aaron_do
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Hi,
for question 1, from my understanding, the k-factor is used to represent unconditional stability. For a given port impedance, it does not necessarily mean that the circuit is unstable, it just means that there is some value of the port impedance which causes the circuit to be unstable. On the other hand, GT is the transducer power gain at the specific port impedance which is defined in the testbench. So perhaps the circuit is unstable at a port impedance where GT is more than 1.
Let me say however, that i'm not sure whether or not a circuit can be unstable (or not) when GT<1. It doesn't sound impossible though.
For question 2, I haven't seen that many technologies, but for the ones I have seen, there is not such a huge discrepancy between the minimum device length and that for RF transistors. Perhaps you are not looking at the right transistor.
cheers, Aaron
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