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4 marksLogic Gates

CAPE Physics Unit 2 · 2004 · Paper 2 · Question 7(a)(ii)

A circuit designed to switch an LED on and off from inputs A and B is shown in Figure 7a.

Construct the truth table for the circuit in Figure 7a and state whether or not the circuit will work.

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Other parts of this question

  1. 7(a)(i)Construct the truth tables for the AND gate and the Exclusive-OR (EX-OR) gate.[2 marks]
  2. 7(b)(i)Explain the operation of the Half-Adder.[3 marks]
  3. 7(b)(ii)Copy the waveforms A and B from Figure 7b into your answer booklet and carefully sketch the resulting output waveforms S and C directly underneath.[3 marks]
  4. 7(b)(iii)Draw a circuit to implement a Full-Adder using the half-adder circuit shown in Figure 7b, and explain its operation.[5 marks]
  5. 7(b)(iv)Determine the sum output, S, and carry output, C_out, for the Full-Adder inputs shown in Figure 7c.[3 marks]

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