I understand that four-quadrant frequency mixers without transistors are difficult to implement. But what about two-quadrant? Would implementing mixers without transistors still be difficult? Would these mixers suffer from "threshold voltage" (if using diodes, maybe?) and one has to increase the physical size of the mixer?

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    – Andy aka
    Commented Sep 11, 2015 at 21:57

1 Answer 1


Some of the best performing mixers just use diodes and accurate transformers. (Double balanced mixer) to do four quadrant mixing.

They do have loss and need a lot of local oscillator drive but they are low noise so the overall noise figure can be pretty good.

Mini-Circuits is one of the most well known manufacturers (Mini-Circuits.


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