The frequency response of SiGe HBT active mixers based on the Gilbert cell topology is analyzed theoretically. The time-varying operation of the active mixer is taken into account by applying conversion matrix analysis. The main bandwidth-limiting mechanisms experienced in SiGe HBT active mixers performing frequency conversion of wide-band signals is discussed. The analysis is verified by computer simulations using a realistic high-frequency large-signal SiGe HBT model. An active mixer design based on the Gilbert cell topology modified for wide-band operation using emitter degenerated transconductance stage and shunt feedback load stage is discussed. Experimental results are given for an active mixer implemented in a 0.8-μm 35-GHz fT SiGe HBT BiCMOS process.
|Journal||I E E E Transactions on Microwave Theory and Techniques|
|Publication status||Published - 2005|
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Johansen, T. K., Krozer, V., & Vidkjær, J. (2005). Analysis and Design of Wide-Band SiGe HBT Active Mixers. I E E E Transactions on Microwave Theory and Techniques, 53(7), 2389-2397. https://doi.org/10.1109/TMTT.2005.850421