随着通信行业的不断发展,通信设备要求越来越高,出现了越来越多的数字通信设备,这种设备中模拟信号与数字信号是通过ADC和DAC芯片来实现相互间的转换,而基站和终端间传输的是射频信号,由于目前这些芯片所能采集和输出的模拟信号不能够达到射频频率,所以就需要变频技术在通信设备中的应用。 With the continuous development of the communication industry, the requirements for communication equipment are getting higher and higher. More and more digital communication devices have appeared. In this device, the analog signals and digital signals are converted by the ADC and the DAC chip, The transmission between the base station and the terminal is a radio frequency signal. Since the analog signals that can be collected and output by these chips can not reach the radio frequency at present, the application of the frequency conversion technology in the communication equipment is needed.