一种新数字锁相环

A Novel Phase Locked Loop

设计了一种用于通信系统载波同步的新数字锁相环。新锁相环在传统的锁相环基础上添加了一条由快速付立叶变换、频率估计、频率电压转换构成的支路,在必要时这条支路会强制调节压控振荡器的振荡频率。试验结果表明,与传统的锁相环相比,新锁相环的捕获时间缩短了,同步带也增宽了。新数字锁相环适合于有微处理器的数字电路实现。

A novel all-digital phase locked loop （PLL）, applied to the carrier synchronization of communication systems, is designed. The novel PLL, based on the traditional PLL has an additional sub-circuit, which consists of Fast Fourier Transformation （FFT）, frequency estimation and the conversion of frequency into voltage, and would be coerced into adjusting the oscillation frequency of its Voltage Controlled Oscillator （VCO） if necessary. The experiment results show that its capture time is shortened and its synchronous frequency range approximately increased in comparison with the traditional PLL. This novel PLL is suitable for implementation by digital circuits with a microprocessor.