIG. 1;
      FIG. 10 is an enlarged perspective view of detail “10” identified in FIG. 1;
      FIG. 11 is an enlarged perspective view of detail “11” identified in FIG. 2; and,
      FIG. 12 is an enlarged perspective view of detail “12” identified in FIG. 2.
      The dashed lines in the figures illustrate portions of the book light that form no part of the claimed design. The dash dot dash lines in FIGS. 1, 2, 9, 10, 11 and 12 are for the purpose of illustrating the enlarged views indicators and form no part of the claimed design.