B what is the tpd for a 2bit carry lookahead adder

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Unformatted text preview: a two ­input gate is 5ns. a. What is the tpd for a 2 ­bit ripple carry adder? 4 ­bit ripple carry adder? b. What is the tpd for a 2 ­bit carry lookahead adder? 4 ­bit carry lookahead adder? c. How many logic gates are needed for a 2 ­bit ripple ­carry adder? 4 ­bit ripple ­carry adder? d. How many logic gates are needed for a 2 ­bit carry ­lookahead adder? 4 ­bit carry ­ lookahead adder? (Note: The 2 ­bit carry ­lookahead adder needs to include the logic for calculating C2.) e. What are the tradeoffs between the ripple ­ca...
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