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    • 9. 发明授权
    • PLL circuit
    • PLL电路
    • US08213560B2
    • 2012-07-03
    • US12382387
    • 2009-03-16
    • Kiyoshi MiuraMichiko Miura, legal representative
    • Kiyoshi Miura
    • H03D3/24
    • H03L7/183H03L7/0896H03L7/0898H03L7/093
    • Disclosed herein is a phase-locked loop circuit including: a voltage controlled oscillator; a variable frequency divider circuit for frequency-dividing an oscillating signal of the voltage controlled oscillator into a 1/N (N is an integer) frequency; a phase comparator circuit for comparing phases of a frequency-divided signal and a reference signal of a reference frequency with each other; a charge pump circuit for outputting a charge pump current changed in pulse width; a loop filter for being supplied with the charge pump current and outputting a direct-current voltage changed in level; and a control circuit for calculating a value of the charge pump current as a function of the oscillating frequency of the voltage controlled oscillator and a coefficient for setting a phase locked loop band, and setting the value of the charge pump current in the charge pump circuit.
    • 本文公开了一种锁相环电路,包括:压控振荡器; 用于将压控振荡器的振荡信号分频为1 / N(N是整数)频率的可变分频器电路; 相位比较器电路,用于比较分频信号和参考频率的参考信号的相位; 用于输出脉冲宽度变化的电荷泵电流的电荷泵电路; 用于提供电荷泵电流并输出电平变化的直流电压的环路滤波器; 以及控制电路,用于计算作为压控振荡器的振荡频率的函数的电荷泵电流的值和用于设定锁相环带的系数,并且设定电荷泵电路中的电荷泵电流的值 。