Balun combined amplifiers
Just wondering what kind of trouble could lie ahead when combining MMIC power amplifiers with external baluns. A low-loss balun has poor isolation... could this cause an oscillation? would it be a transient thing on startup and then die down or could it oscillate all the time? Does it matter that the amplifiers are already unconditionally stable? Asking for a friend...
If isolation doesn't matter in this case, why does it matter when you combine amplifiers in-phase or in quadrature?
I assume you are suggesting driving each side of the balanced end with the MMIC PAs,in which case I think you would have to drive them in anti-phase?
Yes that is what I was referring to. Thanks!
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