MOSFET substrate current logic
US5939899A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 1997 |
| Grant date | Aug 17, 1999 |
| Priority date | — |
| Expiry date | Apr 23, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/0944
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Logic devices of the present invention have one or more MOSFETs that are configured to operate in logic circuits, where voltages applied to the source and drain of each MOSFET are treated as logic inputs to the circuit and the resulting substrate current is treated as the logic output of the circuit. In one implementation, a MOSFET is configured in a circuit to operate as an XOR gate where a load resistor between the substrate and ground converts the substrate current into an output voltage. A sample-and-hold circuit samples and holds the output voltage to isolate the XOR gate thereby allowing DC power dissipation to be reduced. In another implementation, three MOSFETs are configured to operate as an "ORNAND" logic device that performs the logical addition of the OR function and the NAND function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.