Comparator using XNOR and XOR gates
US5391938A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 24, 1993 |
| Grant date | Feb 21, 1995 |
| Priority date | — |
| Expiry date | Nov 24, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F12/0895
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A comparator for comparing the voltages of an address pair signals in complement with the voltages of bit pair signals in complement includes a pair of transistors for receiving the bit pair signals and a pair of MOSFETs for receiving the address pair signals. One transistor and one MOSFET are connected in series to define a first current path and other transistor and other MOSFET are connected in series to define a second current path. When the address signal and the bit signal are the same, both the first and second current paths close, but when they are different, either the first or the second current path opens to permit a current to pass therethrough. By detecting the current in the path, the coincidence and non-coincidence between the address pair signals and bit pair signals are detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.