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Published October 2006 | public
Journal Article

345 GHz Prototype SIS Mixer with Integrated MMIC LNA


We report on heterodyne measurements at submillimeter wavelengths using a receiver with a Superconductor-Insulator-Superconductor (SIS) mixer device and a Microwave Monolithic Integrated Circuit (MMIC) cryogenic low noise amplifier (LNA) module integrated into the same block. The mixer characterization presented in this work demonstrates the feasibility of operating a MMIC LNA in close proximity to the SIS device without penalty in mixer performance due to heating effects. Verification of this functionality is crucial for the ongoing development of SuperCam, a 64-pixel focal plane array receiver consisting of eight, 1 × 8 integrated mixer/LNA modules. The test setup included a mixer block modified to accept a MMIC amplifier. Our tests show that the LNA can be operated over a broad range of V_(drain) voltages from 0.40–1.40 V, corresponding to dissipative powers of 2.6–29 mW. We observe no significant effect on the measured uncorrected receiver noise temperatures in the 345 GHz band.

Additional Information

© 2007 Springer Science+Business Media, LLC. Received 16 June 2006. First Online: 08 May 2007. This project has been financed through the SuperCam project, NSF grant no. 0421499. P. Pütz is partially supported by the Deutsche Forschungsgemeinschaft (DFG), grant no. SFB494. A. Hedden is supported by NASA GSRP, grant no. NGT5-50463.

Additional details

August 22, 2023
October 18, 2023