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捕捉带宽和同步带宽是锁相环路的重要性能指标,通过增加环路的直流总增益,例如在滤波器环节中,加大直流放大倍数,可以扩大捕捉和同步带宽,但直流放大器放大倍数过大,将容易引起漂移和压控振荡器(VCO)的饱和阻塞而使环路工作不稳定,并且还会降低环路的噪声性能.最近胡华春在文[1]中通过实验指出:将输入讯号同时注入到压控振荡器中(图1)可以大大增加环路的捕捉和同步带宽.本文用同步振荡理论和锁相原理导出了环路的基本方程,从而可以看到将输入讯号同时注入到压控振荡器中可以产生同步
Capturing bandwidth and synchronizing bandwidth is an important performance indicator of a phase-locked loop. By increasing the total DC loop gain, such as increasing the DC magnification in the filter loop, the capture and synchronization bandwidth can be increased, but the DC amp magnification Large, will easily lead to drift and saturation of voltage-controlled oscillator (VCO) blocking the loop work instability, and will also reduce the noise performance of the loop. Hu Hua Chun recently [1] in the experiment that: the input signal Simultaneously injected into the voltage-controlled oscillator (Figure 1) can greatly increase the loop capture and synchronization bandwidth.In this paper, the basic equations of the loop are derived using the theory of synchronous oscillation and the phase-locked principle, so that we can see that the input signal is simultaneously injected into Voltage-controlled oscillator can generate synchronization