higher immunity to noise and less sensitivity to parasitic elements application_number US 66902100 A description fig3 shows the schematic for the current mode logic gate 14 according to the invention which overcomes most of the problems discussed in the prior art on the input side the basic circuit is comprised of resistor 15 and transistors 17 and 18 additional inputs indicating by shadowed transistor 21 at input c can be provided by adding additional transistors in parallel with transistors 17 and 18 resistor 16 and transistor 19 provide a path for current to flow when both inputs a and b all inputs are inhibited the sources of all the transistors 17 19 and 21 are tied together and connected to a constant current source 20 in the schematic the power supply voltages are shown as v dd and v ss in this circuit v dd may be quite small for example 1 8 volts or less while the input voltage swings will typically range from 400 to 800 mvolts v ss is commonly operated at ground potential the current paths in the circuit are clearly seen to be through a resistor 15 transistor 17 and current source 20 and or b resistor 15 transistor 18 and current source 20 or c resistor 16 transistor 19 and current source 20 again resistor 16 and transistor 19 provide a path for current to flow when both input signals a and b are low 0 state at the very center of this invention is the way the gate of transistor 19 is controlled.