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PS01 - ECE 109 Spring 2010 Name Section Problem Session 1...

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ECE 109 Spring 2010 Name:__________________________________________ Section:______________________ Feb 1-5, 2010 1 Problem Session 1 1. [20 pts] For each CMOS circuit, fill in the corresponding truth table. These are NOT guaranteed to be legal CMOS logic gates. If any input combination produces an illegal or unknown output, put “X” for that output. A B C D 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1 A B D C A B C D 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1 A B C D A B C 0 0 0 1 1 0 1 1 A B C
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ECE 109 Spring 2010 Name:__________________________________________ Section:______________________ Feb 1-5, 2010 2 2. [20 points] Fill in the missing representations for the following numbers. You must show your work to get full credit. If a number cannot be represented using a particular scheme, write “none” and explain why no representation is possible. DO NOT use a calculator! decimal 10- bit two’s complement 10-bit sign-magnitude (a) 475 (b) 1110100100 (c) 0100000101 (d) -47 n 2 n 0 1 1 2 2 4 3 8 4 16 5 32 6 64 7 128 8 256 9 512 10 1024
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ECE 109 Spring 2010 Name:__________________________________________ Section:______________________ Feb 1-5, 2010 3 3. [10 pts] For the incomplete CMOS circuit below, complete the circuit to create a legal CMOS gate, and complete the truth table.
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