<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2013000200007</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Microwave noise sources contributions to SiGe: C/Si and InP/InGaAs HBT's performances]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pacheco-Sánchez]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-García]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Méndez]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Galaz-Larios]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Márquez-Beltrán]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Enciso-Aguilar]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Politécnico Nacional. Escuela Superior de Ingeniería Mecánica y Eléctrica. ]]></institution>
<addr-line><![CDATA[ D.F]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Benemérita Universidad Autónoma de Puebla. Instituto de Física. ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2013</year>
</pub-date>
<volume>59</volume>
<numero>2</numero>
<fpage>148</fpage>
<lpage>152</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2013000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2013000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2013000200007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[The present work describes the quantification of the noise sources contributions to the microwave transistor noise performance, particularly focusing on the minimum noise factor (Fmin) and on the equivalent noise resistance (Rn). For this analysis microwave noise small-signal modeling is used. This study is performed for one SiGe:C/Si and one InP/InGaAs heterojunction bipolar transistor (HBT) at several bias points and at two operation frequencies. It is shown that some parameters usually neglected to develop simplified formulas for noise analysis have a non-negligible contribution to Fmin and Rn. This demonstrates that for other HBT technologies it is necessary to carry out a similar study in order to determine whether noise sources can be neglected or not. This procedure may be useful when deriving simplified and accurate models of microwave noise analysis. The development of accurate and simplified analytical models for noise analysis for many other HBT (III-V and IV-IV) technologies may benefit from this procedure.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[En este trabajo se describe la cuantificación de las diferentes fuentes de ruido que contribuyen al funcionamiento en ruido del transistor, orientándose particularmente sobre el factor de ruido mínimo (Fmin) y la resistencia de ruido equivalente (Rn), para ello nos basamos en el modelado en pequeña señal de altas frecuencias con ayuda del circuito eléctrico equivalente. El análisis es llevado a cabo para dos transistores bipolares de heterounión (TBH), uno SiGe:C y otro InP/InGaAs. Este estudio es realizado bajo diferentes niveles de polarización y para dos frecuencias de operación. Los resultados muestran que algunos parámetros usualmente despreciados para el análisis de ruido de microondas tienen una contribución no despreciable sobre Fmin y Rn. Esto es un indicador de que es necesario realizar un estudio similar al descrito en este artículo para determinar si una fuente de ruido puede ser despreciada o no. Este procedimiento puede ser aplicado para el desarrollo de modelos de análisis de ruido microondas simplificados y precisos que podrían ser útiles para una gran gama de TBH (III-V and IV-IV).]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Emitter resistance]]></kwd>
<kwd lng="en"><![CDATA[heterojunction bipolar transistor]]></kwd>
<kwd lng="en"><![CDATA[microwave noise]]></kwd>
<kwd lng="en"><![CDATA[small-signal noise modeling]]></kwd>
<kwd lng="es"><![CDATA[Modelado eléctrico de ruido]]></kwd>
<kwd lng="es"><![CDATA[resistencia de emisor]]></kwd>
<kwd lng="es"><![CDATA[ruido de microondas]]></kwd>
