Abstract: A logic circuit uses an input Schottky diode of a first threshold and a clamp Schottky diode of a second threshold in combination with a high speed NPN switching transistor to form a simple high speed logic element. The novel use of two Schottky diodes of different threshold voltages provides a logic gate with a lower logic swing amenable with higher speed operation. Further, the operation of the logic gate is independent of the temperature characteristics of the NPN switching transistor. A PNP current source provides the drive current and load current for the logic gate in a simple manner which uses minimum chip area.