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High linearity, low noise, L‐band cryogenic amplifier for radio astronomical receivers
Author(s) -
Liu Hongfei,
Jin Chengjin,
Cao Yang,
Gan Hengqian
Publication year - 2017
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.30334
Subject(s) - amplifier , low noise amplifier , flatness (cosmology) , noise figure , linearity , microwave , noise temperature , physics , electrical engineering , return loss , radio frequency , engineering , optoelectronics , materials science , telecommunications , cmos , cosmology , quantum mechanics , antenna (radio)
This letter presents a novel L‐band cryogenically‐ coolable low noise amplifier applied in radio astronomical receivers. This amplifier can be operated at temperatures of 300K to 4K. Its noise temperature is less than 6K at 20K physics temperature in the frequencies of 1.2∼1.8 GHz. Over 30 dB gain, more than 10 dB input / output return loss and better than ±0.75 dB gain flatness are achieved; Especially, this LNA achieves extremely high large signal performance. Its three order intercepts and 1 dB compressed power referred to output is up to 25.5 dBm and 15 dBm, respectively. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:500–505, 2017