RFICDUDE
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Barry Gilbert published a cool circuit for single ended input differential output mixer. He coined the overall circuit the "micromixer." The input stage is a combination common base (or equivalently common gate) for the inphase path and a current mirror turn around which acts sort of a common emitter (or common source) amp for the 180 degree path. The 180 split is not completly balanced at RF, but hardly any of the other techniques are either.
The MICROMIXER: a highly linear variant of the Gilbert mixer using a bisymmetric Class-AB input stage Gilbert, B. Solid-State Circuits, IEEE Journal of, Vol.32, Iss.9, Sep 1997 Pages:1412-1423
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