Which of the following combinations of logic gates can decode binary 1101?(a) One 4-input AND gate(b) One 4-input AND gate, one inverter(c) One 4-input AND gate, one OR gate(d) One 4-input NAND gate, one inverterThis question was posed to me in an interview.My doubt is from Combinational Circuits topic in section Combinational Circuits of Digital Circuits

Which of the following combinations of logic gates can decode binary 1

1.	Which of the following combinations of logic gates can decode binary 1101?(a) One 4-input AND gate(b) One 4-input AND gate, one inverter(c) One 4-input AND gate, one OR gate(d) One 4-input NAND gate, one inverterThis question was posed to me in an interview.My doubt is from Combinational Circuits topic in section Combinational Circuits of Digital Circuits
Answer» The correct CHOICE is (b) One 4-input AND gate, one inverter For explanation: For DECODING any number output must be high for that code and this is possible in One 4-input NAND gate, one inverter option only. A DECODER is a combinational circuit that converts binary DATA to n-coded data upto 2^n outputs.

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