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    • 2. 发明授权
    • Time-to-digital converter and all digital phase-locked loop including the same
    • 时间到数字转换器和所有数字锁相环包括相同的
    • US08344772B2
    • 2013-01-01
    • US12956498
    • 2010-11-30
    • Ja Yol LeeSeon Ho HanMi Jeong ParkJang Hong ChoiSeong Do KimHyun Kyu Yu
    • Ja Yol LeeSeon Ho HanMi Jeong ParkJang Hong ChoiSeong Do KimHyun Kyu Yu
    • H03L7/06
    • H03L7/095G04F10/005H03L7/085H03L7/103H03L2207/50
    • An all digital phase-locked loop (ADPLL) includes: a phase counter accumulating a frequency setting word value and the phase of a digitally controlled oscillator (DCO) clock and detecting a fine phase difference between a reference clock and a retimed clock; a phase detector detecting a digital phase error value compensating for a phase difference between the frequency setting word value and the DCO clock according to the fine phase difference to detect a digital phase error value; a digital loop filter filtering the digital phase error value and controlling PLL operational characteristics; a lock detector generating a lock indication signal according an output of the digital loop filter; a digitally controlled oscillator varying the frequency of the DCO clock according to the output from the digital loop filter; and a retimed clock generator generating the retimed clock by retiming the DCO clock at a low frequency.
    • 全数字锁相环(ADPLL)包括:相位计数器累积频率设定字值和数字控制振荡器(DCO)时钟的相位,并检测参考时钟和重新定时钟之间的精细相位差; 相位检测器,根据所述精细相位差检测补偿所述频率设定字值与所述DCO时钟之间的相位差的数字相位误差值,以检测数字相位误差值; 数字环路滤波器滤除数字相位误差值并控制PLL的操作特性; 锁定检测器,根据数字环路滤波器的输出产生锁定指示信号; 数字控制振荡器根据数字环路滤波器的输出改变DCO时钟的频率; 以及重新计时的时钟发生器,通过以低频再定时DCO时钟产生重定时钟。
    • 9. 发明授权
    • 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
    • US07933369B2
    • 2011-04-26
    • US11635197
    • 2006-12-07
    • Jang Hong ChoiSeong Do KimHyun Kyu Yu
    • Jang Hong ChoiSeong Do KimHyun Kyu 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。