Apparatus for and method of generation of ripple carry signals in conjunction with logical adding circuitry
US4439835A · kind A · utility
12Cited by
11References
3Claims
0Family size
Assignee
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Key dates
| Filing date | Jul 14, 1981 |
| Grant date | Mar 27, 1984 |
| Priority date | — |
| Expiry date | Jul 14, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F7/501
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A logical AND and logical OR gate are utilized in conjunction with two signals forming bits to be added for ascertaining the value of generate and propagate signals. The generate signal is passed to the output whenever the carry input is a logic zero and the propagate signal is supplied to the output whenever the carry signal is a logic one. This simplification of the approach to generating ripple carry signals substantially reduces the number of transistor to a value of about one-half that utilized in the prior art.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.