The source of the P-channeltransistor 12 is connected to a voltage rail 20 having a first voltage potential V.sub.H, and the source of the N-channel transistor 14 is connected to a voltage rail 22 having a second voltage potential V.sub.L, more negative than V.sub.H. Output node18 is connected to a current load 24.For the purposes of the present invention, a current load is an element or circuit c