NDLI: A high isolation CMFB downconversion micromixer using 0.18-/spl mu/m deep n-well CMOS technology

Content Provider	IEEE Xplore Digital Library
Author	Meng, C.C. Xu, S.K. Wu, T.H. Chao, M.H. Huang, G.W.
Copyright Year	2003
Description	Author affiliation: Dept. of Commun. Eng., Nat. Chiao-Tung Univ., Hsin-Chu, Taiwan (Meng, C.C.)
Abstract	CMOS deep n-well technology can eliminate body effects of NMOS transistors and improve LO-IF and LO-RF isolation in a Gilbert micromixer. A 37 dB LO-IF and 38 dB LO-RF isolation downconversion micromixer with 19 dB conversion gain, IP/sub 1dB/=-19.5 dBm and IIP/sub 3/=-12.5 dBm when RF=2.4 GHz and LO=2.25 GHz is demonstrated in this paper by using 0.18 /spl mu/m deep n-well CMOS technology. The input return loss and output return loss are better than 15 dB for frequencies up to 6 GHz. On the other hand, a downconversion micromixer without deep n-well has almost identical power performance but achieves only 20 dB LO-IF isolation and 21 dB LO-RF isolation even if two kinds of mixers are fabricated in adjacent areas of the same wafer. The downconversion micromixer used here has an intrinsically single-to-differential input stage and active differential PMOS loads to increase IF differential gain while CMFB is used to stabilize bias points. An IF differential amplifier converts differential output into a single-ended output. Finally, an off-chip rat-race coupler provides balanced LO signals to facilitate isolation measurement.
Sponsorship	IEEE Microwave Theory & Tech. Soc. IEEE Electron. Device Soc. IEEE Solid States Circuits Soc
Starting Page	619
Ending Page	622
File Size	223410
Page Count	4
File Format	PDF
ISBN	0780376943
ISSN	15292517
DOI	10.1109/RFIC.2003.1214023
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-06-09
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	CMOS technology Isolation technology Transconductance MOSFETs Gain Frequency Mixers Degradation Chaotic communication Laboratories
Content Type	Text
Resource Type	Article

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