pll锁相环分频原理
时间: 2023-09-05 11:12:42 浏览: 121
PLL锁相环的分频原理是通过反馈环路中的相位比较器来实现的。这个相位比较器会比较输入信号和输出信号的相位差,并产生一个错误信号。这个错误信号经过滤波器处理后,作为控制信号输入到VCO(Voltage Controlled Oscillator)中,用于调整VCO的频率。当输入信号的频率与VCO的频率相等时,相位比较器的输出误差为零,VCO的频率也保持稳定。如果输入信号的频率高于VCO的频率,相位比较器会产生一个正的错误信号,使VCO的频率增加,直到两者相等为止。相反,如果输入信号的频率低于VCO的频率,相位比较器会产生一个负的错误信号,使VCO的频率减小,直到两者相等为止。通过不断调整VCO的频率,PLL锁相环可以实现输入信号的精确分频。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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