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    • 3. 发明申请
    • LOCK DETECTOR AND METHOD OF DETECTING LOCK STATUS FOR PHASE LOCK LOOP
    • 锁定检测器和检测锁相状态的方法
    • US20130120035A1
    • 2013-05-16
    • US13297658
    • 2011-11-16
    • Feng Wei KUOKyle YENHuan-Neng CHENYen-Jen CHENChewn-Pu JOU
    • Feng Wei KUOKyle YENHuan-Neng CHENYen-Jen CHENChewn-Pu JOU
    • H03L7/08
    • H03L7/095
    • A lock detector for a PLL circuit includes a first signal counting circuit, a second signal counting circuit, a comparator, and a lock status unit. The first signal counting circuit is configured to define a plurality of observation periods according to a first oscillating signal and a predetermined cycle value. The second signal counting circuit is configured to determine a maximum counter value according to a second oscillating signal within each of the observation periods, and the second oscillating signal is generated in relation to the first oscillating signal. The comparator is configured to determine, for each of the observation periods, whether the maximum counter value equals the predetermined cycle value. The lock status unit is configured to generate a lock signal based on the maximum counter value being equal to the predetermined cycle value for a predetermined number of consecutive ones of the observation periods.
    • 用于PLL电路的锁定检测器包括第一信号计数电路,第二信号计数电路,比较器和锁定状态单元。 第一信号计数电路被配置为根据第一振荡信号和预定周期值来定义多个观察周期。 第二信号计数电路被配置为根据每个观测周期内的第二振荡信号来确定最大计数器值,并且相对于第一振荡信号产生第二振荡信号。 比较器被配置为为每个观察周期确定最大计数器值是否等于预定周期值。 锁定状态单元被配置为基于最大计数器值等于预定数量的连续观察周期中的预定周期值的锁定信号。
    • 6. 发明授权
    • Method and apparatus for amplifying a time difference
    • 用于放大时差的方法和装置
    • US08476972B2
    • 2013-07-02
    • US12813620
    • 2010-06-11
    • You-Jen WangShen-Iuan LiuFeng Wei KuoChewn-Pu JouFu-Lung Hsueh
    • You-Jen WangShen-Iuan LiuFeng Wei KuoChewn-Pu JouFu-Lung Hsueh
    • G06G7/12G06G7/26
    • G04F10/005
    • A time amplifier circuit has first and second inverters and first and second pull-down paths. Each inverter includes a first NMOS transistor and a first PMOS transistor. A source of the first NMOS transistor is coupled to a ground node directly or through a first additional NMOS transistor having a gate coupled to a respective input node. The first and second inverters are coupled to first and second input nodes and to first and second output nodes, respectively. The first pull-down path is from the first output node to the ground node and is enabled in response to the first input signal and the second output signal being high. The second pull-down path is from the second output node to ground and is enabled in response to the second input signal and the first output signal being high.
    • 时间放大器电路具有第一和第二反相器以及第一和第二下拉通路。 每个反相器包括第一NMOS晶体管和第一PMOS晶体管。 第一NMOS晶体管的源极直接或通过具有耦合到相应输入节点的栅极的第一附加NMOS晶体管耦合到接地节点。 第一和第二反相器分别耦合到第一和第二输入节点以及第一和第二输出节点。 第一下拉路径从第一输出节点到接地节点,并且响应于第一输入信号而使第二输出信号为高。 第二下拉路径从第二输出节点到地,并且响应于第二输入信号并且第一输出信号为高而使能。
    • 7. 发明授权
    • System and method for RC calibration using phase and frequency
    • 使用相位和频率进行RC校准的系统和方法
    • US08314652B2
    • 2012-11-20
    • US12777293
    • 2010-05-11
    • Feng Wei KuoTsung-Hsien TsaiJia-Liang Chen
    • Feng Wei KuoTsung-Hsien TsaiJia-Liang Chen
    • H03B1/00
    • H03H11/12
    • An RC filter is calibrated to a desired cutoff frequency by initializing the filter with a cutoff frequency. An input signal is filtered by the RC filter to provide a filter output signal having phase and frequency values. The cutoff frequency of the RC filter is adjusted based on the phase and frequency values of the filter output signal if the phase and frequency values do not satisfy a predetermined condition. The filtering and adjusting are repeated until the phase and frequency values of the filter output signal satisfy the predetermined condition. A calibration apparatus has a frequency generator, a resistor-capacitor (RC) filter, a phase comparator, a frequency detector, and a state machine. The phase comparator, frequency detector, and state machine are configured to calibrate the RC filter to a cutoff frequency specified by the reference signal based on a filter output signal of the RC filter.
