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    • 1. 发明申请
    • ALL DIGITAL PHASE LOCKED LOOP SYSTEM AND METHOD
    • 所有数字相位锁定系统和方法
    • US20070200638A1
    • 2007-08-30
    • US11624149
    • 2007-01-17
    • HARALD SANDNERHARALD PARZHUBER
    • HARALD SANDNERHARALD PARZHUBER
    • H03L7/00
    • H03L7/08H03L2207/50
    • An all digital PLL system generates an analog oscillator signal at intermediate frequencies to achieve averaged oscillator frequencies at an extremely high frequency resolution. The PLL system includes a digitally controlled oscillator (10) with a digital control input and an analog signal output, and a feedback loop with a digital loop filter (16) for generating a digital control signal for the digitally controlled oscillator (10). The digital loop filter (16) has a first output providing an integer part (nint) of the digital control signal and a second output providing a fractional part (nΣΔ) of the digital control signal. A sigma-delta modulator (14) has an input connected to the second output of the digital loop filter (16) and an output providing a one-bit digital output signal (ΣΔ), and a digital adder (12) has a first input connected to the first output of the digital loop filter (16), a second input connected to the output of the sigma-delta modulator (14), and an output connected to the digital control input of the digitally controlled oscillator (10). The output of the sigma-delta modulator (14) modulates the least significant bits from the first output of the digital loop filter (16).
    • 全数字PLL系统在中频产生模拟振荡器信号,以极高频率分辨率实现平均振荡器频率。 PLL系统包括具有数字控制输入和模拟信号输出的数字控制振荡器(10)和具有数字环路滤波器(16)的反馈回路,用于产生数字控制振荡器(10)的数字控制信号。 数字环路滤波器(16)具有第一输出,提供数字控制信号的整数部分(n int),第二输出提供小数部分(nSigmaDelta) 的数字控制信号。 Σ-Δ调制器(14)具有连接到数字环路滤波器(16)的第二输出的输入端和提供一比特数字输出信号(SigmaDelta)的输出,数字加法器(12)具有第一输入 连接到数字环路滤波器(16)的第一输出,连接到Σ-Δ调制器(14)的输出端的第二输入端和连接到数字控制振荡器(10)的数字控制输入端的输出端。 Σ-Δ调制器(14)的输出调制来自数字环路滤波器(16)的第一输出的最低有效位。