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A Cryogenic L-band Low-noise Amplifier

Author: LiBin
Tutor: LiangShiGuang
School: Shanghai Astronomical Observatory
Course: Astronomical techniques and methods
Keywords: The refrigerant low noise amplifier pHEMT Kelvin ADS
CLC: TN722
Type: Master's thesis
Year: 2004
Downloads: 250
Quote: 1
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Abstract


This article describes the development process of the L-band refrigeration low noise amplifier . The amplifier will be used in the L-band Netherlands NFRA (Netherlands Foundation for Research in Astronomy) Institute for the Shanghai Observatory manufacturing refrigeration receiver . Classic Microwave Theory and Modern microwave design auxiliary ADS (Advanced Design System) software in the design process , combined , the modular design of the amplifier , and take full account of the requirements of the various indicators of the low-noise amplifier and its cryogenic applications . Also discussed noise measurement method of low-temperature and low-temperature noise test system . Was completed in May 2004 , in the Institute of NFRA first L-band refrigeration low noise amplifier , and carried out at room temperature and low temperature testing . The amplifier using Agilent ATF-35143 pseudomorphic high electron mobility field effect transistor (pHEMT), the the two cascade structure , frequency range of 1600MHz to 1740MHz . In the physical temperature of less than 15K (Kelvin) of the environment , the amplifier operates normally , the DC bias point in 2V 7mA gain greater than 28dB , the band fluctuation is less than 0.2dB , the noise is less than 4 K , good input matching at - 22dB, output matching better than -16dB, unconditionally stable . The low - temperature measurements to meet the requirements of the L-band refrigerant receiver , has reached the advanced level of similar devices in the field of foreign radio astronomy . At room temperature and the environment , the DC bias point of the amplifier are 2V 10mA gain greater than 27dB, with fluctuation is less than 0.2dB noise is less than 35K , the input and output matching better than - 18dB 1dB compression point Power greater than 9dBm , unconditional stable. Ambient temperature measurement results show that the amplifier can be used as a first stage L band refrigerant receiver room temperature amplifier . Two applications of a design in the room temperature environment and low temperature environments .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Amplification technology,the amplifier > Amplifier
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