Harmonic-Based Nonlinearity Factorization of Switching Behavior in Up-Conversion Mixers

A systematic approach is presented to analyze the switching pair linearity of low intermediate frequency (IF) up-conversion mixers. The approach explicitly divides the switching pair operation of the mixer into two steps-conversion of the low IF input to the common-source node voltage, in a common-m...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. I, Regular papers Regular papers, 2019-07, Vol.66 (7), p.2468-2477
Main Authors: Li, Jinbo, Gu, Qun Jane
Format: Article
Language:English
Subjects:
Analytical models
Capacitors
Electric potential
Harmonic analysis
harmonic trapping
Harmonics
Intermediate frequencies
Intermodulation
Linearity
Mixers
Nodes
Reactance
Routing
Switches
Switching
Switching circuits
time-varying systems
up-conversion mixers
Upconversion
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Summary:A systematic approach is presented to analyze the switching pair linearity of low intermediate frequency (IF) up-conversion mixers. The approach explicitly divides the switching pair operation of the mixer into two steps-conversion of the low IF input to the common-source node voltage, in a common-mode domain, and conversion of the common-source node voltage to the output, in a differential-mode domain. In this way, closed-form formulas of the signal gain and third-order intermodulation distortions (IMD 3 ) are derived, demonstrating that the even harmonics (mainly twice local oscillator frequency harmonics) on the common-source node affects the linearity performance significantly. As a result, the mixer linearity is strongly sensitive to the common-source node parasitic reactance. To suppress the even harmonics, we adopt a harmonic-trapping (HT) capacitor and demonstrate 9.1 dB improvement in OIP 3 from the fabricated chip prototypes. The analysis approach and HT technique are further validated by well-matched analytical predictions, simulation and measurement results.
ISSN:1549-8328
1558-0806
DOI:10.1109/TCSI.2019.2897584