A SiGe HBT low noise variable gain amplifier with controllable feedback of a p-i-n diode - 文章详情页

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A　low　noise　amplifier　with　dB-linear　variable　gain　has　been　designed　and　fabricated　based　on　high　performance　SiGe　HBT　in　this　paper.　Negative　feedback　technology　has　been　adopted　to　change　the　transmission　gain　of　HBT　through　variable　resistance　of　a　forward　biased　p-i-n　diode　in　the　feedback　path.　The　simulation　results　and　measurement　results　agree　well　in　frequency　of　1.8GHz　for　CDMA　application.　A　dynamic　gain　control　of　14　dB　in　a　control　voltage　range　of　0.6-3.0　V　has　been　achieved　through　the　controllable　feedback　of　the　p-i-n　diode.　The　noise　figure　was　always　lower　than　5.5dB　when　the　controlled　voltage　changed　and　the　minimum　noise　figure　is　about　2.6dB.　Both　input　matching　and　output　matching　maintained　constants　under　all　controlled　voltage　points.　©　2011　CJMW.

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[ 1 ] [Xie, H.Y.]Colledge of Electronic Information and Control Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing, 100124, China
[ 2 ] [Lu, Z.Y.]Colledge of Electronic Information and Control Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing, 100124, China
[ 3 ] [Gan, J.N.]Colledge of Electronic Information and Control Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing, 100124, China
[ 4 ] [Jin, D.Y.]Colledge of Electronic Information and Control Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing, 100124, China
[ 5 ] [Zhang, W.R.]Colledge of Electronic Information and Control Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing, 100124, China
[ 6 ] [Ding, C.B.]Colledge of Electronic Information and Control Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing, 100124, China
[ 7 ] [Liu, B.Y.]Colledge of Electronic Information and Control Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing, 100124, China
[ 8 ] [Zhang, D.H.]Colledge of Electronic Information and Control Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing, 100124, China

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