On the topology of FET circuits and the uniqueness of their dc operating points
Alan N. Willson · IEEE Transactions on Circuits and Systems · 1980
We show here how to prove several results which make it possible to deduce whether or not many common FET circuits can possess more than one, or only one, dc operating point, as a consequence of their topological structure alone. These results extend to FET circuits some similar results which have recently been proved for circuits containing bipolar transistors.