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    • 2. 发明申请
    • METHOD AND APPARATUS FOR REDUCING SPURS IN A FRACTIONAL-N SYNTHESIZER
    • 用于减少分数N合成器中的刺激的方法和装置
    • WO2009146344A1
    • 2009-12-03
    • PCT/US2009/045372
    • 2009-05-28
    • MOTOROLA, INC.GABATO, Manuel, P. Jr.BOZEKI, John, J.CHARASKA, Joseph, A.GAILUS, Paul, H.
    • GABATO, Manuel, P. Jr.BOZEKI, John, J.CHARASKA, Joseph, A.GAILUS, Paul, H.
    • H03L7/089H03L7/197
    • H03L7/1974H03L7/0893
    • A method and apparatus for reducing in-band spurs in a fractional-N synthesizer (100) includes generating a compensated current signal by a charge pump (108) coupled to a phase detector (106). The compensated current signal includes in-band spurs having frequencies within a frequency bandwidth associated with a loop filter (110). The method then includes selectively dithering the compensated current signal with a sufficient dither level to spread the frequencies of in-band spurs beyond the frequency bandwidth associated with the loop filter (110). The dithered compensated current signal is then passed through the loop filter (110) for filtering the in-band spurs having frequencies beyond the frequency bandwidth. The method then includes generating a voltage controlled oscillator (VCO) signal with reduced in-band spurs proportional to the filtered compensated current signal.
    • 用于减小分数N合成器(100)中的带内杂散的方法和装置包括通过耦合到相位检测器(106)的电荷泵(108)产生补偿的电流信号。 经补偿的电流信号包括具有与环路滤波器(110)相关联的频率带宽内的频率的带内杂散。 该方法然后包括以足够的抖动电平选择性地使经补偿的电流信号抖动,以将带内杂散的频率扩展到与环路滤波器(110)相关联的频率带宽之外。 抖动补偿电流信号然后通过环路滤波器(110),用于对频率超过频率带宽的带内杂散进行滤波。 该方法然后包括产生与经滤波的补偿电流信号成比例的减小的带内杂散的压控振荡器(VCO)信号。
    • 3. 发明申请
    • METHOD AND APPARATUS FOR SPUR REDUCTION IN A FREQUENCY SYNTHESIZER
    • 用于频率合成器中减少的方法和装置
    • WO2009042384A1
    • 2009-04-02
    • PCT/US2008/075698
    • 2008-09-09
    • MOTOROLA, INC.GAILUS, Paul, H.BOZEKI, John, J.CHARASKA, Joseph, A.DUBOV, VadimGABATO, Manuel, P., Jr.GONZALEZ, Armando, J.
    • GAILUS, Paul, H.BOZEKI, John, J.CHARASKA, Joseph, A.DUBOV, VadimGABATO, Manuel, P., Jr.GONZALEZ, Armando, J.
    • H03L7/197
    • H03L7/1974
    • A frequency synthesizer (100) includes: a frequency source generating a reference signal (107) that includes a plurality of pulses having periodicity based on a reference frequency; a feedback loop that includes, a phase detector circuit (119), a loop filter (120), a controlled oscillator (121) that generates an output signal at an output (112), and a loop divide circuit (122); a non-linear circuit element (103) at an input of the phase detector circuit (119), which generates intermodulation distortion that causes at least one spurious signal at the output; and a controller (106) controlling the loop divide circuit (122) and the non-linear circuit element (103). The frequency synthesizer further includes a dither circuit (101) that adjusts the timing of some of the pulses of the reference signal based on a parameter provided by the controller (106) to the non-linear circuit element (103), thereby, providing a jittered reference signal to the non- linear circuit element (103) for attenuating the at least one spurious signal at the output.
    • 频率合成器(100)包括:频率源,产生包括基于参考频率具有周期性的多个脉冲的参考信号(107); 一个反馈回路,包括相位检测器电路(119),环路滤波器(120),在输出端(112)产生输出信号的受控振荡器(121)和环路除电路(122); 在相位检测器电路(119)的输入处的非线性电路元件(103),其产生在输出端引起至少一个杂散信号的互调失真; 以及控制环路分割电路(122)和非线性电路元件(103)的控制器(106)。 频率合成器还包括抖动电路(101),其基于由控制器(106)提供给非线性电路元件(103)的参数来调整参考信号的一些脉冲的定时,从而提供一个 向非线性电路元件(103)抖动参考信号,用于衰减输出端的至少一个杂散信号。