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    • 1. 发明授权
    • Auto frequency calibration for a phase locked loop and method of use
    • 锁相环的自动频率校准和使用方法
    • US08953730B2
    • 2015-02-10
    • US13452138
    • 2012-04-20
    • Yen-Jen ChenFeng Wei KuoHuan-Neng ChenChewn-Pu Jou
    • Yen-Jen ChenFeng Wei KuoHuan-Neng ChenChewn-Pu Jou
    • H03D3/24
    • H03L7/0802G04F10/005H03L7/085H03L7/093H03L7/0992H03L7/101H03L7/103H03L7/104H03L7/1976H03L2207/50H03M1/002H03M3/32
    • A phase locked loop includes a phase difference detector configured to receive a reference frequency and a divider frequency and output a phase difference signal. The phase locked loop includes a code generator configured to receive the reference frequency and the phase difference signal, and output a coarse tuning signal and a reset signal. The phase locked loop includes a digital loop filter configured to receive the phase difference signal and output a fine tuning signal. The phase locked loop includes a voltage control oscillator configured to receive the coarse and fine tuning signals, and output an output frequency. The phase locked loop includes a divider configured to receive the reset signal, a divider number control signal and the output frequency, and output the divider frequency. The phase locked loop includes a delta-sigma modulator configured to receive a divisor ratio and the reset signal, and output divider number control signal.
    • 锁相环包括被配置为接收参考频率和分频器频率并输出相位差信号的相位差检测器。 锁相环包括被配置为接收参考频率和相位差信号的码发生器,并输出粗调谐信号和复位信号。 锁相环包括配置为接收相位差信号并输出​​微调信号的数字环路滤波器。 锁相环包括配置成接收粗调和微调信号并输出​​输出频率的压控振荡器。 锁相环包括分配器,用于接收复位信号,分频器数控制信号和输出频率,并输出分频器。 锁相环包括被配置为接收除数比和复位信号的delta-sigma调制器,并输出分频数控制信号。
    • 3. 发明授权
    • Lock detector and method of detecting lock status for phase lock loop
    • 锁定检测器和检测锁相环锁定状态的方法
    • US08456207B1
    • 2013-06-04
    • US13297658
    • 2011-11-16
    • Feng Wei KuoKyle YenHuan-Neng ChenYen-Jen ChenChewn-Pu Jou
    • Feng Wei KuoKyle YenHuan-Neng ChenYen-Jen ChenChewn-Pu Jou
    • H03L7/06
    • 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。