基于响应曲面建模的LS频段VCO优化设计

Optimization Design of a LS-Band VCO Based on Response Surface Modeling

提出了一种采用响应曲面(RSM)协同优化压控振荡器(VCO)的功耗、相位噪声的方法。以差分耦合LC-VCO电路为实验设计对象,在电路结构上增加级联交叉耦合负阻管结合外部电流镜偏置,改进了相位噪声和功耗性能。在此基础上,建立VCO性能的响应曲面模型,优化并选取最佳电路设计参数的组合,获取最佳性能。基于TSMC CMOS 65nm、1.8VRF工艺的实验结果表明,优化后的VCO各项性能指标均显著提升。该VCO的调谐范围达2.377GHz~2.583 GHz,即206MHz,相位噪声为-113.44dBc/Hz@1MHz,功耗低至0.66mW,FoM值达184.27 dBc/Hz。该LS频段VCO适用于WiFi、物联网等无线通信中射频收发集成电路。

A response surface methodology(RSM)based optimization method for improving the performance of a LS-band voltage controlled oscillator(VCO)was proposed.A LC-VCO circuit was designed as an optimization target,and the phase noise and power dissipation were improved by employing cascade cross-coupled transistors as load-resistance and an external current mirror bias.Furthermore,the RS model was constructed by fitted data based on circuit simulations,then the best design parameters and the corresponding electric performance could be obtained as the optimal solution.Based on TSMC CMOS 65nm/1.8 V RF process,the final results showed that all performances of the proposed VCO were improved significantly after optimization.The VCO had a tuning range of 2.377GHz~2.583GHz,i.e.206MHz,aphase noise of-113.44dBc/Hz@1MHZ,and a power consumption lower than 0.66mW.The FoM value could reach 184.27dBc/Hz.The proposed LS-band VCO could be applied to the RF transceiver integrated circuits in WiFi,Internet of Things(IoT)and other wireless communications.