Digital Logic and Circuit Design Flashcards
6 cards from real B CompE Bachelor of Computer Engineering practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Digital Logic and Circuit Design flashcards as text
What does a decoder do in digital logic?
Answer: Converts binary input to one of many active output lines
A decoder takes an n-bit binary input and activates exactly one of 2^n output lines corresponding to the input value.
Which logic family is known for the fastest switching speed but highest power consumption?
Answer: ECL
ECL (Emitter-Coupled Logic) offers the highest switching speeds among standard logic families but consumes significantly more power.
What is the minimum number of NAND gates required to implement a NOT gate?
Answer: 1
A single NAND gate with both inputs tied together implements a NOT gate: NAND(A,A) = NOT A.
In digital electronics, what is a tristate buffer used for?
Answer: Allow multiple devices to share a common bus by disconnecting when inactive
A tristate buffer has three states (HIGH, LOW, high-impedance) and allows multiple outputs to be connected to a shared bus safely.
Which type of programmable logic device uses a fixed AND array and programmable OR array?
Answer: PAL (Programmable Array Logic)
A PAL (Programmable Array Logic) has a programmable AND array feeding a fixed OR array, offering simpler and faster implementation than a PLA.
What is the Boolean expression produced by applying De Morgan's theorem to NOT(A AND B)?
Answer: NOT A OR NOT B
De Morgan's theorem states that NOT(A AND B) = NOT A OR NOT B, allowing AND/OR gates to be swapped with complemented inputs.
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