High Doping Density Schottky Diodes in the 3MM Wavelength Cryogenic Heterodyne Receiver |
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Authors: | V I Piddyachiy V M Shulga A M Korolev and V V Myshenko |
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Institution: | (1) Institute of Radio Astronomy, Ukrainian Academy of Sciences, 4, Chervonopraporna, St., Kharkiv, 61002, Ukraine |
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Abstract: | The paper describes a 3mm cryogenic mixer receiver using high doping density (“room-temperature”) Schottky diodes. The measured equivalent noise temperature Teq of the diodes is 109 K at 20 K, which is much higher than the Teq of the low doping density (“cryogenic”) diodes. In spite of this, the double-sideband (DSB) noise temperature of the cryogenic receiver developed is 55 K at 110 GHz, owing to the low conversion loss of the mixer and ultra-low noise of the PHEMT IF amplifier. This is the lowest noise temperature ever reported for a Schottky diode mixer receiver. The results obtained are useful for the development of submm receivers in which high doping density Schottky diodes are used. |
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Keywords: | “ Room-temperature” Schottky diodes mixer receiver PHEMT IF amplifier |
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