The BLIXER, a Wideband Balun-LNA-I/Q-Mixer Topology

S.C. Blaakmeer, Eric A.M. Klumperink, Domine M.W. Leenaerts, Bram Nauta

    Research output: Contribution to journalArticleAcademicpeer-review

    118 Citations (Scopus)
    263 Downloads (Pure)


    Abstract—This paper proposes to merge an I/Q current-commutating mixer with a noise-canceling balun-LNA. To realize a high bandwidth, the real part of the impedance of all RF nodes is kept low, and the voltage gain is not created at RF but in baseband where capacitive loading is no problem. Thus a high RF bandwidth is achieved without using inductors for bandwidth extension. By using an I/Q mixer with 25% duty-cycle LO waveform the output IF currents have also 25% duty-cycle, causing 2 times smaller DC-voltage drop after IF filtering. This allows for a 2 times increase in the impedance level of the IF filter, rendering more voltage gain for the same supply headroom. The implemented balun-LNA-I/Q-mixer topology achieves 18 dB conversion gain, a flat noise figure 5.5 dB from 500 MHz to 7 GHz, IIP2蚠 20 dBm and IIP3 蚠 3 dBm. The core circuit consumes only 16 mW from a 1.2 V supply voltage and occupies less than 0.01 mm蚠 in 65 nm CMOS.
    Original languageEnglish
    Article number10.1109/JSSC.2008.2004866
    Pages (from-to)2706-2715
    Number of pages10
    JournalIEEE journal of solid-state circuits
    Issue numberWP 08-02/12
    Publication statusPublished - 1 Dec 2008


    • EWI-14883
    • IR-65300
    • METIS-255121


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