The optimized design and performance of the circuit of sampling phase - locked frequency synthesizer in microwave high - stability frequency - synthesizing technology are researched for the high demand of microwave frequency source 针对卫星电视接收机中微波高稳定本振源的要求，重点研究了取样锁相频率合成器电路的优化设计及性能。
Then high frequency distinguished rate and much low spurs could be realized in a single loop pll frequency synthesizer to carry out many kinds of digital modulation and predigest the structure of many signal generators 并能方便实现各种数字调制,大大简化各种信号发生器的结构,成为一种先进的锁相频率合成方式,得到广泛的应用。
The components used in the system project are detailed analyzed . all the parts contributed to phase noise are discussed as emphases . this millimeter wave frequency synthesizer has better phase noise and wider band 本文详细分析了本系统方案及其特性，并对其中用到的锁相环路各部件及其对系统相位噪声性能的影响作了重点讨论。
4 . respective scheme , layout design , simulation and optimization during debugging are implemented for key modules including dual frequency synthesizer , low noise amplifier in receiver and power amplifier in transmitter 3 .讨论了扩频通信的相关理论,对系统误码性能进行理论分析并进行了系统链路估算,得到电路实现的关键模块。
Through the research of direct digital synthesizer ( dds ) used as a divider in phase lock loop ( pll ) , a frequency synthesizer with small frequency resolution ratio and high purity frequency spectrum can be realized 摘要通过对直接数字合成器在锁相环路中作为分频器应用的研究，使频率合成器可以在实现超细频率分辨率的同时达到高的频谱纯度。
