论述了一种全数字化倍频电路的设计，并对电路的精度及工作特性进行了详细分析．该倍频器可工作在低频范围内，通过改变时钟频率，也能够工作在高频段范围．它具有捕捉速度快、跟踪精度高、相位误差小、线路简单、工作可靠等特点．与一般数字倍频器相比其误差减小一倍、输入频率范围增大一倍． The design of an all-digital frequency multiplier circuit is discussed, and the precision and operating characteristics of the circuit are analyzed in detail. The frequency multiplier can work in the low frequency range, by changing the clock frequency, but also able to work in the high frequency range. It has the advantages of fast capture, high tracking accuracy, small phase error, simple circuit and reliable working. Compared with the general digital doubler, its error is reduced by one time and the input frequency range is doubled.