Tutorial 6 - Question 2: You have learnt how to construct a

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EE 2000 Logic Circuit Design, Semester A, 2007/08 Tutorial 6 Question 1: Figure below shows a simple locker. The output signal Z will be 1 when either 0, 1, 2, 3, 4, 5, 8, 9, A is entered form the hexadecimal keypad. Otherwise, Z is equal to 0. A 3 A 2 A 1 A 0 is a 4 digit binary number output from the keypad. Block A decodes these singals and output the signal Z . (a) Write down the truth table of Block A. (b) Find the simplest SOP and POS expression of Block A. (c) Design the circuit of Block A using minimum number of AND, OR and NOT gates.
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Unformatted text preview: Question 2: You have learnt how to construct a BCD-to-Excess-3-Code converter in last lecture. Now, instead of using two-level AND-OR circuit, construct (a) A BCD-to-Excess-3-Code converter using a 4-bit full adder only (b) An Excess-3-Code-to-BCD converter using a 4-bit full adder only Question 3: Find the output Boolean functions f 1 & f 2 for the circuit as shown in the following figure, and explain the operation of the circuit. f 1 f 2 a b c...
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This note was uploaded on 01/11/2011 for the course EE 2000 taught by Professor Vancwting during the Fall '07 term at City University of Hong Kong.

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