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    • 6. 发明申请
    • FRACTIONAL-N FREQUENCY SYNTHESIZER AND METHOD THEREOF
    • 其他N频率合成器及其方法
    • US20100321120A1
    • 2010-12-23
    • US12563903
    • 2009-09-21
    • Yoo Hwan KIMYoo Sam NaByeong Hak Jo
    • Yoo Hwan KIMYoo Sam NaByeong Hak Jo
    • H03L7/08
    • H03L7/1976H03L7/087
    • The present relates to a fractional-N frequency synthesizer improving noise characteristics and a method thereof. The fractional-N frequency synthesizer includes a reference oscillator that generates a reference frequency signal; a sigma-delta modulator that generates a desired decimal value based on the reference frequency signal; a divider that divides a voltage controlled oscillation frequency signal; first to M phase/frequency detectors that detect a difference in phase and frequency between the reference frequency signal and the divided voltage controlled oscillation frequency signal; first to M charge pumps that are connected to each of the phase/frequency detectors in series and charges or pumps charge amount according to output signals from each of the phase/frequency detectors; a loop filter that controls the amount of supplied current based on output signals from the charge pumps to filter low-pass frequency components; and a voltage controlled oscillator that is oscillated in response to the output signal from the loop filter and generates voltage controlled oscillation frequency signals.
    • 本发明涉及一种提高噪声特性的分数N频率合成器及其方法。 分数N频率合成器包括产生参考频率信号的参考振荡器; 基于所述参考频率信号产生所需十进制值的Σ-Δ调制器; 分压器,其分压电压控制的振荡频率信号; 首先检测参考频率信号和分压电压控制振荡频率信号之间的相位和频率差异的M相/频率检测器; 首先对M个串联的每个相位/频率检测器的泵进行充电,并根据来自每个相位/频率检测器的输出信号对电荷或泵充电量; 环路滤波器,其基于来自电荷泵的输出信号来控制供电电流量以滤除低通频率分量; 以及响应于来自环路滤波器的输出信号而振荡并产生压控振荡频率信号的压控振荡器。
    • 8. 发明申请
    • FREQUENCY GENERATOR
    • 频率发生器
    • US20090153256A1
    • 2009-06-18
    • US12129219
    • 2008-05-29
    • Byeong Hak JoYoo Sam Na
    • Byeong Hak JoYoo Sam Na
    • H03B21/01
    • H03L7/18
    • There is provided a feedback circuit including: an oscillator generating an oscillation frequency signal; a mixer unit having an input terminal, a feedback terminal, and an output terminal and outputting a frequency signal through the output terminal, the frequency signal obtained by adding or subtracting frequency of a feedback signal, input through the feedback terminal, to or from frequency of the oscillation frequency signal input through the input terminal from the oscillator; a first frequency divider dividing the frequency signal output from the mixer unit at a division ratio of N (N is a multiple of 2) to generate an output signal; and a feedback circuit adjusting the output signal of the first frequency divider for the first frequency divider to output a frequency signal in a desired band and feeding back the adjusted signal to the feedback terminal of the mixer unit.
    • 提供了一种反馈电路,包括:产生振荡频率信号的振荡器; 具有输入端子,反馈端子和输出端子的混频器单元,并且通过输出端子输出频率信号,通过将反馈信号的频率加到或减去通过反馈端子输入的频率或频率从频率 通过输入端从振荡器输入的振荡频率信号; 第一分频器,以N的分频比(N为2的倍数)分频从混频器单元输出的频率信号,以产生输出信号; 以及反馈电路,调整第一分频器的第一分频器的输出信号,以输出所需频带中的频率信号,并将调整后的信号反馈到混频器单元的反馈端。