使用MMIC LNA的低温集成噪声校准和耦合器模块
A Cryogenic Integrated Noise Calibration and Coupler Module Using a MMIC LNA
摘要：
介绍了一种用于射电天文接收机的低温噪声校准源。功耗仅为4.2 mW，可与接收器的冷端部分集成。测量的长期稳定性，偏置电压的灵敏度，和噪声功率输出与频率。将测得的噪声输出与频率的关系与注入低温K波段接收机的热噪声二极管进行比较，并显示集成噪声模块具有更少的频率结构，这将导致更精确的天文通量校准。它目前正在NRAO的新的7单元K波段焦平面阵列接收器上运行。伯德格林班克望远镜（GBT）
英文摘要：
A new cryogenic noise calibration source for radio astronomy receivers is presented. Dissipated power is only 4.2 mW, allowing it to be integrated with the cold part of the receiver. Measured long-term stability, sensitivity to bias voltages, and noise power output versus frequency are presented. The measured noise output versus frequency is compared to a warm noise diode injected into cryogenic K-band receiver and shows the integrated noise module to have less frequency structure, which will result in more accurate astronomical flux calibrations. It is currently in operation on the new 7-element K-band focal plane array receiver on the NRAO Robert C. Byrd Green Bank Telescope (GBT).
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