I'm trying to find the Thevenin equivalent network for the circuit below.
But whenever I solve the equations, I always end up with V(t)=2V_a - 3i_s and can't get any expression showing V(t)~i(t) relationship. There's no way Thevenin resistance does not exist, but I can't get the grip of where i(t) appears..
I've tried short-circuit(V=0)/open-circuit(i=0) method along with putting test voltage between the terminals. The problem is that I can't get any expression that relates i(t) to V(t). Can somebody help me and find the v-i relationship for this circuit?
Thank you for reading my question.