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一、通信与频率选择频率合成器用于通信系统中,除了要便于选频外,还要求频谱纯度高,因为频率合成器的副波和边带噪声会直接影响到系统的质量。随着传输方式的改进,如单边带以及各种快速终端的发展,对通信系统的长、短期稳定度及信道容量的要求大大提高,因此,目前广泛开展着各种型式的频率合成器的研制,以适应各种通信接收机本振和发射机激励器的各种要求。在现代通信设备中,频率台成器是一个重要组成部分,它的特性直接关系到通信没
First, the communication and frequency selection Frequency synthesizer used in communication systems, in addition to facilitate the frequency selection, but also requires high spectral purity, because the frequency synthesizer and sideband noise will directly affect the quality of the system. With the improvement of transmission methods, such as the development of single-sidebands and various types of quick terminals, the requirements for the long-term and short-term stability and channel capacity of communication systems have been greatly raised. Therefore, various types of frequency synthesizers Developed to suit a wide range of communications receiver local oscillator and transmitter exciter requirements. In modern communications equipment, the frequency of Taiwan is an important component, its characteristics are directly related to the communication