NDLI: Cancellation of second-order intermodulation distortion and enhancement of IIP2 in common-source and common-emitter RF transconductors

Content Provider	IEEE Xplore Digital Library
Author	Sivonen, P. Vilander, A. Parssinen, A.
Copyright Year	2004
Abstract	In this paper, a biasing technique for cancelling second-order intermodulation (IM2) distortion and enhancing second-order intercept point (IIP2) in common-source and common-emitter RF transconductors is presented. The proposed circuit can be utilized as an RF input transconductor in double-balanced downconversion mixers. By applying the presented technique, the achievable IIP2 of the mixer is limited by the linearity of the switching devices, component mismatches, and offsets. The proposed circuit has properties similar to the conventional differential pair transconductor in that it ideally displays no IM2 distortion. However, the presented circuit is more suitable for operation at low supply voltages because it has only one device stacked between the transconductor input and output. In the conventional differential pair, two devices consume the voltage headroom. The noise performance of the proposed transconductor is similar to the noise performance of the traditional common-source (emitter) and differential pair transconductors at given bias and device dimensions. On the other hand, the third-order intercept point (IIP3) of the presented transconductor is slightly higher than the IIP3 of the differential pair transconductor at given bias. Finally, the proposed circuit can also be employed as a current mirror, the ratio of which is very insensitive to the voltage swings at the gate or base of the current mirrored transistor.
Sponsorship	IEEE Circuits and Systems Society
Starting Page	305
Ending Page	317
Page Count	13
File Size	500253
File Format	PDF
ISSN	15498328
Volume Number	52
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-02-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Intermodulation distortion Radio frequency Transconductors Low voltage Circuit noise Topology Linearity Displays Mirrors Baseband transconductor Biasing common emitter common source degeneration direct conversion downconversion mixer low voltage RF second-order intermodulation (IM2) second-order intercept point (IIP2) third-order intermodulation (IM3) third-order intercept point (IIP3)
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Hardware and Architecture

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