Low-noise room-temperature and cryogenic mixers for 80-120 GHz

Details Low-noise room-temperature and cryogenic mixers for 80-120 GHz Low-noise room-temperature and cryogenic mixers for 80-120 GHz

Oct 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975itmtt..23..781k&link_type=abstract

IEEE Transactions on Microwave Theory and Techniques, vol. MTT-23, Oct. 1975, p. 781-787. NSF-supported research.

Physics

14

Cryogenics, Low Noise, Microwave Circuits, Mixing Circuits, Network Synthesis, Room Temperature, Capacitance, Cooling Systems, Noise Temperature, Radio Telescopes, Schottky Diodes, Signal Mixing, Single Sideband Transmission, Temperature Effects, Waveguides

Scientific paper

A description is given of two new mixers designed to operate in the 80-120-GHz range on 36-ft radio telescope. It is shown that for a hard-driven diode the parasitic resistance and capacitance are the primary factors influencing the design of the diode mount. A room-temperature mixer is described which achieves a single-sideband (SSB) conversion loss (L) of 5.5 dB, and a SSB noise temperature (Tm) of 500 K (excluding the IF contribution) with a 1.4-GHz IF. A cryogenically cooled version, using a quartz structure to support the diode chip and contact whisker, achieves values of L = 5.8 dB and Tm = 300 K with a 4.75-GHz IF. The mixers use high-quality Schottky-barrier diodes in a one-quarter-height waveguide mount.

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