A reconfigurable LNA with single switched input matching network for S-band (WiMAX/WLAN) applications. Issue 10 (October 2015)

• Record Type: Journal Article
• Authors: Eslahi, Hossein; Jalali, Ali; Nateghi, Saman; Mazloum, Jalil
• Is Part Of: Microelectronics journal. Volume 46:Issue 10(2015)
• Page Start: 956
• Page End: 962
• Publication Date: 2015-10
• Subjects: Microelectronics -- Periodicals; Microélectronique -- Périodiques; Microelectronics; Electronic journals; Journals - contents and abstracts; Periodicals; 621.3805
• DOI: 10.1016/j.mejo.2015.06.017
• Languages: English
• ISSNs: 0959-8324

Abstract

<abstract abstract-type="author" id="ab0005"> <title id="sect0005">Abstract</title> <sec> <p id="sp0080">In this paper a reconfigurable Low Noise Amplifier (LNA) which works at 2.4 GHz and 3.5 GHz frequency bands is presented. In discrete approach for designing reconfigurable circuits the switch is an undeniable part. But the number of switches can make many problems such as amount of noise factor. Here, a LNA has been introduced which has only one switch and is designed with discrete tuning technique that can show good performance at mentioned frequencies. Besides, the input matching network uses a circuit that presents relatively fixed real part in input impedance, and therefore, input matching is satisfied. Using current reuse technique causes the overall gain is set in high amount. LNA is designed using <inline-formula><alternatives><inline-graphic xlink:href="ark:/27927/pgj2p3q68wx" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="si0012.gif" overflow="scroll" id="d13e644" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mn>0.18</mml:mn><mml:mspace width=".25em" /><mml:mspace width=".25em" /><mml:mi mathvariant="normal">μ</mml:mi><mml:mi>m</mml:mi></mml:math></alternatives></inline-formula> CMOS technology and results of simulator express that its gain is <inline-formula><alternatives><inline-graphic xlink:href="ark:/27927/pgj2p3q6xcg" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="si0013.gif" overflow="scroll" id="d13e654" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mn>20.07</mml:mn><mml:mspace width=".25em" /><mml:mi mathvariant="normal">dB</mml:mi></mml:math></alternatives></inline-formula> and <inline-formula><alternatives><inline-graphic xlink:href="ark:/27927/pgj2p3q6x78" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="si0014.gif" overflow="scroll" id="d13e661" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mspace width=".25em" /><mml:mn>21.08</mml:mn><mml:mspace width=".25em" /><mml:mi mathvariant="normal">dB</mml:mi></mml:math></alternatives></inline-formula>, <inline-formula><alternatives><inline-graphic xlink:href="ark:/27927/pgj2p3q6mb8" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="si0007.gif" overflow="scroll" id="d13e670" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:mn>11</mml:mn></mml:mrow></mml:msub></mml:math></alternatives></inline-formula> is <inline-formula><alternatives><inline-graphic xlink:href="ark:/27927/pgj2p3q6qzr" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="si0015.gif" overflow="scroll" id="d13e679" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo>–</mml:mo><mml:mn>22.8</mml:mn><mml:mspace width=".25em" /><mml:mi mathvariant="normal">dB</mml:mi></mml:math></alternatives></inline-formula> and <inline-formula><alternatives><inline-graphic xlink:href="ark:/27927/pgj2p3pxxwf" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="si0016.gif" overflow="scroll" id="d13e688" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mspace width=".25em" /><mml:mo>–</mml:mo><mml:mn>28.86</mml:mn><mml:mspace width=".25em" /><mml:mi mathvariant="normal">dB</mml:mi></mml:math></alternatives></inline-formula>, <inline-formula><alternatives><inline-graphic xlink:href="ark:/27927/pgj2p3pxxc5" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="si0017.gif" overflow="scroll" id="d13e698" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:mn>22</mml:mn></mml:mrow></mml:msub></mml:math></alternatives></inline-formula> has <inline-formula><alternatives><inline-graphic xlink:href="ark:/27927/pgj2p3q6r0t" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="si0018.gif" overflow="scroll" id="d13e707" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo>−</mml:mo><mml:mn>18.16</mml:mn><mml:mspace width=".25em" /><mml:mi mathvariant="normal">dB</mml:mi></mml:math></alternatives></inline-formula> and <inline-formula><alternatives><inline-graphic xlink:href="ark:/27927/pgj2p3pxt59" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="si0019.gif" overflow="scroll" id="d13e716" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo>–</mml:mo><mml:mn>27.37</mml:mn><mml:mspace width=".25em" /><mml:mi mathvariant="normal">dB</mml:mi></mml:math></alternatives></inline-formula> values, NF is <inline-formula><alternatives><inline-graphic xlink:href="ark:/27927/pgj2p3q6m85" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="si0020.gif" overflow="scroll" id="d13e726" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mn>2.6</mml:mn><mml:mspace width=".25em" /><mml:mi mathvariant="normal">dB</mml:mi></mml:math></alternatives></inline-formula> and <inline-formula><alternatives><inline-graphic xlink:href="ark:/27927/pgj2p3q6ss1" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="si0021.gif" overflow="scroll" id="d13e733" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mn>3.1</mml:mn><mml:mspace width=".25em" /><mml:mi mathvariant="normal">dB</mml:mi></mml:math></alternatives></inline-formula>, and IP3 is equal to <inline-formula><alternatives><inline-graphic xlink:href="ark:/27927/pgj2p3q6p3f" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="si0022.gif" overflow="scroll" id="d13e740" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo>–</mml:mo><mml:mn>2</mml:mn><mml:mspace width=".25em" /><mml:mi mathvariant="normal">dB</mml:mi><mml:mspace width=".25em" /><mml:mspace width=".25em" /><mml:mi mathvariant="normal">m</mml:mi></mml:math></alternatives></inline-formula> and <inline-formula><alternatives><inline-graphic xlink:href="ark:/27927/pgj2p3pxwn2" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="si0023.gif" overflow="scroll" id="d13e753" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo>–</mml:mo><mml:mn>2.1</mml:mn><mml:mspace width=".25em" /><mml:mi mathvariant="normal">dB</mml:mi><mml:mspace width=".25em" /><mml:mspace width=".25em" /><mml:mi mathvariant="normal">m</mml:mi></mml:math></alternatives></inline-formula> in <inline-formula><alternatives><inline-graphic xlink:href="ark:/27927/pgj2p3q6hkk" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="si0024.gif" overflow="scroll" id="d13e766" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mn>2.4</mml:mn><mml:mspace width=".25em" /><mml:mi mathvariant="normal">GHz</mml:mi></mml:math></alternatives></inline-formula> and <inline-formula><alternatives><inline-graphic xlink:href="ark:/27927/pgj2p3q6zw8" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="si0025.gif" overflow="scroll" id="d13e773" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mn>3.5</mml:mn><mml:mspace width=".25em" /><mml:mi mathvariant="normal">GHz</mml:mi></mml:math></alternatives></inline-formula>, respectively. The proposed LNA consumes <inline-formula><alternatives><inline-graphic xlink:href="ark:/27927/pgj2p3q6jfw" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="si0026.gif" overflow="scroll" id="d13e781" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mn>11</mml:mn><mml:mspace width=".25em" /><mml:mspace width=".25em" /><mml:mi mathvariant="normal">mA</mml:mi></mml:math></alternatives></inline-formula> from a <inline-formula><alternatives><inline-graphic xlink:href="ark:/27927/pgj2p3q71v7" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="si0027.gif" overflow="scroll" id="d13e789" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mn>1.8</mml:mn><mml:mspace width=".25em" /><mml:mspace width=".25em" /><mml:mi mathvariant="normal">V</mml:mi></mml:math></alternatives></inline-formula> supply voltage.</p> </sec> </abstract>