James Bond
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The lo amplitude should be large enough to switch the switches, but not too large. I have seen a similiar problem as you have , in my case ,the load resistors are too large, and it limited the ouput swing, at the same time, one of my switches is in triode state. two of them are turned off, only one is turned on. By the way, how do you know your switches are fully turned on/off.
In fact, your informations are not enough, it's better to post your simulation schematic and curve.
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