基于锁相环技术的UHF频段宽带频率源设计

针对UHF频段的通信系统，研制了一种UHF频段的宽带频率源。采用锁相环频率合成的方法，通过对器件选型、参数设定、环路滤波器等关键部分详细分析的方式，完成了UHF频段频率源的设计。测试结果表明，该频率源的工作频率范围为300MHz-350MHz，步进频率为10kHz，杂散抑制优于45dBc，相位噪声优于50dBc/Hz@100kHz，输出功率大于-15dBm，各项指标满足实际工程应用要求。

Design of a Broadband Synthesizer of UHF-band Based on PLL

In view of the communication system of UHF-band, a broadband frequency source in UHF-band is designed. According to detailed analysis of the devices selection, parameter setting, loop filter and other key parts, a synthesizer of UHF-band is complemented based on the method of PLL frequency synthesis. The test results show that its frequency range is 300MHz~350MHz, step frequency is 10 kHz, spurious reduction is better than 60dBc, phase noise is better than 90dBc/Hz@100 kHz, output power is more than -15dBm, the indicators meet the practical engineering application requirements.