Analysis and design of wide-band SiGe HBT active mixers |
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| Authors: | Johansen TK Vidkjaer J Krozer V |
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| Affiliation: | Sect. of Electromagn. Syst., Tech. Univ. of Denmark, Lyngby, Denmark; |
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| Abstract: | 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-/spl mu/m 35-GHz f/sub T/ SiGe HBT BiCMOS process. |
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