Effect of operating conditions on reverse gate current of junction f.e.t.s

With some types of nchannel junction f.e.t.s the measurement of gate leakage current under operating conditions (with a current flowing in the channel) has shown a very much higher value than would be expected from the maker´s specification of IGSS. The excess gate current which flows at higher channel voltage is proportional to the drain current and has a small negative temperature coefficient.