A Recursive Carry-Lookahead/Carry-Select Hybrid Adder

The author presents a very fast adder for double-precision mantissas, which is an improvement on T. Lynch and E. E. Swartzlandes, Jr.'s spanning tree carry lookahead adder or redundant cell adder (see ibid., vol. 41, 1992) which was implemented using the Am29050 microprocessor. The adder presented is faster than theirs mainly because Manchester carry chains of various lengths are used instead of chains all of the same length. >

[1]  Vitit Kantabutra.  Accelerated Two-Level Carry-Skip Adders-A Type of Very Fast Adders , 1993, IEEE Trans. Computers.

[2]  Martine D. F. Schlag,et al.  Analysis and Design of CMOS Manchester Adders with Variable Carry-Skip , 1990, IEEE Trans. Computers.

[3]  Vitit Kantabutra.  Designing Optimum One-Level Carry-Skip Adders , 1993, IEEE Trans. Computers.

[4]  Silvio Turrini,et al.  Optimal group distribution in carry-skip adders , 1989, Proceedings of 9th Symposium on Computer Arithmetic.

[5]  Earl E. Swartzlander,et al.  The redundant cell adder , 1991, [1991] Proceedings 10th IEEE Symposium on Computer Arithmetic.

[6]  Vojin G. Oklobdzija,et al.  Some optimal schemes for ALU implementation in VLSI technology , 1985, 1985 IEEE 7th Symposium on Computer Arithmetic (ARITH).

[7]  Jean-Michel Muller,et al.  A Way to Build Efficient Carry-Skip Adders , 1987, IEEE Transactions on Computers.

[8]  Vojin G. Oklobdzija,et al.  Delay Optimization of Carry-Skip Adders and Block Carry-Lookahead Adders Using Multidimensional Dynamic Programming , 1992, IEEE Trans. Computers.

[9]  Marco Annaratone.  Digital CMOS Circuit Design , 1986 .

[10]  Ajay Naini,et al.  A 4.5 Ins 96b Cmos Adder Design , 1992, 1992 Proceedings of the IEEE Custom Integrated Circuits Conference.

[11]  M. Lehman,et al.  Skip Techniques for High-Speed Carry-Propagation in Binary Arithmetic Units , 1961, IRE Trans. Electron. Comput..

[12]  Keshab K. Parhi,et al.  A fast VLSI adder architecture , 1992 .

[13]  Vojin G. Oklobdzija,et al.  Delay optimization of carry-skip adders and block carry-lookahead adders , 1991, [1991] Proceedings 10th IEEE Symposium on Computer Arithmetic.

[14]  A. L. Fisher,et al.  Ultrafast compact 32-bit CMOS adders in multiple-output domino logic , 1989 .

[15]  Earl E. Swartzlander,et al.  A Spanning Tree Carry Lookahead Adder , 1992, IEEE Trans. Computers.