Title :
A 1.5 ns 32 b CMOS ALU in double pass-transistor logic
Author :
Suzuki, M. ; Ohkubo, N. ; Yamanaka, T. ; Shimizu, A. ; Sasaki, K.
Author_Institution :
Hitachi Ltd., Tokyo, Japan
Abstract :
A 32-b CMOS ALU (arithmetic and logic unit), fabricated using 0.25- mu m CMOS technology, that has a 1.5-ns addition time with a 2.5-V supply, is described. This addition time is achieved using double pass-transistor logic (DPL) and a conditional carry-selection (CCS) carry look-ahead circuit. The measured supply-voltage dependence of ALU addition time is shown, revealing excellent low-voltage performance. DPL AND/NAND and OR/NOR ring oscillators show measured speed improvements of 15% and 30% over CMOS NAND and NOR ring oscillators.<>
Keywords :
CMOS integrated circuits; carry logic; digital arithmetic; integrated logic circuits; 0.25 micron; 1.5 ns; 2.5 V; 32 bits; ALU; AND/NAND ring oscillators; CMOS ALU; OR/NOR ring oscillators; addition time; carry look-ahead circuit; conditional carry-selection; double pass-transistor logic; low-voltage performance; speed improvements; supply-voltage dependence; Adders; CMOS logic circuits; CMOS technology; Carbon capture and storage; Multiplexing; Page description languages; Ring oscillators; Semiconductor device measurement; Time measurement; Voltage;
Conference_Titel :
Solid-State Circuits Conference, 1993. Digest of Technical Papers. 40th ISSCC., 1993 IEEE International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-0987-1
DOI :
10.1109/ISSCC.1993.280071
