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Harmonic-Based Nonlinearity Factorization of Switching Behavior in Up-Conversion Mixers.
- Source :
-
IEEE Transactions on Circuits & Systems. Part I: Regular Papers . Jul2019, Vol. 66 Issue 7, p2468-2477. 10p. - Publication Year :
- 2019
-
Abstract
- 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 (IMD3) 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 OIP3 from the fabricated chip prototypes. The analysis approach and HT technique are further validated by well-matched analytical predictions, simulation and measurement results. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 15498328
- Volume :
- 66
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Circuits & Systems. Part I: Regular Papers
- Publication Type :
- Periodical
- Accession number :
- 137116471
- Full Text :
- https://doi.org/10.1109/TCSI.2019.2897584