说明：  基于CD4046构成的PLL及应用 CD4046构成的PLL在通信、频率处理、自动控制等技术领域中应用较为广泛，正确理解CD4046对掌握电路基本组成、原理及应用。对处理实际工程问题有很大帮助
(based on the PLL constitute CD4046 and CD4046 constitute the application of the PLL communications, frequency processing, automatic control technology has been widely applied. CD4046 correct understanding of the basic circuit master composition, theory and application. Dealing with practical engineering problems will be of great help)