Title :
A new design for a lookahead carry generator
Author :
Kwan, Hercule ; Nelson, Robert Leonard, Jr. ; Swartzlander, Earl E., Jr.
Author_Institution :
Trimble Navigation, Austin, TX, USA
fDate :
31 Oct-2 Nov 1994
Abstract :
We propose a new scheme for the Texas Instruments SN54182/SN74182 lookahead-carry generator. The SN54182/SN74182 provides a redundant carry output, Cn+x. Our re-design provides an alternative to the original design that improves the performance of adder implementations. We analyze gate delays of lookahead adders with sizes of 16, 32 and 64 bits. The examine both CMOS-AISC vendor technology and standard TTL implementations, in all cases, gate delays of sum and carry bits are improved
Keywords :
CMOS logic circuits; adders; application specific integrated circuits; carry logic; delays; digital arithmetic; transistor-transistor logic; 16 bit; 32 bit; 64 bit; CMOS-AISC; Texas Instruments SN54182/SN74182; adder implementations; carry bits; gate delays; lookahead adders; lookahead carry generator; performance; re-design; redundant carry output; standard TTL implementations; sum bits; Added delay; Adders; Books; CMOS technology; Circuits; Drives; Equations; Instruments; Navigation; Pins;
Conference_Titel :
Signals, Systems and Computers, 1994. 1994 Conference Record of the Twenty-Eighth Asilomar Conference on
Conference_Location :
Pacific Grove, CA
Print_ISBN :
0-8186-6405-3
DOI :
10.1109/ACSSC.1994.471686
