Patent · US Expired

Adder cell for carry-save arithmetic

US4893269A · kind A · utility

1Cited by

5References

3Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Karl Knauer · Gauting, DE
Winfried Kamp · Munich, DE

Key dates

Filing date	Mar 17, 1989
Grant date	Jan 9, 1990
Priority date	—
Expiry date	Mar 17, 2009

Classification

Technology area (CPC G)Physics
CPC primaryG06F7/501
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

An adder cell in which the sum signal and the carry signal are formed with equal speed is provided for employment in "carry-save" adders, wherein the sum signal and the carry signal are separately forwarded to separate inputs of following adder cells. The circuit of the adder cell is designed such that the sum signal as well as the carry signal each have to traverse only two gates, so that the running times of sum signal and carry signal are approximately identical and shorter than the maximum running time of conventional adder cells.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.