Investigation of LO-Coupled Noise for a Sideband Separation Superconducting SIS Receiver |
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| Affiliation: | 1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210033;2. Key Laboratory of Radio Astronomy, ChineseAcademy of Sciences, Nanjing 210033;1. National Time Service Center, Chinese Academy of Sciences, Xi’an 710600;2. Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Chinese Academy of Sciences, Xi’an 710600;3. School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049;4. University of Chinese Academy of Sciences, Beijing 100049;1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023;2. School of Physics and Optoelectronic Engineering, Nanjing University of Information Science and Technology, Nanjing 210044;3. School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026;1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210033;2. Key Laboratory of Planetary Sciences, Chinese Academy of Sciences, Nanjing 210033;3. School of Astronomy and Space Science, Nanjing University, Nanjing 210023;1. School of Physics and Electronic Information Technology, Yunnan Normal University, Kunming 650500;2. Key Laboratory of High Energy Astrophysics of University of Yunnan Province, Kunming 650500;1. Department of Astronomy, University of Science and Technology of China, Hefei 230026;2. Polar Research Institute of China, Shanghai 200136;3. Center for Astrophysics, Guangzhou University, Guangzhou 510006;4. Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216 |
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| Abstract: | The Superconducting Superconductor-Insulator-Superconductor (SIS) receivers have become the preferred method for (sub)millimeter-wave radio astronomical observations due to the extremely low receiver noise temperature. The coupling noise of the local oscillator (LO) system is also a part of the receiver noise. In many years of astronomical observations, it is found that the LO-coupled noise cannot be completely ignored, which has a certain impact on the sensitivity of astronomical observations. The noise temperature of the superconducting SIS receiver was tested using two different kinds of signal generators as the primary signal source of the LO system. It is found that the base noise output by the signal generator can be coupled into the receiver to increase the receiver noise. By adding a narrow band filter to the output of the signal generator, the base noise of the signal generator can be filtered out, and this part noise of the receiver can be eliminated, the overall noise of the receiver is reduced, and the sensitivity of the telescope is improved. |
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| Keywords: | Millimeter-wave radio astronomy multi-beam receiver receiver noise local oscillator (LO) |
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