短波跳频电台频率合成器的设计

Design of Frequency Synthesizer for Short-wave Frequency-hopping Transceiver

本文对比分析了现在广泛应用的几种频率合成技术，根据短波跳频电台的技术特点，实现了一种直接数字频率合成(DDS)+锁相环路(PLL)频率合成器的设计。它采用DDS输出作为PLL参考源的方法，实现了短波电台100Hz的频率间隔以及跳频系统所要求的快速频率转换和低相位噪声的统一。

This paper, on the basis of comparison and analysis on the existing widely-usedfrequency synthesizers, and on the tech features of short-wave frequency hopping trans-ceiver, presents a design of frequency synthesizer based on direct digital frequency(DDS) plus phase-locked loop (PPL). The DDS output is used for PLL referencesource to generate 100Hz frequency interval and the compromise between quick frequencyconversion need for hopping and low phase noise.