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Monolithic CMOS Direct-Conversion Mixer

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Monolithic CMOS Direct-Conversion Mixer

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    1. Monolithic CMOS Direct-Conversion Mixer Brian N. Limketkai Robert W. Brodersen Department of EECS University of California Berkeley

    2. Direct-Conversion Receiver Architecture

    3. The Contenders Passive Mixers Pros high linearity low power Cons conversion loss LO to RF feed-through may need LO buffer to drive switches Active Mixers Pros conversion gain good isolation between ports may add VGA capabilities Cons consumes power may need LO buffer may need common-mode feedback

    4. Passive CMOS Switching Mixer

    5. How Bad is the Conversion Loss?

    6. Active Gilbert Quad

    7. Variable Gain Capabilities

    8. Improving Linearity in the Gilbert Quad

    9. Future Work noise comparison between active and passive mixers linearity comparison check matching sensitivity layout

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