针对汽车音响收音数字调谐系统的实例,介绍一种广播用双波段锁相环频率合成电路的设计方法。该设计采用串行端口按位传输数据的方式,在程序分频器部分使用吞脉冲技术,不仅简化了控制器的操作,而且获得了较高的频率分辨率,具有广泛的市场前景。 Aiming at the example of digital tuned system for car stereo radio, a design method of dual-band PLL frequency synthesis circuit for broadcast is introduced. The design uses a serial port bit-by-bit data transmission method, the use of swallow pulse in the program divider section, not only simplifies the operation of the controller, but also to obtain a higher frequency resolution, has a broad market prospect.