摘要
设计与实现了一种应用于X波段(10.5～12 GHz)汽车雷达测速仪的低噪声放大器(LNA),该放大器选用NEC公司的GaAs FET(NE3503M04)低噪声放大管。直流偏置电路采用单电源供电、源极自偏置结构,并采用具有低阻抗特性的扇形微带短截线代替源极的旁路电容;在放大器的输出端串接一个9.1Ω的电阻,用来改善低噪声放大器的稳定性;利用微波电路仿真软件ADS进行电路的初步设计、仿真和优化。最后研制出了一种结构紧凑的低噪声放大器,经测试表明:在10～12 GHz频率范围内,功率增益大于10 dB,增益平坦度小于2 dB,噪声系数小于1.8 dB,输入输出驻波比(VSWR)小于2,满足了该汽车雷达测速仪中低噪声放大器的设计要求。
A low noise amplifier for the X-band car radar speedometer applications was designed and fabricated.The NEC＇s GaAs FET（NE3503M04） was used in the amplifier circuit.In DC bias circuit,the single power supply and the source electrode self-biased structure were used,and the radial microstrip stub with low impedance characteristics was used instead of bypass capacitor on source electrode.In the circuit,a 9.1 Ω resistance at the output terminal was cascaded to improve the stability of the amplifier.The microwave software ADS was applied to design,simulate and optimize the circuit.The measured results show that the LNA can provide more than 10 dB power gain and less than 1.8 dB noise figure at the frequencies of 10-12 GHz.The flatness of the gain is less than 2 dB,and the input/output VSWRs are less than 2.It meets the design requirements of LNA of X-band car radar speedometer.
出处
《半导体技术》
CAS
CSCD
北大核心
2012年第11期874-877,共4页
Semiconductor Technology
基金
国家自然科学基金资助项目(60971052)
