Internal voltage generating circuit capable of generating variable multi-level voltages
US6404274B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 9, 1999 |
| Grant date | Jun 11, 2002 |
| Priority date | — |
| Expiry date | Apr 9, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/0025
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
There is provided an internal voltage generating circuit for outputting positive multi-level voltages by using a current addition type D/A conversion circuit, and suppressing increase of the pattern area of a resistor network even if the number of bits of a digital input increases. This circuit includes a load resistor element having one terminal connected to the output node of a voltage generating circuit, a first voltage setting circuit which is connected to a first node to which the other terminal of the load resistor element is connected and controls the magnitude of an input current from the load resistor element by controlling an equivalent resistor in accordance with digital data, a second voltage setting circuit which is connected to the first node and into which a predetermined current flows from the load resistor element, a potential comparison circuit for detecting a potential at the first node by comparing the potential at the first node with a reference potential, and a voltage control circuit for setting the potential at the first node to become equal to the reference potential by substantially controlling the voltage generating circuit in accordance with an output fr…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.