通过分析频率综合器的完整三阶闭环s域模型,同时采用根轨迹分析技术,定量分析了工艺、电压和温度引起的环路参数变化对频率综合器稳定性的影响,并提出变化裕量的概念来进行稳定性分析和参数设计.为了获得更加稳定的系统,在电荷泵中设计了结构简单的电流单元用于补偿额外的参数变化,并采用线性压控增益的VCO来减小参数的变化.最后设计了一个分辨率为250kHz,频率范围为1~1.05GHz的集成频率综合器来验证上述的分析和设计方法. By analyzing the complete third-order closed-loop s-domain model of the frequency synthesizer and using the root locus analysis technique, the influences of the process parameters, voltage and temperature on the stability of the frequency synthesizer are quantitatively analyzed, and the variation margin Concept for stability analysis and parameter design.In order to obtain a more stable system, a simple structure of the current cell is designed in the charge pump to compensate for the additional parameter changes, and the use of a linear voltage-controlled gain VCO to reduce the change of parameters Finally, an integrated frequency synthesizer with a resolution of 250 kHz and a frequency range of 1 ~ 1.05 GHz was designed to verify the above analysis and design method.