摘要
针对单级宽带低噪声放大器(LNA)非线性难以定量分析及难以将电路与线性指标联合设计的问题,提出利用Volterra级数和双极非线性模型相结合的方法优化电路线性度。该方法从SiGe双极管非线性模型出发,提取影响线性度的模型参数,并利用维塔里级数和双极管非线性模型导出器件非线性传输函数,推演出其与IIP3的相互关系,量化各个参数的非线性比重,提出优化线性度的电路设计方法。研究结果表明,在1.5~20 GHz的宽频工作频带下,单级低噪声放大器的输入和输出均可实现良好的匹配(【-10 d B),达到16d B的增益,噪声系数在整个频带下小于3.6 d B,IIP3可达-7.73 d Bm。
A new circuit-linearity optimization approach combing Volterra series and bipolar non-linear model was proposed. SiGe bipolar non-linear model was introduced and model parameters affecting linearity were extracted. Device non-linear transfer functions were derived using Volterra series and bipolar non-linear model and its relationship with IIP3 was obtained,qualifying corresponding non-linear weight among these parameters. A circuit design method ensuring good linearity was proposed. Results showed that in the operating broad band of 1. 5 ~ 20 GHz the proposed one-stage LNA can have good input and output matches( less than-10 d B) as well as gain of16 d B. Noise figure was below 3. 6 d B and IIP3 can achieve-7. 73 d Bm across the whole band.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2014年第S1期171-176,共6页
Journal of Sichuan University (Engineering Science Edition)
基金
国家自然科学基金资助项目(61306033
61076101
61204092)
