Open AccessNoise analysis in distributed amplifiers with feedback‐active load
Author(s) -
Terán Jose Vicente,
Fuente Maria Luisa,
Limiti Ernesto,
Aja Beatriz,
Artal Eduardo
Publication year - 2016
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2016.0106
Subject(s) - active load , effective input noise temperature , amplifier , resistor , noise figure , y factor , electrical engineering , noise (video) , noise temperature , low noise amplifier , distributed amplifier , common gate , electronic engineering , transistor , engineering , computer science , operational amplifier , cmos , phase noise , voltage , artificial intelligence , image (mathematics)
This study presents the noise analysis of amplifiers when the input line termination is implemented via an active load. The noise figure (NF) of distributed amplifiers is analysed to determine the effect of the gate and drain terminations. The noise of a transistor configured as a one‐port device has been analysed and a lower noise temperature has been achieved as compared with a conventional resistor. In order to improve the noise performance of the overall amplifier, a parallel feedback has been added to the active load, and its effects are analysed in terms of noise. A distributed amplifier has been designed as a test vehicle of the analysis and characterised with a resistor as input line termination and with an active load to demonstrate the improvement in NF at frequencies below 2 GHz. The resulting amplifier exhibits 10.9 dB of small signal gain from 1 to 5 GHz, with a reduction of 0.6 dB in NF below 2 GHz when the input line termination is replaced by an active load.