Aiming at the development of the BD,considering about advantages of dual-mode positioning and similarity of the BD's B1 band and GPS's L1 band,a design principle and its working method of a low-noise amplifier are described which is suitable for the BD's B1 band and GPS's L1 band,and a physical object is made,which gives the test result. To achieve better gain,it was used three cascaded manner. Finally,the low-noise amplifier designed has a gain of(38±0.5)dB in B1 band and L1 band,the input VSWR is less than 1.8,the output VSWR is less than 1.2,the noise figure is less than 0.65 dB,unconditional stability in the whole band. It can be used for the Beidou B1 band and GPS L1 band.%针对国内北斗行业的发展和双模定位的优点以及北斗B1频段和GPS相近的特点,给出了一种适用于北斗B1频段和GPS L1频段的低噪声放大器的设计原理和设计方法,并制作出实物,给出了测试结果.为了达到更好的增益,采用了3级级联的方式.设计出的低噪声放大器的在B1和L1频段内的增益(38±0.5)dB,输入驻波系数小于1.8,输出驻波系数小于1.2,噪声系数小于0.65 dB,在全频段内无条件稳定,可用于北斗B1频段和GPS L1频段.
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