Calibration techniques of active BiCMOS mixers

Kalle Kivekäs*, Aarno Pärssinen, Jussi Ryynänen, Jarkko Jussila, Kari Halonen

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    41 Citations (Scopus)

    Abstract

    This paper describes calibration techniques for downconversion mixers used in integrated direct-conversion receivers. A method of achieving a high even-order intermodulation rejection is presented. Using the method presented, the receiver second-order input intercept point (IIP2) can always be improved by more than 20 dB. The minimum achieved receiver IIP2 after calibration is +38 dBm. A technique to enhance the I/Q-amplitude balance between the quadrature channels is also introduced. A single-balanced adjustable mixer is implemented as a part of a prototype direct-conversion receiver. The receiver chip consists of a low-noise amplifier, mixers and calibration circuitry, a divide-by-two circuit, local oscillator (LO) buffers for LO generation, and active baseband filters. The chip is fabricated using a 0.35-μm SiGe BiCMOS process and is characterized at 900 MHz.

    Original languageEnglish
    Pages (from-to)766-769
    Number of pages4
    JournalIEEE Journal of Solid-State Circuits
    Volume37
    Issue number6
    DOIs
    Publication statusPublished - Jun 2002
    MoE publication typeA1 Journal article-refereed

    Keywords

    • BiCMOS analog integrated circuits
    • Calibration
    • Dc offset
    • Direct conversion
    • IIP2
    • Mixers
    • Radio receivers

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