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    • 2. 发明申请
    • Apparatus for automatically measuring a relatively wide range of leakage currents
    • 用于自动测量相对宽范围的漏电流的装置
    • US20050088196A1
    • 2005-04-28
    • US10929807
    • 2004-08-30
    • In ChoiDong LeeJeong AhnGil JungJang Choi
    • In ChoiDong LeeJeong AhnGil JungJang Choi
    • G01R31/02G01R19/25G01R31/12
    • G01R19/2513G01R31/1245
    • A leakage current measurement apparatus for measuring leakage currents is disclosed. The leakage current measurement apparatus automatically selects one of non-inductive shunt resistors of 10Ω, 100Ω, and 1000Ω and measures leakage currents of an outdoor isolation material for an ultra-high voltage. Additionally, the leakage current measurement apparatus is capable of measuring a relatively wide range of leakage currents with a relatively high precision, even at a remote location, as a measurement range is automatically adjusted within measurement ranges preset by a user when leakage currents of an outdoor isolation material change, and being protected against a surge possibly generated by an ultra-high voltage. Also, it can remotely measure in real-time leakage currents of an outdoor isolation material installed at a remote location over Ethernet.
    • 公开了一种用于测量泄漏电流的泄漏电流测量装置。 泄漏电流测量装置自动选择10mega,100Omega和1000Omega的非感性并联电阻器,并测量超高压室外隔离材料的漏电流。 此外,即使在远程位置,泄漏电流测量装置能够以相对较高的精度测量相对宽的泄漏电流范围,因为在用户在室外的泄漏电流下由用户预设的测量范围内自动调节测量范围 隔离材料变化,并被防止可能由超高电压产生的浪涌。 此外,它可以通过以太网远程测量安装在远程位置的室外隔离材料的实时泄漏电流。
    • 4. 发明申请
    • Apparatus for automatic gain control and wireless receiver employing the same
    • 用于自动增益控制的装置和采用该装置的无线接收器
    • US20070076828A1
    • 2007-04-05
    • US11635197
    • 2006-12-07
    • Jang ChoiSeong KimHyun Yu
    • Jang ChoiSeong KimHyun Yu
    • H04L27/08
    • H04L27/0002H03G3/001H03G3/3068
    • Provided is an apparatus for automatic gain control (AGC) widely used in a receiver of a wireless communication system. The receiver of a wireless communication system includes: a step variable gain amplifier and an analog variable gain amplifier disposed in the path of a wireless signal and amplifying the wireless signal; an analog gain control unit for generating a gain control voltage for feedback-controlling an amplification value of the analog variable gain amplifier; a digital gain control unit for receiving the control voltage and generating a digital code determining an amplification value of the step variable gain amplifier. The apparatus for AGC constituted as described above can reduce power consumption and the number of devices by efficiently running an AGC loop in an analog domain, and can be embodied at low cost in a structure appropriately controlling the step gain amplifier and the analog gain amplifier.
    • 提供了广泛用于无线通信系统的接收机中的自动增益控制(AGC)的装置。 无线通信系统的接收机包括:设置在无线信号的路径中的步进可变增益放大器和模拟可变增益放大器,并放大无线信号; 模拟增益控制单元,用于产生用于反馈控制模拟可变增益放大器的放大值的增益控制电压; 数字增益控制单元,用于接收控制电压并产生确定阶跃可变增益放大器的放大值的数字代码。 如上所述构成的AGC装置可以通过有效地运行模拟域中的AGC环路来降低功耗和装置数量,并且可以在适当地控制步进增益放大器和模拟增益放大器的结构中以低成本实现。