A flicker noise/IM3 cancellation technique for active mixer using negative impedance

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    Abstract—This paper presents an approach to simultaneously cancel flicker noise and IM3 in Gilbert-type mixers, utilizing negative impedances. For proof of concept, two prototype double-balanced mixers in 0.16- m CMOS are fabricated. The first demonstration mixer chip was optimized for full IM3 cancellation and partial flicker noise cancellation; this chip achieves 9-dB flicker noise suppression, improvements of 10 dB for IIP3, 5 dB for conversion gain, and 1 dB for input P1 dB while the thermal noise increased by 0.1 dB. The negative impedance increases the power consumption for the mixer by 16% and increases the die area by 8% (46 28 m ). A second demonstration mixer chip aims at full flicker noise cancellation and partial IM3 cancellation, while operating on a low supply voltage ( 0.67 x Vdd; in this chip,the negative impedance increases the power consumption by 7.3% and increases the die area by 7% (50 20 m ). For one chip sample, measurements show 10-dB flicker noise suppression within 200% variation of the negative impedance bias current; for ten randomly selected chip samples, 11-dB flicker noise suppression is measured.
    Original languageEnglish
    Pages (from-to)2390-2402
    Number of pages13
    JournalIEEE journal of solid-state circuits
    Issue number10
    Publication statusPublished - 1 Oct 2013



    • Narrowband
    • Noise cancellation
    • Flicker noise
    • EWI-23434
    • Distortion cancellation
    • Direct conversion
    • CMOS
    • Active mixer
    • IIP3
    • IM3
    • Linearity
    • METIS-297698
    • IR-87248
    • Receiver

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