Voltage generating circuit
US5534817A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Aug 18, 1994 |
| Grant date | Jul 9, 1996 |
| Priority date | — |
| Expiry date | Aug 18, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/262
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A voltage generating circuit for providing a prescribed voltage, such as 1/2V.sub.DD of the power source voltage V.sub.DD, wherein the capacity of the current and the response time of the voltage generating circuit is significantly improved. When the output voltage V.sub.OUT of the voltage generating circuit drops suddenly from a reference value 1/2V.sub.DD and goes below the lower limit of an allowable voltage level VM-, an n-type MOS transistor MN5A of an output voltage detecting circuit 14 turns on. The potential of the gate terminal for a p-type MOS transistor MP6A in a digital output circuit 16 is pulled to the level of the output voltage V.sub.OUT via the transistor MN5A that was turned on, and said p-type MOS transistor MP6A is turned on in the saturated area more or less perfectly. By virtue of a large amount of current flowing to the output side of a terminal side, namely the load circuit side, at an appropriate voltage from a power source terminal 18 via p-type MOS transistor MP6A which was turned on in the saturated area, a reduction in output voltage V.sub.OUT is stopped quickly and the output voltage is restored to the normal level within a short time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.