Event Details
A UHF Wideband GaAs MMIC LNA for Radio Telescopes
Presenter: Alireza Seyfollahi
Supervisor:
Date: Wed, February 9, 2022
Time: 10:00:00 - 11:00:00
Place: ZOOM - Please see below.
ABSTRACT
Link: https://uvic.zoom.us/j/87829400180?pwd=bDBJczVvUllQQVVtNTBYbHVwclordz09
Meeting ID: 878 2940 0180
ABSTRACT
Radio telescopes cover very wideband frequency ranges from several hundred megahertz to gigahertz and require amplifiers to provide a consistent low noise performance over the entire band. The simultaneous low noise, wideband, high gain specifications present a challenge in the LNA design as it is a key component for technology development of wideband receivers. The GaAs pseudomorphic high electron mobility transistor (pHEMT) has good low noise performance, and the MMIC technology is available at reasonable cost to produce high numbers of MMIC LNAs with consistent and reproducible amplifier performance. A wideband room temperature UHF-band MMIC low noise amplifier based on 0.15 μm pHEMT GaAs technology is presented. The amplifier achieves about 30 dB gain over a five-octave frequency range from 300 MHz to 1.5 GHz with minimum noise of 0.55 dB at room temperature. The two-stage amplifier utilizes an on-chip gain equalizer at the output and has a gain flatness of 3 dB over the 5:1 band in the fully packaged enclosure.