摘要
报道了自行设计并研制成功的X波段低噪声放大器(LNA)模块,提出了调整模块增益平坦度的有效方法,即在两级放大器之间设计多个并联谐振回路,使其在带外低频段产生不同的谐振点来衰减低频段的增益,同时拉低带内低频端的增益,再用谐振回路中的串并联电阻调整增益压缩的大小,从而使工作频带内增益平坦.利用这种方法研制的模块最终测试结果为:增益平坦度≤±0.34dB,噪声系数≤1.84dB,增益>35dB,模块性能完全符合设计要求.
An X-band low noise amplifier （LNA） module is designed and manufactured successfully,and an effective method for adjusting the gain flatness of the module is presented. The method entails placing several parallel resonant circuits be-tween two low noise amplifier chips, providing different resonant frequency points at lower frequencies outside of the work-ing band. It reduces the gain of the lower frequencies of the working band. The gain compression can be controlled by resis-tors added in the resonant circuits. As a result,flat gain is obtained using this method. This X-band LNA module shows a gain flatness of less than ±0.34dB,a noise figure less than 1.84dB,and a gain higher than 35dB.
