七十年代以来,锁相式频率合成器作为发射机的激励器、接收机的本振源,在无线通信设备中得到广泛应用。其主要特点是:①频率稳定度,准确度高。②频谱纯。③大部分电路数字化、集成化。④调谐速度快;选择频率不寻找、不微调,近年来,应用微处理器实现频率控制自动化,并能适应跳频通信。30MHz以上的无线通信广泛采用调频制,对调频设备 Since the seventies, phase-locked frequency synthesizer as a transmitter stimulator, the receiver’s local oscillator, wireless communication devices are widely used. Its main features are: ① frequency stability, high accuracy. ② pure spectrum. ③ most of the circuit digital, integrated. ④ tuning speed; select the frequency is not looking, not fine-tuning, in recent years, the application of microprocessor frequency control automation, and can adapt to frequency hopping communications. More than 30MHz wireless communication widely used FM system, FM equipment