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    • 4. 发明公开
    • Apparatus and methods for phase-locked loops with soft transition from holdover to reacquiring phase lock
    • 装置和方法用于从软过渡相位控制电路保持在通过相位耦合新请求
    • EP2903164A1
    • 2015-08-05
    • EP15153213.2
    • 2015-01-30
    • Hittite Microwave Corporation
    • Allan, Gordan JohnFortier, Justin L.
    • H03L7/14H03L7/10
    • H03L7/08H03L7/10H03L7/101H03L7/14H03L7/143H03L7/146H03L7/23
    • Provided herein are apparatus and methods for phase-locked loops (PLLs). In certain configurations, a clock system includes a PLL, a control circuit, and a holdover circuit that is electrically coupled to an input of the PLL's loop filter via a holdover switch and a variable resistor. The control circuit generates an input clock signal for the PLL based on a selected reference clock signal chosen from one or more reference clock signals. When the control circuit decides that the selected reference clock signal is unreliable, the control circuit disables the PLL's feedback loop and turns on the holdover switch. After the reference clock signal is changed or otherwise becomes reliable, the control circuit enables the PLL's feedback loop while keeping the holdover switch turned on, and controls a resistance of the variable resistor over time to provide a soft transition from holdover to reacquiring phase lock.
    • 中的装置和方法提供了一种用于锁相环路(PLL)。 在某些配置中,时钟系统包括:一个PLL,控制电路,和一个故障保持电路也设置在PLL的环路滤波器的输入经由故障保持开关和可变电阻器电耦合到。 所述控制电路生成基于来自一个或多个参考时钟信号中选择的选择的参考时钟信号的PLL输入时钟信号的速率。 当控制电路判定没有所选择的参考时钟信号是不可靠的,则控制电路禁止PLL的反馈环路和接通开关保持模式。 基准时钟信号被改变或以其他方式变为可靠之后,控制电路使PLL的反馈环路,同时保持故障保持开关接通,并控制可变电阻器超时的电阻,以提供到重新获得相位​​锁定从故障保持的软过渡。
    • 7. 发明公开
    • DATA PROCESSING DEVICE WITH MODULE FOR DETECTION AND ELIMINATION OF LOCAL OSCILLATOR SIGNAL DEGRADATION
    • BESEITIGUNG EINER LOKALOSZILLATORSIGNALVERSCHLECHTERUNG DATENVERARBEITUNGSVORRICHTUNG MIT MODUR ZUR DETEKTION
    • EP2988425A1
    • 2016-02-24
    • EP15181077.7
    • 2015-08-14
    • NXP B.V.
    • Kerselaers, AnthonyGommé, Liesbeth
    • H04B1/14H04B1/04H04B1/28
    • H04B1/1638H03B2201/03H03L7/085H03L7/095H03L7/101H04B1/0096H04B1/0475H04B1/14H04B1/28H04B17/29
    • One example discloses a data processing device, comprising: a local oscillator (LO) having an LO frequency output, an LO performance parameter output, and an LO frequency select input; and a degradation detection module, coupled to the LO performance parameter output and to the LO frequency select input, and including an LO frequency select module triggered by the LO performance parameter output. Another example discloses an article of manufacture comprises at least one non-transitory, tangible machine readable storage medium containing executable machine instructions for controlling a data processing device which comprise: monitoring a set of local oscillator (LO) performance parameters; setting an LO degraded state when at least one of the LO performance parameters is not within a predetermined range; and adjusting an LO frequency in response to the LO degraded state.
    • 一个实例公开了一种数据处理装置,包括:具有LO频率输出的本地振荡器(LO),LO性能参数输出和LO频率选择输入; 以及劣化检测模块,其耦合到LO性能参数输出和LO频率选择输入,并且包括由LO性能参数输出触发的LO频率选择模块。 另一个实例公开了一种制品,包括至少一个非暂时的,有形的机器可读存储介质,其包含用于控制数据处理装置的可执行机器指令,其包括:监视一组本地振荡器(LO)性能参数; 当所述LO性能参数中的至少一个不在预定范围内时,设置LO降级状态; 以及响应于LO退化状态来调整LO频率。