2-33POSITIVE LOGICis defined as follows: If the signal that activates the circuit (the 1 state) has avoltage level that is more POSITIVE than the 0 state, then the logic polarity is considered to bePOSITIVE.NEGATIVE LOGICis defined as follows: If the signal that activates the circuit (the 1 state) has avoltage level that is more NEGATIVE than the 0 state, then the logic polarity is considered to beNEGATIVE.In DIGITAL LOGIC (positive or negative), the TRUE condition of a statement is represented bythe logic 1 state and the FALSE condition is represented by the logic 0 state.LOGIC LEVELSHigh and LOW represent the voltage levels of the two logic states. Logic levelHIGH represents the more positive voltage while logic level LOW represents the less positive (morenegative) voltage. In positive logic, the HIGH level corresponds to the TRUE or 1 state and the LOWlevel corresponds to the FALSE or 0 state. In negative logic, the HIGH level corresponds to the FALSEor 0 state and the LOW level corresponds to the TRUE or 1 state.A BOOLEAN EXPRESSION is a statement that represents the inputs and outputs of logic gates.The AND GATE requires all inputs to be HIGH at the same time in order to produce a HIGHoutput.The OR GATE requires one or both inputs to be HIGH in order to produce a HIGH output.INVERTER(NOT function or negator) is a logic gate used to complement the state of the inputvariable; that is, a 1 becomes a 0 or a 0 becomes a 1. It may be used on any input or output of any gate toobtain the desired result.

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