aaron_do
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Hi,
I think the second one is not typical. With the first, you can design a current-mode passive mixer which is very commonly used for its high linearity and robustness to variation.
For the second design, I'm not sure about the operating region. It seems like when the LO is high, M1 and M2 are in the saturation region with the LO connected to the drain. When the LO is low, the devices are still in the saturation region, but now the LO is connected to the source. You could try and simulate this to be sure, but anyway in this case, the linearity may not be good.
Anyway I'm not so sure, so you should run some simulations to find out.
cheers, Aaron
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