NDLI: The linearity improvement of LNA for W-CDMA

Content Provider	IEEE Xplore Digital Library
Author	Cho, M.G. Park, S.K. Chang, H.L. Park, C.B.
Copyright Year	2002
Abstract	While an LNA (low noise amplifier) has several requirements (high gain, low noise figure, low in out VSWR, and high stability), it is difficult to satisfy the desired specifications all together. Moreover, W-CDMA (wideband code division multiple access) receiving systems require high linearity to have good sensitivity, and the portable communication devices have low power consumption. It is important to select an appropriate transistor and have some trade offs among the required specifications to satisfy and optimize various specifications. We designed and fabricated an LNA which can be used in a W-CDTWA receiving system. For improving the input VSWR and stability an inductance composing of series feedback was added to the emitter, and for acquiring high-linearity at low DC bias current the by-passing method was used. The fabricated LNA had a power gain of 15.33 dB, NF 2.17 dB, S/sub 11/ 9.53 dB, S/sub 22/ 35.91 dB at 2.16 GHz, and IIP/sub 3/ +5.34 dBm with 10 MHz channel spacing. We think that this LNA can be applied to a W-CDMA receiving system.
Sponsorship	IEEE Region 10 IEEE Comput. Soc. Beijing Chapter IEEE Commun. Soc. Beijing Chapter IEEE Control Syst. Soc. Beijing Chapter IEEE Power Eng. Soc. Beijing Chapter IEEE Power Electron. Soc. Beijing Chapter IEEE Signal Process. Soc. Biejing Chapter
Starting Page	1113
Ending Page	1116
File Size	249744
Page Count	4
File Format	PDF
ISBN	0780374908
DOI	10.1109/TENCON.2002.1180319
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-10-28
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Linearity Multiaccess communication Noise figure Stability Broadband amplifiers Low-noise amplifiers Wideband Energy consumption Inductance Feedback
Content Type	Text
Resource Type	Article

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