Inverter function logic gate
US4605871A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 1984 |
| Grant date | Aug 12, 1986 |
| Priority date | — |
| Expiry date | Mar 12, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/086
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A bipolar logic gate is provided which will perform logical operations involving the complement of one or more input signals. The gate resembles the conventional ECL OR/NOR gate circuit except that a level shift input transistor is substituted for the standard reference transistor and shifts the voltage level of the input signal whose complement is to be included in the logical operation. A voltage shift of about -0.4 volts occurs either at the base or on the emitter of the level shift input transistor. As a consequence of the voltage shift and subsequent comparison with unshifted voltages, the input voltages are compared with each other rather than with a reference voltage, V.sub.BB. Logically, the complement of the input is included in the OR'd and NOR'd outputs provided on the output lines. The logic gate may be incorporated in combinational and sequential logic circuits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.