NDLI: Reconfigurable SiGe Low-Noise Amplifiers With Variable Miller Capacitance

Content Provider	IEEE Xplore Digital Library
Author	Yu-Che Yang Po-Wei Lee Hung-Wei Chiu Yo-Sheng Lin Guo-Wei Huang Shey-Shi Lu
Copyright Year	2004
Abstract	A new input matching method making use of shunt-shunt feedback capacitance is introduced. Based on the new input matching method, reconfigurable SiGe low-noise amplifiers (LNAs) by varying shunt-shunt feedback capacitance are proposed. Two approaches are used to vary the shunt-shunt feedback capacitance. One approach is to switch between two different bias currents while the other is to use a series combination of a switch and a capacitor. Miniaturized fully monolithic reconfigurable SiGe LNAs without emitter degenerative inductors were realized by the above two approaches. The reconfigurable SiGe LNA achieved by switching bias currents only occupies a very small area of 355 mumtimes155 mum, excluding measurement pads. This LNA achieves an input return losses (S₁₁) of -27.6 dB, a voltage gain (A _v) of 19.8 dB, and a noise figure (NF) of 3.18 dB for 2.4-GHz band when biased at a current of 3.8 mA and can be reconfigured to obtain A_v=20.4/20.3 dB, S₁₁=-47.1/-24.6 dB and NF=3.42/3.21 dB for 5.2/5.7-GHz band when bias current is switched to 3 mA. In addition, a 2.4/4.9/5.2/5.7-GHz reconfigurable SiGe LNAs for WLAN applications, whose variable shunt-shunt feedback capacitance is controlled by a switch and a capacitor, was also realized
Sponsorship	IEEE Circuits and Systems Society
Starting Page	2567
Ending Page	2577
Page Count	11
File Size	1474473
File Format	PDF
ISSN	15498328
Volume Number	53
Issue Number	12
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Silicon germanium Germanium silicon alloys Low-noise amplifiers Capacitance Switches Feedback Impedance matching Capacitors Inductors Area measurement SiGe BiCMOS CMOS low-noise amplifier (LNA) multiband reconfigurable
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Hardware and Architecture

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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