Inverter function logic gate

摘要

A bipolar logic gate is provided which will perform logical operations involving the complement of one or more input signals. The gate resembles the conventional ECL OR/NOR gate circuit except that a level shift input transistor is substituted for the standard reference transistor and shifts the voltage level of the input signal whose complement is to be included in the logical operation. A voltage shift of about -0.4 volts occurs either at the base or on the emitter of the level shift input transistor. As a consequence of the voltage shift and subsequent comparison with unshifted voltages, the input voltages are compared with each other rather than with a reference voltage, VBB. Logically, the complement of the input is included in the OR'd and NOR'd outputs provided on the output lines. The logic gate may be incorporated in combinational and sequential logic circuits.