在汽车防撞雷达接收系统中,为提高整个接收机的性能,当确定了低噪声放大器的性能指标后,在ADS软件的基础上,采用赝配高电子迁移率的晶体管VMMK-1225设计了工作频率为24 GHz的低噪声放大器。仿真结果表明,在24 GHz频率处,放大器的噪声系...在汽车防撞雷达接收系统中,为提高整个接收机的性能,当确定了低噪声放大器的性能指标后,在ADS软件的基础上,采用赝配高电子迁移率的晶体管VMMK-1225设计了工作频率为24 GHz的低噪声放大器。仿真结果表明,在24 GHz频率处,放大器的噪声系数<2 d B,增益>9 d B,稳定系数>1,输入与输出电压驻波比都<2。最后利用Cadence软件进行版图设计并给出了实测结果。该放大器可应用于雷达接收系统、汽车导航系统和防撞系统等领域。展开更多
In this paper a general weighted p-Laplacian equation involving critical growth and singular coefficients is considered on the unit ball, rather complete results are obtained for asymptotic behavio...In this paper a general weighted p-Laplacian equation involving critical growth and singular coefficients is considered on the unit ball, rather complete results are obtained for asymptotic behavior of positive solutions as λ→0+. This problem includes p- Laplacian, weighted Laplacian, and the Hessian operators which are special cases of our result.展开更多
文摘在汽车防撞雷达接收系统中,为提高整个接收机的性能,当确定了低噪声放大器的性能指标后,在ADS软件的基础上,采用赝配高电子迁移率的晶体管VMMK-1225设计了工作频率为24 GHz的低噪声放大器。仿真结果表明,在24 GHz频率处,放大器的噪声系数<2 d B,增益>9 d B,稳定系数>1,输入与输出电压驻波比都<2。最后利用Cadence软件进行版图设计并给出了实测结果。该放大器可应用于雷达接收系统、汽车导航系统和防撞系统等领域。
基金The research work was supported by the National Natural Science Foundation of China (No. 10071024)the Guangdong Provincial N
文摘In this paper a general weighted p-Laplacian equation involving critical growth and singular coefficients is considered on the unit ball, rather complete results are obtained for asymptotic behavior of positive solutions as λ→0+. This problem includes p- Laplacian, weighted Laplacian, and the Hessian operators which are special cases of our result.
