A Very Low-Noise, Fixed-Tuned Mixer for 240-270 GHz

Details A Very Low-Noise, Fixed-Tuned Mixer for 240-270 GHz A Very Low-Noise, Fixed-Tuned Mixer for 240-270 GHz

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985imsd.conf..311f&link_type=abstract

IEEE MTT-S International Microwave Symposium Digest. Volume 85, Issue 1, p. 311-314

Physics

Scientific paper

A cryogenic, single-ended, fundamental frequency mixer is reported. The use of a small-area Schottky barrier diode (Co = 4 fF) having low series resistance, together with a careful design and optimization, have yielded a very low-noise, broadband mixer which, when fixed-tuned and cooled to 20K, has a single-sideband noise temperature less than 400K for a local oscillator frequency between 242 and 272 GHz. At 266 GHz the mixer has only 6.4 dB of conversion loss and its SSB noise temperature is only 275K. This is the lowest noise temperature ever reported for a Schottky diode mixer in this frequency range.

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