<kwd lng="es"><![CDATA[transistor bipolar de heterounión]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>Microwave noise sources contributions to SiGe:C/Si and InP/InGaAs HBT's performances</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>A. Pacheco&#45;S&aacute;nchez<sup>a</sup>, E. Ram&iacute;rez&#45;Garc&iacute;a<sup>a</sup>, L. Rodr&iacute;guez&#45;M&eacute;ndez<sup>a</sup>, M.Galaz&#45;Larios<sup>a</sup>, C. M&aacute;rquez&#45;Beltr&aacute;n<sup>b</sup>, and M. Enciso&#45;Aguilar<sup>a</sup></b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>a</sup> Instituto Polit&eacute;cnico Nacional, Escuela Superior de Ingenier&iacute;a Mec&aacute;nica y El&eacute;ctrica, Unidad Profesional "Adolfo L&oacute;pez Mateo". Edif. Z&#45;4 3er. Piso 07738, D.F M&eacute;xico, Secci&oacute;n de Estudios de Posgrado e Investigaci&oacute;n, Maestr&iacute;a en Ciencias en Ingenier&iacute;a de Telecomunicaciones,</i> <i>e&#45;mail:</i> <a href="mailto:mencisoa@ipn.mx">mencisoa@ipn.mx</a><i>;</i> <a href="mailto:anibalverbeno@gmail.com">anibalverbeno@gmail.com</a></font></p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>b</sup> Instituto de F&iacute;sica, Benem&eacute;rita Universidad Aut&oacute;noma de Puebla, Apartado Postal J&#45;48, Puebla 72570, M&eacute;xico.</i></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Recibido el 8 de mayo de 2012.    <br> 	Aceptado el 12 de noviembre de 2012.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">The present work describes the quantification of the noise sources contributions to the microwave transistor noise performance, particularly focusing on the minimum noise factor (F<sub>min</sub>) and on the equivalent noise resistance (R<sub><i>n</i></sub>). For this analysis microwave noise small&#45;signal modeling is used. This study is performed for one SiGe:C/Si and one InP/InGaAs heterojunction bipolar transistor (HBT) at several bias points and at two operation frequencies. It is shown that some parameters usually neglected to develop simplified formulas for noise analysis have a non&#45;negligible contribution to <i>F<sub>min</sub></i> and R<sub>n</sub>. This demonstrates that for other HBT technologies it is necessary to carry out a similar study in order to determine whether noise sources can be neglected or not. This procedure may be useful when deriving simplified and accurate models of microwave noise analysis. The development of accurate and simplified analytical models for noise analysis for many other HBT (III&#45;V and IV&#45;IV) technologies may benefit from this procedure.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Emitter resistance; heterojunction bipolar transistor; microwave noise; small&#45;signal noise modeling.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">En este trabajo se describe la cuantificaci&oacute;n de las diferentes fuentes de ruido que contribuyen al funcionamiento en ruido del transistor, orient&aacute;ndose particularmente sobre el factor de ruido m&iacute;nimo (F<sub>min</sub>) y la resistencia de ruido equivalente (R<sub>n</sub>), para ello nos basamos en el modelado en peque&ntilde;a se&ntilde;al de altas frecuencias con ayuda del circuito el&eacute;ctrico equivalente. El an&aacute;lisis es llevado a cabo para dos transistores bipolares de heterouni&oacute;n (TBH), uno SiGe:C y otro InP/InGaAs. Este estudio es realizado bajo diferentes niveles de polarizaci&oacute;n y para dos frecuencias de operaci&oacute;n. Los resultados muestran que algunos par&aacute;metros usualmente despreciados para el an&aacute;lisis de ruido de microondas tienen una contribuci&oacute;n no despreciable sobre F<sub><i>min</i></sub> y R<sub><i>n</i></sub>. Esto es un indicador de que es necesario realizar un estudio similar al descrito en este art&iacute;culo para determinar si una fuente de ruido puede ser despreciada o no. Este procedimiento puede ser aplicado para el desarrollo de modelos de an&aacute;lisis de ruido microondas simplificados y precisos que podr&iacute;an ser &uacute;tiles para una gran gama de TBH (III&#45;V and IV&#45;IV).</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> Modelado el&eacute;ctrico de ruido; resistencia de emisor; ruido de microondas; transistor bipolar de heterouni&oacute;n.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">PACS: 07.50.Hp; 85.30.De; 85.30.Pq; 85.40.Qx</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v59n2/v59n2a7.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORAMTO PDF</a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Acknowledgements</b></font></p>  	    <p align="justify"><font face="verdana" size="2">We thank the Mexican National Council of Science and Technology (CONACyT&#45;M&eacute;xico) for the financial support under the contract no. 106698 and COFAA&#45;IPN.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1 . 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