一种S波段平衡式限幅低噪声放大器的设计  

Design of an S-band Balanced Limiting Low Noise Amplifier

作　　者：张振[1] 范如东[1] 罗俊[1,2] 

机构地区：[1]中国电子科技集团公司第二十四研究所,重庆400060 [2]西安电子科技大学微电子学院,西安710071

出　　处：《微电子学》2012年第4期463-465,476,共4页Microelectronics

摘　　要：介绍了一种小型化平衡式限幅低噪声放大器。该放大器采用Lange桥平衡结构,在实现低噪声的同时,保证了小电压驻波比;在3.0～3.5GHz频带内,噪声系数小于1.3dB,输入输出驻波系数小于1.3,增益大于27dB,平坦度±0.6dB以内,输出1dB压缩点大于12dBm。该放大器能够承受最大5W的连续波功率输入,且大功率输入时的驻波系数小于1.3。A miniaturized balanced limiting low noise amplifier （LNA） was presented. In this circuit, Lange coupler was used to ensure both low noise figure and small voltage standing-wave ratio. Measured results showed that, in the frequency band from 3.0 GHz to 3.5 GHz, the LNA had a noise figure smaller than 1.3 dB, an input/ output voltage standing wave ratio less than 1.3, a gain above 27 dB, gain fluctuation within ＋0.6 dB, and 1-dB compression output power greater than 12 dBm. The amplifier survived from continuous-wave （CW） input power above 5 W when input voltage standing-wave ratio was below 1.3.

关 键 词：平衡式放大器 低噪声放大器 限幅放大器 

分 类 号：TN722.3[电子电信—电路与系统]