摘要
提出了一种基于低Q值匹配网络的超宽带低噪声放大器(LNA)的设计方法。该方法将LC滤波电路加入偏置电路中,以降低系统噪声同时调节匹配网络Q值;通过选择合适的反馈回路,提高LNA的带宽并调节匹配网路Q值;利用匹配电路结构及优化的Q值,解决了放大器频带窄、噪声高、增益低的问题。测试结果表明,在频段1.5 GHz^2.5 GHz内,其纹波特性低于1 dB,增益达到25 dB。将实测结果与仿真结果相比较,验证了该设计方法的合理性,与传统LNA设计方法相比,采用低Q值匹配网络的设计方法结构简单、性能优越,具有广泛的应用价值。
A novel LNA （ Low Noise Amplifier ） is proposed by using low Q value of matching network. The LC filtering circuit is merged in biasing circuit in order to reduce the noise of system and to monitor the Q value of the matching network in the design;By choosing the suitable feedback loop to raise the bandwidth of the LNA and to adjust the Q value of the matching network;By taking advantage of the structure of matching circuit and the optimization of the Q value,a few problems of Amplifier is settled down,such as the narrow bandwidth,the high noise and the low gain. The LNA is measured under the bandwidth of 1. 5 GHz ~2. 5 GHz, the ripple wave characteristic is lower than 1 dB,moreover the gain is 25 dB. The measured result is compared with the simulation result,it can be verified the design is reasonable. And the structure of the design method is simple and the performance is more superior,meanwhile the application is wide.
出处
《电子器件》
CAS
北大核心
2014年第4期635-639,共5页
Chinese Journal of Electron Devices
基金
河南省科技厅基础前沿研究项目(112300410144)
郑州市UWB实时定位系统院士工作站建设项目(131PYSGZ211)
河南省省院合作项目(122106000049)
