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    • 83. 发明申请
    • Apparatus and method for correcting duty cycle of clock signal
    • 用于校正时钟信号占空比的装置和方法
    • US20080169855A1
    • 2008-07-17
    • US11809971
    • 2007-06-04
    • Won-Hwa ShinSung-Man ParkKwang-Il Park
    • Won-Hwa ShinSung-Man ParkKwang-Il Park
    • H03K3/017
    • H03K5/1565
    • An apparatus for correcting a duty cycle of an input clock signal to generate a digitally corrected clock signal includes a duty cycle detector, an analog duty cycle correcting unit, and a digital duty cycle correcting unit. The duty cycle detector generates a duty cycle signal indicating a respective duty cycle of the digitally corrected clock signal. The analog duty cycle correcting unit adjusts a current flowing through a node to adjust the respective duty cycle of the input clock signal for generating an analog corrected clock signal at the node. The digital duty cycle correcting unit adjusts the respective duty cycle of the analog corrected clock signal according to the duty cycle signal for generating the digitally corrected clock signal.
    • 用于校正输入时钟信号的占空比以产生经数字校正的时钟信号的装置包括占空比检测器,模拟占空比校正单元和数字占空比校正单元。 占空比检测器产生指示数字校正的时钟信号的相应占空比的占空比信号。 模拟占空比校正单元调节流过节点的电流,以调整输入时钟信号的相应占空比,以在节点处产生模拟校正时钟信号。 数字占空比校正单元根据用于产生经数字校正的时钟信号的占空比信号来调整模拟校正时钟信号的相应占空比。
    • 85. 发明授权
    • Duty cycle correction circuit and a method for duty cycle correction in a delay locked loop using an inversion locking scheme
    • 使用倒置锁定方案的延迟锁定环中的占空比校正电路和占空比校正方法
    • US07183824B2
    • 2007-02-27
    • US11235646
    • 2005-09-26
    • Kwang-Il ParkHyun-Dong KimMi-Jin Lee
    • Kwang-Il ParkHyun-Dong KimMi-Jin Lee
    • H03K3/017
    • G11C11/15G11C11/5607H03K5/133H03K5/1565H03L7/0812H03L7/0891
    • Provided are a duty cycle correction circuit and method for duty cycle correction in a delay locked loop using an inversion locking scheme. The duty cycle correction circuit comprises: a correction unit exchanging and receiving a first duty correction signal and a second duty correction signal and selecting and receiving one of an input clock signal and an inversion signal of the input clock signal in response to an inversion locking signal, and correcting the duty cycle of the received input clock signal or inversion signal of the input clock signal in response to the first and second duty correction signals; a buffer buffering an output signal of the correction unit and outputting the buffered signal as a corrected clock signal; and a duty detector selecting and receiving one of the corrected clock signal and an inversion signal of the corrected clock signal in response to the inversion locking signal, and generating the first and second duty correction signals using the received corrected clock signal or inversion signal of the corrected clock signal.
    • 提供了一种使用反转锁定方案的延迟锁定环中的占空比校正电路和方法。 占空比校正电路包括:校正单元,响应于反相锁定信号,交换和接收第一占空比校正信号和第二占空比校正信号,并选择和接收输入时钟信号和反相信号之一 并且响应于第一和第二占空比校正信号,校正接收到的输入时钟信号的占空比或输入时钟信号的反相信号; 缓冲校正单元的输出信号并输出​​缓冲信号作为校正时钟信号的缓冲器; 以及负载检测器,其响应于所述反相锁定信号选择和接收所述经校正的时钟信号中的一个和所述经校正的时钟信号的反相信号,以及使用所接收的校正时钟信号或所述反相信号产生所述第一和第二占空比校正信号 校正时钟信号。
    • 88. 发明授权
    • Squelch circuit to create a squelch waveform for USB 2.0
    • US06653892B2
    • 2003-11-25
    • US10226057
    • 2002-08-22
    • Kwang-Il Park
    • Kwang-Il Park
    • G06G712
    • G06F13/4077
    • Disclosed is a squelch circuit capable of detecting whether an absolute value of input voltage is over a specific voltage difference or not. The squelch circuit according to the present invention comprises: a first differential amplifier for receiving first and second input signals, for sensing a first voltage difference between the first and second input signals and for outputting a first sensing signal when the first voltage difference is over a specific positive value; a second differential amplifier for receiving the first and second input signals, for sensing a second voltage difference between the first and second input signals and for outputting a second sensing signal when the second voltage difference is over a specific negative value; an offset current determining unit coupled to the first and second differential amplifiers for respectively controlling first and second offset currents of the first and second differential amplifiers to determine the specific positive and negative values; and an output unit for outputting a squelch signal in response to the first and second sensing signals.