NDLI: Using the Gate–Bulk Interaction and a Fundamental Current Injection to Attenuate IM3 and IM2 Currents in RF Transconductors

Content Provider	IEEE Xplore Digital Library
Author	Asghari, M. Yavari, M.
Copyright Year	1993
Abstract	Two new linearization techniques to attenuate the second-order intermodulation (IM2) and third-order intermodulation (IM3) currents in transconductance stage of CMOS active mixers are proposed. In the first technique, the third-order Volterra kernel of the transconductance stage output current is cancelled using the interaction between the gate and bulk terminals of the input transistors. For this end, a IM2 voltage, with an adjustable magnitude and phase, is produced and applied to the bulk of these transistors. This produces an interaction term in the IM3 current of the stage and attenuates the total IM3 current. In the second technique, a fundamental component is added to the current of the tail source in the transconductance stage. This component produces an IM2 term in the drain current of the input transistors, caused by g'm of the input transistors, with an equal magnitude and opposite phase related to the intrinsic IM2 current of the stage, and cancels the total IM2 current. Spectre-RF simulation results show that the proposed techniques simultaneously improve the third-order input intercept point and second-order input intercept point by ~14.1 and 16.4 dB, respectively, compared with the conventional active mixer, while 1.66-mA extra current is drawn from a single 1.2 V power supply.
Sponsorship	IEEE Computer Society Association for Computing Machinery (ACM)/SIGDA IEEE Computer Society Technical Committee on Design Automation
Starting Page	223
Ending Page	232
Page Count	10
File Size	2137660
File Format	PDF
ISSN	10638210
Volume Number	24
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2016-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Transistors Transconductance Mixers Kernel Logic gates Linearity Resistors third-order intermodulation (IM3). CMOS active mixers gate-bulk interaction Gilbert-cell second-order input intercept point (IIP2) third-order input intercept point (IIP3) linearity second-order intermodulation (IM2) third-order intermodulation (IM3) gate–bulk interaction linearity, second-order intermodulation (IM2)
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Software Hardware and Architecture

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