Real world MOSFETs have something called a body diode. In EC, the MOSFETs seem to have a body diode, but with strange characteristics. The body diode works when the gate and source are shorted, doesn't work when the gate is left open and becomes non-existent when the gate and drain are shorted. Also, the cut-in voltage of the EC body diode is equal to the gate-source threshold voltage!!
