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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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  • \$\begingroup\$ You have a very similar previous question - did you not understand the answer and decided to repost with a bit of a disguise? If you understand the answer given then please consider accepting that answer and explaining why this new question is different: electronics.stackexchange.com/questions/189962/… \$\endgroup\$
    – Andy aka
    Commented Sep 11, 2015 at 21:57

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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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