Patent ID: 6882179

Claim:
A method of fabricating a CMOS circuit comprising thick oxide transistors and thin oxide transistors by a fabrication process, said method comprising: fabricating a differential logic circuit having a plurality of thin oxide transistors, and having a plurality of logic inputs by the fabrication process; fabricating a current source, operable to supply bias current to the differential logic circuit, comprising at least one thick oxide transistor by the fabrication process and wherein the current source has a control input that can determine how much current is available to source to the differential logic circuit and further comprising an adaptive bias control coupled to at least one of the plurality of logic inputs that provides a control signal at the control input of the current source to increase the bias current available to the differential logic circuit; and providing said control signal at the control input of the current source to increase the bias current available to the differential logic circuit, said control signal being responsive to a voltage transition on the at least one logic input.