Exclusive or gate circuit
US4626711A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 11, 1984 |
| Grant date | Dec 2, 1986 |
| Priority date | — |
| Expiry date | May 11, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/212
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An exclusive-or circuit which is extremely fast, uses lower power and fewer components, and is easier to manufacture than prior art circuits is achieved in a circuit which uses only a single reference voltage potential (shown as positive) in the portion of the circuit which generates exclusive-nor logic, and uses a feedback transistor to prevent saturation of a switching transistor. In the off state of the switching transistor, the single reference potential causes the base to be several saturation potentials above ground. In the on state, the feedback transistor reduces the base current. Thus the voltage swing between on and off states is less than in prior art circuits. In addition, the logic from many input signals can be combined to create a single exclusive-nor signal before buffering to an exclusive-or signal at the output terminal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.