
: In negative logic, the logic state 1 corresponds to
A. Negative voltage
B. Zero voltage
C. More negative voltage
D. Lower voltage level
E. None of the above
Answer
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Hint:Recall the basics of a digital circuit in which different logic gates are used. Go through the meaning of the logic inputs 0 and 1 to the digital circuit. Then recall the working of a negative logic circuit and hence, determine that for the input 1 to a negative logic circuit, what is the output and what is the meaning of this output. Hence, choose the correct option.
Complete answer:
In the present question, we have asked the meaning of logic state 1 in a negative logic system.We know that there are various digital circuits used now-a-days.In a digital circuit, there are only two inputs and two outputs which are denoted by 0 and 1. Hence, these digital circuits are also known as the binary circuits.
We know that the logic state 1 in a digital circuit corresponds to the high voltage and the logic state 0 corresponds to the low voltage.The negative logic circuits are the circuits which reverse the input to its opposite value. This means that if the input is 0 then the output is 1 and if input is 1 then the output is 0.Thus, when the input to the negative logic circuit is 1 then the output must be zero.
The zero output in the digital system does not mean negative, zero or more negative voltage. The 0 output indicates that the output is lower than the input then the input may be whatever.Therefore, in negative logic, the logic state 1 corresponds to the output 1 with lower voltage level.
Hence, the correct option is D.
Note: The students may think that we have asked the meaning of the logic state 1 in a negative logic circuit. But the students should keep in mind that we have asked that if 1 is the input to the negative logic circuit then what should be the output of that negative logic circuit and what is the meaning of this output from the circuit.
Complete answer:
In the present question, we have asked the meaning of logic state 1 in a negative logic system.We know that there are various digital circuits used now-a-days.In a digital circuit, there are only two inputs and two outputs which are denoted by 0 and 1. Hence, these digital circuits are also known as the binary circuits.
We know that the logic state 1 in a digital circuit corresponds to the high voltage and the logic state 0 corresponds to the low voltage.The negative logic circuits are the circuits which reverse the input to its opposite value. This means that if the input is 0 then the output is 1 and if input is 1 then the output is 0.Thus, when the input to the negative logic circuit is 1 then the output must be zero.
The zero output in the digital system does not mean negative, zero or more negative voltage. The 0 output indicates that the output is lower than the input then the input may be whatever.Therefore, in negative logic, the logic state 1 corresponds to the output 1 with lower voltage level.
Hence, the correct option is D.
Note: The students may think that we have asked the meaning of the logic state 1 in a negative logic circuit. But the students should keep in mind that we have asked that if 1 is the input to the negative logic circuit then what should be the output of that negative logic circuit and what is the meaning of this output from the circuit.
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