    • 通过用截止频率初始化滤波器,将RC滤波器校准为所需的截止频率。 输入信号由RC滤波器滤波,以提供具有相位和频率值的滤波器输出信号。 如果相位和频率值不满足预定条件,则根据滤波器输出信号的相位和频率值来调整RC滤波器的截止频率。 重复滤波和调整直到滤波器输出信号的相位和频率值满足预定条件。 校准装置具有频率发生器,电阻 - 电容(RC)滤波器,相位比较器,频率检测器和状态机。 相位比较器,频率检测器和状态机被配置为基于RC滤波器的滤波器输出信号将RC滤波器校准到由参考信号指定的截止频率。
    • 8. 发明申请
    • METHOD AND SYSTEM FOR TIME TO DIGITAL CONVERSION WITH CALIBRATION AND CORRECTION LOOPS
    • 使用校准和校正灯进行数字转换的方法和系统
    • US20120056769A1
    • 2012-03-08
    • US12874462
    • 2010-09-02
    • You-Jen WANGShen-Iuan LIUFeng Wei KUOChewn-Pu JOUFu-Lung HSUEH
    • You-Jen WANGShen-Iuan LIUFeng Wei KUOChewn-Pu JOUFu-Lung HSUEH
    • H03M1/50
    • G04F10/005
    • Methods and apparatuses for time to digital conversion (TDC) are disclosed. A timing circuit comprises a TDC circuit, a calibration module, and a correction module. The TDC circuit is configured to provide a timing signal indicative of a timing difference between edges of a periodic reference clock signal and a variable feedback signal. The TDC circuit is also configured to provide a delay signal that is variably delayed relative to the reference clock signal. The calibration module is configured to provide a calibration signal to increase and decrease a total delay of the TDC circuit based on a time delay of the calibration signal plus a time delay of a correction signal. The correction module, which is configured to receive the timing signal and provide the correction signal, minimizes harmonic spurs in a frequency response of the timing signal by operating at a frequency of the reference clock signal.
    • 公开了时间到数字转换(TDC)的方法和装置。 定时电路包括TDC电路,校准模块和校正模块。 TDC电路被配置为提供指示周期性参考时钟信号的边沿与可变反馈信号之间的定时差的定时信号。 TDC电路还被配置为提供相对于参考时钟信号可变地延迟的延迟信号。 校准模块被配置为提供校准信号,以根据校准信号的时间延迟加上校正信号的时间延迟来增加和减少TDC电路的总延迟。 被配置为接收定时信号并提供校正信号的校正模块通过在参考时钟信号的频率下工作来最小化定时信号的频率响应中的谐波杂散。
    • 9. 发明申请
    • METHOD AND APPARATUS FOR AMPLIFYING A TIME DIFFERENCE
    • 用于放大时间差异的方法和装置
    • US20110304372A1
    • 2011-12-15
    • US12813620
    • 2010-06-11
    • You-Jen WANGShen-Iuan LIUFeng Wei KUOChewn-Pu JOUFu-Lung HSUEH
    • You-Jen WANGShen-Iuan LIUFeng Wei KUOChewn-Pu JOUFu-Lung HSUEH
    • H03H11/26
    • G04F10/005
    • A time amplifier circuit has first and second inverters and first and second pull-down paths. Each inverter includes a first NMOS transistor and a first PMOS transistor. A source of the first NMOS transistor is coupled to a ground node directly or through a first additional NMOS transistor having a gate coupled to a respective input node. The first and second inverters are coupled to first and second input nodes and to first and second output nodes, respectively. The first pull-down path is from the first output node to the ground node and is enabled in response to the first input signal and the second output signal being high. The second pull-down path is from the second output node to ground and is enabled in response to the second input signal and the first output signal being high.
    • 时间放大器电路具有第一和第二反相器以及第一和第二下拉通路。 每个反相器包括第一NMOS晶体管和第一PMOS晶体管。 第一NMOS晶体管的源极直接或通过具有耦合到相应输入节点的栅极的第一附加NMOS晶体管耦合到接地节点。 第一和第二反相器分别耦合到第一和第二输入节点以及第一和第二输出节点。 第一下拉路径从第一输出节点到接地节点,并且响应于第一输入信号而使第二输出信号为高。 第二下拉路径从第二输出节点到地,并且响应于第二输入信号并且第一输出信号为高而使能。