Noise analysis in distributed amplifiers with feedback-active load

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URI: http://hdl.handle.net/10902/11125
ISSN: 1751-8725
ISSN: 1751-8733
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Autoría
Terán Collantes, José VicenteAutoridad Unican; Fuente Rodríguez, Luisa María de laAutoridad Unican; Limiti, Ernesto; Aja Abelán, BeatrizAutoridad Unican; Artal Latorre, EduardoAutoridad Unican
Fecha
2016-12-10
Derechos
© Institution of Engineering and Technology. This paper is a postprint of a paper submitted to and accepted for publication in IET Microwaves, Antennas and Propagation and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at the IET Digital Library.
Publicado en
IET Microwaves, Antennas and Propagation, 2016, 10(15), 1692-1700
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Institution of Engineering and Technology (IET)
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Resumen/Abstract
This paper 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.
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