Front-End Sub-System for the 12 m-Antenna Array Technical Specifications
Front-End Sub-System for the 12 m-Antenna Array Technical Specifications
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12 m 天线阵列前端子系统技术规格
DOI：
10.1109/lmwc.2018.2813886
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发表时间：
2007
影响因子：
3
通讯作者：
M. Tarenghi
中科院分区：
文献类型：
--
作者：
C. Cunningham;G. Tan;H. Rudolf;K. Saini;J. Webber;C. Haupt;R. Murowinski;M. Tarenghi
设计了一个用于射电天文的E波段低频带混频器，并考虑了功率压缩问题。分析了E波段天文接收机混频器的功率线性度指标。推导了功率压缩引起的噪声温度误差理论。分析表明，具有非常低的噪声温度的接收机对功率饱和更加敏感。在此基础上，将混频器的功率压缩设置为小于2%（0.088 dB），因此混频器的IP 1dB至少要比输入功率高11 dB，才能满足30-60 K噪声温度的接收机要求。在改进型共源共栅混频器的设计中，对晶体管尺寸进行了探索，以提供足够的IP 1dBand转换增益。所设计的宽带混频器的IP 1dB高于3dBm。该性能适合于E波段天文外差接收机的应用。
A lower sideband E-band mixer for radio astronomy is designed with consideration of the power compression. An E-band receiver for astronomy is analyzed to derive the power linearity specification of the mixer. The theory of noise-temperature error due to the power compression is derived. The analysis reveal that receiver with very low noise temperature is much more sensitive to the power saturation. Based on the analysis, the power compression of the mixer is set to less than 2% (0.088 dB), thus the mixer IP1dBshould be at least 11 dB higher than the input power to meet the requirement of the receiver with 30-60-K noise temperature. The transistor sizes were explored in the design of the modified cascode mixer to provide sufficient IP1dBand conversion gain. The designed broadband mixer is with IP1dBhigher than 3 dBm. This performance is suitable for the E-band astronomical heterodyne receiver applications.