A distributed lumped-element SIS mixer with very wide instantaneous bandwidth
A distributed lumped-element SIS mixer with very wide instantaneous bandwidth
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DOI：
10.1109/tasc.2005.849885
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发表时间：
2005-06
影响因子：
1.8
通讯作者：
C. Tong;R. Blundell;K. Megerian;J. A. Stern;Shing-Kuo Pan;M. Pospieszalski
中科院分区：
文献类型：
--
作者：
C. Tong;R. Blundell;K. Megerian;J. A. Stern;Shing-Kuo Pan;M. Pospieszalski
为330~420 GHz波导型混合器设计了一种新型的低输出电容分布式超导混合器。在本设计中，一对集总元件超导体-绝缘体-超导体结串联在一起，形成复合传输线的单元单元。该混合器使用两个级联单元。使用5 GHz的中频，我们测量了360-410 GHz范围内90-120K的双边带(DSB)接收机噪声温度。这种混音器设计提供了非常宽的瞬时带宽。测量到的中频带宽超过18 GHz。在384 GHz的本机振荡器频率下，在18 GHz的中频下测得的Y因子为2.1，而在5 GHz的中频下测得的Y因子为2.2。该混音器还具有高动态范围。只有当输入黑体载荷为30000 K时，才能达到1分贝的输入压缩点。
A novel type of distributed superconducting mixer with very low output capacitance has been designed for a 330-420 GHz waveguide mixer. In this design, a pair of lumped element Superconductor-Insulator-Superconductor junctions is connected in series to form the unit cell of a composite transmission line. The mixer utilizes two cascaded cells. Using an intermediate frequency (IF) of 5 GHz, we have measured Double-side-band (DSB) receiver noise temperatures of 90-120 K between 360 and 410 GHz. This mixer design offers very wide instantaneous bandwidth. The measured IF bandwidth is in excess of 18 GHz. At a Local Oscillator frequency of 384 GHz, the Y-factor measured at an IF frequency of 18 GHz is 2.1, compared to a Y-factor of 2.2 measured at an IF of 5 GHz. The mixer also has a high dynamic range. The 1-dB input compression point is only reached with an input black body load of 30,000 K.